Eduard Coropceanu - Academia.edu (original) (raw)
Papers by Eduard Coropceanu
It was theoretically studied the mechanism of the condensation reaction of 4-pyridinecarbo\-xalde... more It was theoretically studied the mechanism of the condensation reaction of 4-pyridinecarbo\-xaldehyde with o-, m- and p-aminobenzoic acids. Theoretical calculations represent a primary advantage in studying these reactions, along with the determination of a wide range of molecular properties. The studied reactions take place in two stages, each stage is accompanied by a transition state and for each stage it is calculated the activation energy. Thermodynamically speaking, all reactions are endothermic and the most convenient from an energetic point of view is the reaction for obtaining 4-(pyridine-3-yl-methylene amino) benzoic acid in methanol with an energy value of 9.98 kcal/mol.
In this article we aim to provide perspectives on learning strategies that have been activated fo... more In this article we aim to provide perspectives on learning strategies that have been activated for the effective training and development of entrepreneurial skills and the sense of initiative among students in the educational process of biology and chemistry through a transdisciplinary perspective. We as well put forward in the paper elements of originality from two perspectives: we suggest a set of characteristics of entrepreneurial competence and the sense of initiative among students and we argue that the formation and development of entrepreneurial competence and the sense of initiative is an evolutionary process that combines the dynamic exploitation of knowledge transdisciplinary learning.
Russian Journal of Coordination Chemistry, Dec 1, 2019
Single crystals of dianilineglyoxime (DAnH 2) in the form of hydrate salts [DAnH 3 ](ClO 4) • H 2... more Single crystals of dianilineglyoxime (DAnH 2) in the form of hydrate salts [DAnH 3 ](ClO 4) • H 2 O (I) and [DAnH 3 ](ClO 4) • 1.25H 2 O (II) are obtained. Three binuclear zinc(II) and manganese(II) compounds with dianilineglyoxime and 1,3-benzenedicarboxylic acid (1,3-Н 2 Bdc) are synthesized: [Zn 2 (DAnH 2) 2 (1,3-Bdc) 2 (DMF) 4 ] • 2DMF • MeOH • 1.5H 2 O (III), [Mn 2 (DAnH 2) 2 (1,3-Bdc) 2 (DMF) 4 ] • 2DMF (IV), and {[Mn 2 (DAnH 2) 2 (1,3-Bdc) 2 (DMF) 2 (CH 3 OH) 2 ][Mn 2 (DAnH 2) 2 (1,3-Bdc) 2 (DMF) 4 ] • 2CH 3 OH} (V). The compositions and structures of compounds I-V are confirmed by IR spectroscopy and X-ray diffraction analysis (CIF files CCDC nos. 1906360 (I), 1906362 (II), 1906361 (III), 1906363 (IV), and 1906364 (V)). The X-ray diffraction data show that DAnH 2 coordinates to the metal ions via the bidentate chelate mode, whereas (1,3-Вdc) 2coordinates to the metal ions via the bidentate bridging mode to form binuclear structures. As the most part of α-dioximes, one neutral DAnH 2 coordinates to each metal atom by two nitrogen atoms, whereas two (1,3-Вdc) 2anions coordinate to the metal atom by one oxygen atom each. The coordination polyhedra of the metals in compounds III-V are built up by the oxygen atoms of DMF and CH 3 OH.
Russian Journal of Coordination Chemistry, 2021
Seven compounds are synthesized by the reactions of the transition metals with rhodanine-3-acetic... more Seven compounds are synthesized by the reactions of the transition metals with rhodanine-3-acetic acid and studied by X-ray structure analysis. The compositions of the compounds can be presented by the formulas: [Co(Rda)2(H2O)4] (I), [Ni(Rda)2(H2O)4] (II), [Zn(Rda)2(H2O)4] (III), [Zn(5,5'-Rda-Rda)(Dmf)2(H2O)2]n (IV), [Co(Rda)2(bipy)(H2O)2]n (V), [Cd(Rda)2(Bpe)]n (VI), and [Co(Gly)3]⋅H2O (VII), where 5,5'-Rda-RdaН2 is the new ligand (condensation product of two RdaН molecules), bipy is 4,4-bipyridine, Bpe is bis(4-pyridyl)ethane, and Gly is glycine (CIF files CCDC nos. 2070334–2070339 for I–VI, respectively). Compounds I–III and VII are mononuclear molecular complexes, and compounds IV–VI are 1D coordination polymers. In complexes I–III, Rda coordinates via one oxygen atom of the carboxyl group as the monodeprotonated monodentate ligand, whereas in compound VII this ligand undergoes decomposition due to the solvothermal synthesis to form glycine molecules. Polymer IV is formed by the new ligand (5,5'-Rda-Rda)2– that coordinates as the bis(deprotonated) bidentate-bridging ligand, and molecules of the bis(pyridine) class (bipy and Bpе) act as bridging neutral ligands in compounds V and VI. In compound V, Rda coordinates as in complexes I–III, whereas in polymer VI two crystallographically independent Rda ligands coordinate via different modes: one ligand coordinates via the bidentate-chelating mode to one cadmium atom, and another coordinates via the tridentate-chelating mode to two metal atoms.
Russian Journal of Coordination Chemistry, 2021
Abstract Two new bis- and tris(solvatomorphs) [Ni(DAnH) 2 ]·0.25H 2 O ( I ) and [Ni(DAnH 2 ) 3 ]C... more Abstract Two new bis- and tris(solvatomorphs) [Ni(DAnH) 2 ]·0.25H 2 O ( I ) and [Ni(DAnH 2 ) 3 ]Cl 2 · 6CH 3 OH ( II ) are synthesized by the reaction of dianilineglyoxime (DAnH 2 ) with nickel(II) chloride under different conditions. The molecular structures of complexes I and II are determined by X-ray diffraction analysis (CIF files CCDC nos. 1998570 and 1998571, respectively). Complex I taken in optimally selected concentrations exerts the stimulation effect on the synthesis of proteases of the biotechnologically significant micromycete strain Fusarium gibbosum CNMN FD 12 increasing the activity of acidic proteases by 83.0% and that of neutral proteases by 68.2% compared to the control value. Complex I can be considered as a potential biostimulator of enzyme formation for some strains of mycelium fungi.
Russian Journal of Coordination Chemistry, Jul 1, 2017
The complexes [Zn(CH3COO)2(NioxH2)(DMF)(H2O)] (I), [Cd(CH3COO)2-(NioxH2)(DMF)(H2O)] (II), [Zn(CH3... more The complexes [Zn(CH3COO)2(NioxH2)(DMF)(H2O)] (I), [Cd(CH3COO)2-(NioxH2)(DMF)(H2O)] (II), [Zn(CH3COO)2(NioxH2)(S-Nia)(H2O)] · DMF (III), [Zn(CH3COO)2(NioxH2)(Nia)(H2O)] (IV), and [Zn(CH3COO)2(NioxH2)(INia)(H2O)] (V), where NioxH2 is 1,2-cyclohexanedione dioxime, S-Nia is thionicotinamide, Nia is nicotinamide, and INia is iso-nicotinamide, were prepared and investigated. Compounds I–III were studied by X-ray diffraction (CCDC nos. 1505280–1505282 for I–III, respectively). Testing of zinc complexes containing various ligands demonstrated that at the optimized concentration (5 mg/L), they can be used for stimulating biosynthesis of both standard (57.14%, pH 4.7) and acid-labile (17.63%, pH 2.5) amylases by the micromycete Aspergillus niger CNMN FD 06 without affecting the duration of producer culturing.
Russian Journal of Coordination Chemistry, Nov 1, 2013
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Acta Crystallographica Section E-structure Reports Online, Jul 13, 2013
Diaquabis(pyridine-2-carboxylato-κ 2 N,O)zinc dimethylformamide hemisolvate Lilia Croitor, Diana ... more Diaquabis(pyridine-2-carboxylato-κ 2 N,O)zinc dimethylformamide hemisolvate Lilia Croitor, Diana Chisca, Eduard B. Coropceanu and Marina S. Fonari S1. Comment Polydentate ligands such as pyridine-2-carboxylic acid (Hpic=picolinic acid) play important role in coordination chemistry and homogeneous catalysis. The combination of pyridyl and carboxyl groups in a single bridge-type ligand results in highly interconnected networks and gives limitless possibilities for increased network stability (Udvardy et al., 2013; Groni et al., 2008; Golenya et al. 2011). The COOgroup and the nitrogen atom in Hpic have strong coordination abilities and multiple coordination modes (Ma et al., 2009). Herein, we report the crystal structure of the title compound. supporting information sup-7
Russian Journal of Coordination Chemistry, Oct 1, 2011
The complexes [Co(DH)2(Seu)y(Se-Seu)z]2X · mSolv (DH is the dimethylglyoxime monoanion, Seu is se... more The complexes [Co(DH)2(Seu)y(Se-Seu)z]2X · mSolv (DH is the dimethylglyoxime monoanion, Seu is selenourea, and X is [TiF6]2−, [ZrF6]2−) were obtained from the system CoX · 6H2O-DH2-Seu in DMF-MeOH or MeOH-H2O and examined by UV, IR, and NMR spectroscopy and X-ray diffraction. Unexpectedly, the ligand Se-Seu (the oxidized form of selenourea) was detected on the axial coordinate, partially replacing selenourea. The complexes were formulated as [Co(DH)2(Seu)1.75(Se-Seu)0.25]2[TiF6] · H2O (I) and [Co(DH)2(Seu)(Se-Seu)]2[ZrF6] · 3H2O (II). The complex cations in I and II have trans-octahedral structures. Their crystal structures are made up of the complex Co3+ cations and the outer-sphere MF62− anions (M = Ti(IV) (I) and Zr(IV) (II)) held together by electrostatic interactions and hydrogen bonds; water of crystallization is also involved in hydrogen bonding.
Russian Journal of Coordination Chemistry, 2022
Abstract The reaction of dichloroglyoxime with sulfanilamide affords new glyoxime: disulfanilamid... more Abstract The reaction of dichloroglyoxime with sulfanilamide affords new glyoxime: disulfanilamide glyoxime (DsamH 2 , L). Two coordination compounds are synthesized from DsamH 2 : [Ni(DsamH) 2 ]·2H 2 O ( I ) and [Cu(DsamH 2 ) 3 ]SO 4 ·5H 2 O ( II ). Their compositions and structures are determined by elemental analysis and IR, UV, and NMR spectroscopy. Compounds L and II are studied by XRD (CIF files CCDC nos. 2080777 and 2080778, respectively). Both bis(ligand) and tris(ligand) complexes with L are synthesized depending on the synthesis conditions. The different degrees of deprotonation of the DsamH 2 ligand in complexes I and II cause the formation of both molecular and ionic complexes. Complex II taken in optimum concentrations exerts a stimulating effect on the protease synthesis of the biotechnologically significant micromycete strains Fusarium gibbosum CNMN FD 12 and Trichoderma koningii Oudemans CNMN FD 15.
Russian Journal of Coordination Chemistry, May 1, 2017
Three mononuclear different-ligand Zn(II) complexes, [Zn(CH 3 COO) 2 (PaoH) 2 ] (I), [Zn(PaoH) 2 ... more Three mononuclear different-ligand Zn(II) complexes, [Zn(CH 3 COO) 2 (PaoH) 2 ] (I), [Zn(PaoH) 2 (DMSO) 2 ][BF 4 ] 2 (II), and [Zn(NCS) 2 (PaoH) 2 ] (III) (DMSO = dimethylsulfoxide) were prepared by the reaction of zinc acetate and tetrafluoroborate with pyridine-2-aldoxime (PaoH). The composition and structure of the complexes were confirmed by IR spectroscopy and X-ray diffraction. All compounds crystallize in the monoclinic system, compounds I and II have space group P2 1 /n, while compound III has space group C2/c. In all compounds, the Zn coordination polyhedron is a distorted octahedron, which is formed by the N 4 O 2 sets of donor atoms in I and II and by N 6 in III. Complex I in the optimal concentration of 5-10 mg/L was found to stimulate the biosynthesis of standard (pH 4.7) amylases by the micromycete Aspergillus niger CNMN FD 06.
Related Article: Lilia Croitor , Eduard B. Coropceanu , Artem E. Masunov , Hector J. Rivera-Jacqu... more Related Article: Lilia Croitor , Eduard B. Coropceanu , Artem E. Masunov , Hector J. Rivera-Jacquez , Anatolii V. Siminel , Vyacheslav I. Zelentsov , Tatiana Ya. Datsko , and Marina S. Fonari|2014|Cryst.Growth Des.|14|3935|doi:10.1021/cg5005402
Acta Crystallographica Section A, Aug 22, 2011
Four new homochiral metal organic frameworks using amino acid derived links as a pure chiral prec... more Four new homochiral metal organic frameworks using amino acid derived links as a pure chiral precurser named, [Zn(l/d-Val-Py)(X)](H 2 O)(1-4), [X= Clˉ(1,3), Brˉ(2,4)] have been synthesized from aqueous media via solvothermal route and characterized by singlecrystal X-ray diffraction. Structural analysis reveals that a 3D MOF with a 1D channel in the direction of c-axis were formed having a pore aparture of ~13Å. All the structures form a rare zeolitic topology i.e unh type, which is not reported so far in the literature. The guest water molecule sits inside the 1D channel in a helical fashion and can be removed without affecting the crystal sturucture as revealed from TGA analysis. The anions used in these reaction systems (either from metal or ligand source) play a crucial role in formation of 3D structure. The structures with desired topology forms only when the ligand source is either pure l or d but in from the racemic. Applications of these chiral MOFs towards catalytic or chiral separations under process in our lab. Oweing to the importance of chiral MOFs for various applications as shown by Web lin et.al and others 1-3 , we believe that the successful synthesis of these four chiral MOFs form a easy chiral source like amino acids, will open up new vistas in the search for useful applications.
Inorganic Chemistry Communications, Oct 1, 2021
Abstract Four Cu(II)-based neutral coordination polymers, 1D {[Cu(isonia)2(adi)(dmf)].0.5H2adi}n ... more Abstract Four Cu(II)-based neutral coordination polymers, 1D {[Cu(isonia)2(adi)(dmf)].0.5H2adi}n (1), 2D {[Cu(isonia)2(adi)] (H2O.H2adi)}n (2), 1D {[Cu(pic)(CH3COO)(bpe)].H2O}n (3), and 2D [Cu2(pic)2(CH3COO)2(bpy)]n (4) with biocompatible molecules: isonicotinamide (isonia), pyridine-2-carboxylic (picolinic, Hpic) and adipic (H2adi) acids and 1,2-bis(4-pyridyl)-ethane (bpe) and 4,4’-bipyridine (bpy) as neutral linkers are reported. The polymer extension in 1 and 2 is reached via bidentate bridging adi anions with isonia ligands as single (1) and double (2) pillars. 1D and 2D coordination arrays are associated in elegant 3D H-bonded networks via interplay of robust amide(isonia)…amide(isonia) homosynthon and NH…O(COO-) side interactions. In 3 the pic residue coordinates in a chelate mode and forms the five-membered [Cu(pic)] corner fragment. The structure expansion occurs via bidentate-bridging bpe neutral linker registered in a coordination wire as different conformers thus providing long (Cu-bpe)6 crystallographically unique chain fragment. Oppositely, in 4 the pic residue acts in a bidentate chelate bridging mode and gives rise to the 2D coordination array. The bpy trapping between each two Cu(II) atoms, does not participate in further structure extension. The decisive impact of amido-group of isonia ligand in structure rigidification and retention of protic H2adi and water guest molecules is demonstrated. The gradual decrease of guest’s capacity correlates with an increased liphophilicity of 3 and 4 comparing with 1 and 2.
![Research paper thumbnail of Synthesis, Crystal and Molecular Structures of [Co(MH)2(Thio)2][BF4] · H2O and [Co(DH)2(NH3)2][BF4]](https://attachments.academia-assets.com/107808409/thumbnails/1.jpg)
](Russian Journal of Coordination Chemistry, May 1, 2004
Crystallography Reports, Sep 1, 2004
The crystal structure of a new mixed-ligand complex [Co(DH)(o-phen)2][BF4]2 · 2H2O is determined ... more The crystal structure of a new mixed-ligand complex [Co(DH)(o-phen)2][BF4]2 · 2H2O is determined by X-ray diffraction. The crystal is monoclinic, a = 12.2081(11) Å, b = 14.3474(9) Å, c = 17.7393(16) Å, β = 104.95(1)°, and space group P21/c. The coordination octahedron of Co3+ is formed by two nitrogen atoms of the dimethylglyoxime molecule and four nitrogen atoms of o-phenanthroline molecules. The dimethylglyoxime molecule is singly deprotonated and acts as DH−. The mean Co-N distances for dioxime and o-phenanthroline are 1.911 and 1.964 Å, respectively. The key role in the formation of the crystal structure is played by [BF4]− outer-sphere anions and crystallization water molecules, which form an extended hydrogen-bond system.
Russian Journal of Coordination Chemistry, Aug 1, 2016
Dedicated to the 110th anniversary of the discovery of the reaction of transition metals with α-d... more Dedicated to the 110th anniversary of the discovery of the reaction of transition metals with α-dioximes by Academician L.A. Chugaev and to the 110th birthday of Academician A.V. Ablov, the founder of the school of coordination chemistry in Chisinau
Journal of Structural Chemistry, Nov 1, 2007
Two new coordination compounds, trans-octahedral aniline-containing Co(III) dioximates [Co(DH)2(A... more Two new coordination compounds, trans-octahedral aniline-containing Co(III) dioximates [Co(DH)2(Anil)2]2[ZrF6]·2H2O (I) and [Co(NioxH)2(Anil)2]2[ZrF6]·3H2O (II), where DH− is the dimethylglyoxime monoanion, and NioxH− is the 1,2-cyclohexanedionedioxime monoanion, were synthesized, and their crystal structures were studied by XRD. In I, two centrosymmetric, crystallographically independent [Co(DH)2(Anil)2]+ complex cations (A and B) are linked by a system of hydrogen bonds, the [ZrF6]2− centrosymmetric anion, and
Inorganica Chimica Acta, May 1, 2011
Interaction of cadmium(II) or zinc(II) acetate with 1,2-bis(4-pyridyl)ethane (bpe) in the presenc... more Interaction of cadmium(II) or zinc(II) acetate with 1,2-bis(4-pyridyl)ethane (bpe) in the presence of dioxime(1,2-cyclohexanedionedioxime=NioxH2 or diphenylglyoxime=dpgH2) resulted in three complexes with the compositions [Cd2(CH3COO)4(NioxH2)2(bpe)(H2O)2] (1), [Cd(CH3COO)2(bpe)(H2O)]n (2) and [Zn(CH3COO)2(NioxH2)(bpe)(H2O)]n (3), which were characterized by single-crystal X-ray diffraction, elemental analysis, IR, and luminescence spectroscopy. Dioxime-containing binuclear molecule 1 and 1D linear polymer 3 possess moderate luminescence properties, while the dioxime-free 1D
It was theoretically studied the mechanism of the condensation reaction of 4-pyridinecarbo\-xalde... more It was theoretically studied the mechanism of the condensation reaction of 4-pyridinecarbo\-xaldehyde with o-, m- and p-aminobenzoic acids. Theoretical calculations represent a primary advantage in studying these reactions, along with the determination of a wide range of molecular properties. The studied reactions take place in two stages, each stage is accompanied by a transition state and for each stage it is calculated the activation energy. Thermodynamically speaking, all reactions are endothermic and the most convenient from an energetic point of view is the reaction for obtaining 4-(pyridine-3-yl-methylene amino) benzoic acid in methanol with an energy value of 9.98 kcal/mol.
In this article we aim to provide perspectives on learning strategies that have been activated fo... more In this article we aim to provide perspectives on learning strategies that have been activated for the effective training and development of entrepreneurial skills and the sense of initiative among students in the educational process of biology and chemistry through a transdisciplinary perspective. We as well put forward in the paper elements of originality from two perspectives: we suggest a set of characteristics of entrepreneurial competence and the sense of initiative among students and we argue that the formation and development of entrepreneurial competence and the sense of initiative is an evolutionary process that combines the dynamic exploitation of knowledge transdisciplinary learning.
Russian Journal of Coordination Chemistry, Dec 1, 2019
Single crystals of dianilineglyoxime (DAnH 2) in the form of hydrate salts [DAnH 3 ](ClO 4) • H 2... more Single crystals of dianilineglyoxime (DAnH 2) in the form of hydrate salts [DAnH 3 ](ClO 4) • H 2 O (I) and [DAnH 3 ](ClO 4) • 1.25H 2 O (II) are obtained. Three binuclear zinc(II) and manganese(II) compounds with dianilineglyoxime and 1,3-benzenedicarboxylic acid (1,3-Н 2 Bdc) are synthesized: [Zn 2 (DAnH 2) 2 (1,3-Bdc) 2 (DMF) 4 ] • 2DMF • MeOH • 1.5H 2 O (III), [Mn 2 (DAnH 2) 2 (1,3-Bdc) 2 (DMF) 4 ] • 2DMF (IV), and {[Mn 2 (DAnH 2) 2 (1,3-Bdc) 2 (DMF) 2 (CH 3 OH) 2 ][Mn 2 (DAnH 2) 2 (1,3-Bdc) 2 (DMF) 4 ] • 2CH 3 OH} (V). The compositions and structures of compounds I-V are confirmed by IR spectroscopy and X-ray diffraction analysis (CIF files CCDC nos. 1906360 (I), 1906362 (II), 1906361 (III), 1906363 (IV), and 1906364 (V)). The X-ray diffraction data show that DAnH 2 coordinates to the metal ions via the bidentate chelate mode, whereas (1,3-Вdc) 2coordinates to the metal ions via the bidentate bridging mode to form binuclear structures. As the most part of α-dioximes, one neutral DAnH 2 coordinates to each metal atom by two nitrogen atoms, whereas two (1,3-Вdc) 2anions coordinate to the metal atom by one oxygen atom each. The coordination polyhedra of the metals in compounds III-V are built up by the oxygen atoms of DMF and CH 3 OH.
Russian Journal of Coordination Chemistry, 2021
Seven compounds are synthesized by the reactions of the transition metals with rhodanine-3-acetic... more Seven compounds are synthesized by the reactions of the transition metals with rhodanine-3-acetic acid and studied by X-ray structure analysis. The compositions of the compounds can be presented by the formulas: [Co(Rda)2(H2O)4] (I), [Ni(Rda)2(H2O)4] (II), [Zn(Rda)2(H2O)4] (III), [Zn(5,5'-Rda-Rda)(Dmf)2(H2O)2]n (IV), [Co(Rda)2(bipy)(H2O)2]n (V), [Cd(Rda)2(Bpe)]n (VI), and [Co(Gly)3]⋅H2O (VII), where 5,5'-Rda-RdaН2 is the new ligand (condensation product of two RdaН molecules), bipy is 4,4-bipyridine, Bpe is bis(4-pyridyl)ethane, and Gly is glycine (CIF files CCDC nos. 2070334–2070339 for I–VI, respectively). Compounds I–III and VII are mononuclear molecular complexes, and compounds IV–VI are 1D coordination polymers. In complexes I–III, Rda coordinates via one oxygen atom of the carboxyl group as the monodeprotonated monodentate ligand, whereas in compound VII this ligand undergoes decomposition due to the solvothermal synthesis to form glycine molecules. Polymer IV is formed by the new ligand (5,5'-Rda-Rda)2– that coordinates as the bis(deprotonated) bidentate-bridging ligand, and molecules of the bis(pyridine) class (bipy and Bpе) act as bridging neutral ligands in compounds V and VI. In compound V, Rda coordinates as in complexes I–III, whereas in polymer VI two crystallographically independent Rda ligands coordinate via different modes: one ligand coordinates via the bidentate-chelating mode to one cadmium atom, and another coordinates via the tridentate-chelating mode to two metal atoms.
Russian Journal of Coordination Chemistry, 2021
Abstract Two new bis- and tris(solvatomorphs) [Ni(DAnH) 2 ]·0.25H 2 O ( I ) and [Ni(DAnH 2 ) 3 ]C... more Abstract Two new bis- and tris(solvatomorphs) [Ni(DAnH) 2 ]·0.25H 2 O ( I ) and [Ni(DAnH 2 ) 3 ]Cl 2 · 6CH 3 OH ( II ) are synthesized by the reaction of dianilineglyoxime (DAnH 2 ) with nickel(II) chloride under different conditions. The molecular structures of complexes I and II are determined by X-ray diffraction analysis (CIF files CCDC nos. 1998570 and 1998571, respectively). Complex I taken in optimally selected concentrations exerts the stimulation effect on the synthesis of proteases of the biotechnologically significant micromycete strain Fusarium gibbosum CNMN FD 12 increasing the activity of acidic proteases by 83.0% and that of neutral proteases by 68.2% compared to the control value. Complex I can be considered as a potential biostimulator of enzyme formation for some strains of mycelium fungi.
Russian Journal of Coordination Chemistry, Jul 1, 2017
The complexes [Zn(CH3COO)2(NioxH2)(DMF)(H2O)] (I), [Cd(CH3COO)2-(NioxH2)(DMF)(H2O)] (II), [Zn(CH3... more The complexes [Zn(CH3COO)2(NioxH2)(DMF)(H2O)] (I), [Cd(CH3COO)2-(NioxH2)(DMF)(H2O)] (II), [Zn(CH3COO)2(NioxH2)(S-Nia)(H2O)] · DMF (III), [Zn(CH3COO)2(NioxH2)(Nia)(H2O)] (IV), and [Zn(CH3COO)2(NioxH2)(INia)(H2O)] (V), where NioxH2 is 1,2-cyclohexanedione dioxime, S-Nia is thionicotinamide, Nia is nicotinamide, and INia is iso-nicotinamide, were prepared and investigated. Compounds I–III were studied by X-ray diffraction (CCDC nos. 1505280–1505282 for I–III, respectively). Testing of zinc complexes containing various ligands demonstrated that at the optimized concentration (5 mg/L), they can be used for stimulating biosynthesis of both standard (57.14%, pH 4.7) and acid-labile (17.63%, pH 2.5) amylases by the micromycete Aspergillus niger CNMN FD 06 without affecting the duration of producer culturing.
Russian Journal of Coordination Chemistry, Nov 1, 2013
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Acta Crystallographica Section E-structure Reports Online, Jul 13, 2013
Diaquabis(pyridine-2-carboxylato-κ 2 N,O)zinc dimethylformamide hemisolvate Lilia Croitor, Diana ... more Diaquabis(pyridine-2-carboxylato-κ 2 N,O)zinc dimethylformamide hemisolvate Lilia Croitor, Diana Chisca, Eduard B. Coropceanu and Marina S. Fonari S1. Comment Polydentate ligands such as pyridine-2-carboxylic acid (Hpic=picolinic acid) play important role in coordination chemistry and homogeneous catalysis. The combination of pyridyl and carboxyl groups in a single bridge-type ligand results in highly interconnected networks and gives limitless possibilities for increased network stability (Udvardy et al., 2013; Groni et al., 2008; Golenya et al. 2011). The COOgroup and the nitrogen atom in Hpic have strong coordination abilities and multiple coordination modes (Ma et al., 2009). Herein, we report the crystal structure of the title compound. supporting information sup-7
Russian Journal of Coordination Chemistry, Oct 1, 2011
The complexes [Co(DH)2(Seu)y(Se-Seu)z]2X · mSolv (DH is the dimethylglyoxime monoanion, Seu is se... more The complexes [Co(DH)2(Seu)y(Se-Seu)z]2X · mSolv (DH is the dimethylglyoxime monoanion, Seu is selenourea, and X is [TiF6]2−, [ZrF6]2−) were obtained from the system CoX · 6H2O-DH2-Seu in DMF-MeOH or MeOH-H2O and examined by UV, IR, and NMR spectroscopy and X-ray diffraction. Unexpectedly, the ligand Se-Seu (the oxidized form of selenourea) was detected on the axial coordinate, partially replacing selenourea. The complexes were formulated as [Co(DH)2(Seu)1.75(Se-Seu)0.25]2[TiF6] · H2O (I) and [Co(DH)2(Seu)(Se-Seu)]2[ZrF6] · 3H2O (II). The complex cations in I and II have trans-octahedral structures. Their crystal structures are made up of the complex Co3+ cations and the outer-sphere MF62− anions (M = Ti(IV) (I) and Zr(IV) (II)) held together by electrostatic interactions and hydrogen bonds; water of crystallization is also involved in hydrogen bonding.
Russian Journal of Coordination Chemistry, 2022
Abstract The reaction of dichloroglyoxime with sulfanilamide affords new glyoxime: disulfanilamid... more Abstract The reaction of dichloroglyoxime with sulfanilamide affords new glyoxime: disulfanilamide glyoxime (DsamH 2 , L). Two coordination compounds are synthesized from DsamH 2 : [Ni(DsamH) 2 ]·2H 2 O ( I ) and [Cu(DsamH 2 ) 3 ]SO 4 ·5H 2 O ( II ). Their compositions and structures are determined by elemental analysis and IR, UV, and NMR spectroscopy. Compounds L and II are studied by XRD (CIF files CCDC nos. 2080777 and 2080778, respectively). Both bis(ligand) and tris(ligand) complexes with L are synthesized depending on the synthesis conditions. The different degrees of deprotonation of the DsamH 2 ligand in complexes I and II cause the formation of both molecular and ionic complexes. Complex II taken in optimum concentrations exerts a stimulating effect on the protease synthesis of the biotechnologically significant micromycete strains Fusarium gibbosum CNMN FD 12 and Trichoderma koningii Oudemans CNMN FD 15.
Russian Journal of Coordination Chemistry, May 1, 2017
Three mononuclear different-ligand Zn(II) complexes, [Zn(CH 3 COO) 2 (PaoH) 2 ] (I), [Zn(PaoH) 2 ... more Three mononuclear different-ligand Zn(II) complexes, [Zn(CH 3 COO) 2 (PaoH) 2 ] (I), [Zn(PaoH) 2 (DMSO) 2 ][BF 4 ] 2 (II), and [Zn(NCS) 2 (PaoH) 2 ] (III) (DMSO = dimethylsulfoxide) were prepared by the reaction of zinc acetate and tetrafluoroborate with pyridine-2-aldoxime (PaoH). The composition and structure of the complexes were confirmed by IR spectroscopy and X-ray diffraction. All compounds crystallize in the monoclinic system, compounds I and II have space group P2 1 /n, while compound III has space group C2/c. In all compounds, the Zn coordination polyhedron is a distorted octahedron, which is formed by the N 4 O 2 sets of donor atoms in I and II and by N 6 in III. Complex I in the optimal concentration of 5-10 mg/L was found to stimulate the biosynthesis of standard (pH 4.7) amylases by the micromycete Aspergillus niger CNMN FD 06.
Related Article: Lilia Croitor , Eduard B. Coropceanu , Artem E. Masunov , Hector J. Rivera-Jacqu... more Related Article: Lilia Croitor , Eduard B. Coropceanu , Artem E. Masunov , Hector J. Rivera-Jacquez , Anatolii V. Siminel , Vyacheslav I. Zelentsov , Tatiana Ya. Datsko , and Marina S. Fonari|2014|Cryst.Growth Des.|14|3935|doi:10.1021/cg5005402
Acta Crystallographica Section A, Aug 22, 2011
Four new homochiral metal organic frameworks using amino acid derived links as a pure chiral prec... more Four new homochiral metal organic frameworks using amino acid derived links as a pure chiral precurser named, [Zn(l/d-Val-Py)(X)](H 2 O)(1-4), [X= Clˉ(1,3), Brˉ(2,4)] have been synthesized from aqueous media via solvothermal route and characterized by singlecrystal X-ray diffraction. Structural analysis reveals that a 3D MOF with a 1D channel in the direction of c-axis were formed having a pore aparture of ~13Å. All the structures form a rare zeolitic topology i.e unh type, which is not reported so far in the literature. The guest water molecule sits inside the 1D channel in a helical fashion and can be removed without affecting the crystal sturucture as revealed from TGA analysis. The anions used in these reaction systems (either from metal or ligand source) play a crucial role in formation of 3D structure. The structures with desired topology forms only when the ligand source is either pure l or d but in from the racemic. Applications of these chiral MOFs towards catalytic or chiral separations under process in our lab. Oweing to the importance of chiral MOFs for various applications as shown by Web lin et.al and others 1-3 , we believe that the successful synthesis of these four chiral MOFs form a easy chiral source like amino acids, will open up new vistas in the search for useful applications.
Inorganic Chemistry Communications, Oct 1, 2021
Abstract Four Cu(II)-based neutral coordination polymers, 1D {[Cu(isonia)2(adi)(dmf)].0.5H2adi}n ... more Abstract Four Cu(II)-based neutral coordination polymers, 1D {[Cu(isonia)2(adi)(dmf)].0.5H2adi}n (1), 2D {[Cu(isonia)2(adi)] (H2O.H2adi)}n (2), 1D {[Cu(pic)(CH3COO)(bpe)].H2O}n (3), and 2D [Cu2(pic)2(CH3COO)2(bpy)]n (4) with biocompatible molecules: isonicotinamide (isonia), pyridine-2-carboxylic (picolinic, Hpic) and adipic (H2adi) acids and 1,2-bis(4-pyridyl)-ethane (bpe) and 4,4’-bipyridine (bpy) as neutral linkers are reported. The polymer extension in 1 and 2 is reached via bidentate bridging adi anions with isonia ligands as single (1) and double (2) pillars. 1D and 2D coordination arrays are associated in elegant 3D H-bonded networks via interplay of robust amide(isonia)…amide(isonia) homosynthon and NH…O(COO-) side interactions. In 3 the pic residue coordinates in a chelate mode and forms the five-membered [Cu(pic)] corner fragment. The structure expansion occurs via bidentate-bridging bpe neutral linker registered in a coordination wire as different conformers thus providing long (Cu-bpe)6 crystallographically unique chain fragment. Oppositely, in 4 the pic residue acts in a bidentate chelate bridging mode and gives rise to the 2D coordination array. The bpy trapping between each two Cu(II) atoms, does not participate in further structure extension. The decisive impact of amido-group of isonia ligand in structure rigidification and retention of protic H2adi and water guest molecules is demonstrated. The gradual decrease of guest’s capacity correlates with an increased liphophilicity of 3 and 4 comparing with 1 and 2.
Russian Journal of Coordination Chemistry, May 1, 2004
Crystallography Reports, Sep 1, 2004
The crystal structure of a new mixed-ligand complex [Co(DH)(o-phen)2][BF4]2 · 2H2O is determined ... more The crystal structure of a new mixed-ligand complex [Co(DH)(o-phen)2][BF4]2 · 2H2O is determined by X-ray diffraction. The crystal is monoclinic, a = 12.2081(11) Å, b = 14.3474(9) Å, c = 17.7393(16) Å, β = 104.95(1)°, and space group P21/c. The coordination octahedron of Co3+ is formed by two nitrogen atoms of the dimethylglyoxime molecule and four nitrogen atoms of o-phenanthroline molecules. The dimethylglyoxime molecule is singly deprotonated and acts as DH−. The mean Co-N distances for dioxime and o-phenanthroline are 1.911 and 1.964 Å, respectively. The key role in the formation of the crystal structure is played by [BF4]− outer-sphere anions and crystallization water molecules, which form an extended hydrogen-bond system.
Russian Journal of Coordination Chemistry, Aug 1, 2016
Dedicated to the 110th anniversary of the discovery of the reaction of transition metals with α-d... more Dedicated to the 110th anniversary of the discovery of the reaction of transition metals with α-dioximes by Academician L.A. Chugaev and to the 110th birthday of Academician A.V. Ablov, the founder of the school of coordination chemistry in Chisinau
Journal of Structural Chemistry, Nov 1, 2007
Two new coordination compounds, trans-octahedral aniline-containing Co(III) dioximates [Co(DH)2(A... more Two new coordination compounds, trans-octahedral aniline-containing Co(III) dioximates [Co(DH)2(Anil)2]2[ZrF6]·2H2O (I) and [Co(NioxH)2(Anil)2]2[ZrF6]·3H2O (II), where DH− is the dimethylglyoxime monoanion, and NioxH− is the 1,2-cyclohexanedionedioxime monoanion, were synthesized, and their crystal structures were studied by XRD. In I, two centrosymmetric, crystallographically independent [Co(DH)2(Anil)2]+ complex cations (A and B) are linked by a system of hydrogen bonds, the [ZrF6]2− centrosymmetric anion, and
Inorganica Chimica Acta, May 1, 2011
Interaction of cadmium(II) or zinc(II) acetate with 1,2-bis(4-pyridyl)ethane (bpe) in the presenc... more Interaction of cadmium(II) or zinc(II) acetate with 1,2-bis(4-pyridyl)ethane (bpe) in the presence of dioxime(1,2-cyclohexanedionedioxime=NioxH2 or diphenylglyoxime=dpgH2) resulted in three complexes with the compositions [Cd2(CH3COO)4(NioxH2)2(bpe)(H2O)2] (1), [Cd(CH3COO)2(bpe)(H2O)]n (2) and [Zn(CH3COO)2(NioxH2)(bpe)(H2O)]n (3), which were characterized by single-crystal X-ray diffraction, elemental analysis, IR, and luminescence spectroscopy. Dioxime-containing binuclear molecule 1 and 1D linear polymer 3 possess moderate luminescence properties, while the dioxime-free 1D