NEW COMPLEX COMPOUNDS WITH b-AMINOISOBUTYRIC ACID BIDENTATE LIGAND FOR POTENTIAL APPLICATION IN SUSTAINABLE AGRICULTURE (original) (raw)
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The binary complexes with the [M(Dhba)] − core and ternary complexes with [M(Dhba)(Nac)] 3 − core have been synthesized and characterized by physical and spectral analyses, where M is divalent metal (Mn 2 + , Co 2 + , Ni 2 + , Cu 2 + or Zn 2 + ) and Dhba and Nac are 2, 3-dihydroxybenzoic acid and N -acetylcysteine, respectively. The synthesized complexes are practical in biological applications since they are soluble in water. The synthesized complexes were found to possess enhanced antimicrobial activity, especially against Staphylococcus aureus , but reduced DPPH scavenging activity of Dhba. The binary and ternary complexes of Zn 2 + were shown to possess the most remarkable properties thus their structures were further examined. Thermodynamic properties of the Zn 2 + complexes in aqueous solution at various temperatures were also determined with an ionic strength of 0.15 mol/dm 3 NaCl. replenishment for living organisms . Moreover, Nac can form coordination compounds with metal ions . In this study, binary and ternary complexes including Dhba, Nac and some divalent metal ions such as Mn 2 + , Co 2 + , Ni 2 + , Cu 2 + and Zn 2 + were synthesized and characterized. The chelate complexes were initially characterized by FTIR and UV-vis spectroscopy analyses. Scavenging activity and antibacterial activity of the complexes were examined. Subsequently, binary and ternary complexes with high biological activity were further studied using elemental analysis, 1 H NMR and thermogravimetric analysis; their thermodynamic properties were also determined.
Applied Organometallic Chemistry, 2017
Manganese(II) complexes having the general composition Mn(L) 2 X 2 (where L = 3-bromoacetophenone semicarbazone, 3-bromoacetophenone thiosemicarbazone, 1-tetralone semicarbazone, 1-tetralone thiosemicarbazone, flavanone semicarbazone or flavanone thiosemicarbazone and X = Cl − or ½SO 4 2−) were synthesized. All the complexes were characterized using elemental analyses, molar conductance and magnetic moment measurements, and mass, 1 H NMR, infrared, electron paramagnetic resonance and electronic spectral studies. The molar conductance of the complexes in dimethylsulfoxide lies in the range 10-20 Ω −1 cm 2 mol −1 indicating their non-electrolytic nature. All the complexes show magnetic moments corresponding to five unpaired electrons.
Acta Periodica Technologica, 2005
Two new Mn(III) mixed-ligand complexes with two acetylacetonate (acac) ligands and one maleate ligand and its hydroxylamine derivative of the general formula [Mn(C 5 H 7 O 2 ) 2 L] were prepared. Their structure was established by using elemental analysis, FTIR and UV/VIS spectroscopic methods, as well as magnetic measurement. Replacement of the acetylacetonate ligand by the corresponding acid ligand has been confirmed in Mn(III) acetylacetonate. Based on the obtained experimental data and literature indications, structural formulae to these compounds were assigned.
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A series of binuclear acyclic polydentate complexes of Mn(II),Ni(II),and Cu(II) metal ions with the formula acyclic polydentate complexes of the formula [Mn 2 LCl 2 (H 2 O 4 )] and M=Ni(II), Mn(II) and Cu(II) have been prepared and characterized by 1 H, 13 C NMR,FTIR, UV-Visible spectroscopy and micro-elemental analysis, as well as the measurement of the magnetic moments of solid complexes and molar conductivity in DMSO solutions helped us to investigate the chemical structures of the new prepared complexes. The new acyclic poly dentate ligand 3,3'-(1E,1'E)-1,1'-(2,2'-azanediyl bis ylidene))bis(ethan-1-yl-1-(4-hydroxy-6-methyl-2H-pyran-2-one) was prepared from condensation of two moles of dehydroaceticacid with one mole of diethylenediaminetriamine(dien).The isolated free ligand have fully identified on the basis of (C.H.N) elemental analysis, 1 H, 13 C NMR , as well as FT- IR and UV-Visible spectroscopy.The antimicrobial a activity and itsMn(II), Ni(II),...
Journal of Thermal Analysis and Calorimetry, 2016
A thermal gravimetric analysis was studied for the new metal mixed-ligand complexes of copper(II), nickel(II), cobalt(II), and zinc(II) metals formed with glutamic acid as a primary ligand and nitrilotriacetic acid (H 3 NTA) as a secondary ligand which have been characterized by their elemental analysis, magneto-chemical measurements, Fourier transform infrared (FTIR), UV-Vis spectrophotometer, thermal gravimetric analysis, and mass spectroscopy studies. Glutamic acid in these complexes acts as a bidentate ligand, coordinating through the one nitrogen of the amino group and one oxygen of the carboxylate group, whereas nitrilotriacetic acid shows a tridentate nature, and the coordination occurs through two carboxylate oxygen and one nitrogen of the amino group. Water molecules satisfy the remaining coordination positions. The complexes have been suggested to show geometry of an octahedral symmetry. The results were indicated that the mixed complexes were isolated in 1:1:1 molar ratio (metal-glutamic-HNTA), and the molecular structures were suggested to be [M(glutamic)(HNTA) (H 2 O)]Á(2-1.5)H 2 O. The antimicrobial activities of our prepared complexes evaluated against Escherichia coli, Staphylococcus aureus, Candida albicans, and Aspergillus flavus (isolates from Micro-analytical Center, Faculty of Science, Cairo University) were investigated. Also, our prepared complexes were evaluated for their in vitro anticancer activity against hepatocellular carcinoma. In addition, the mass loss inhibition effects for copper and aluminum metal plates by our prepared complexes in 1 M HCl were studied.
New mixed ligand Complexes of Mn(II), Fe(II), Co(II), Ni(II), Zn(II), and Cd(II) with amino acids (L-proline and L-threonine) Cd(II) و Zn(II) ، Ni(II) ، Co (II) ، Fe(II) ، Mn(II) ل جديدة مختلطة ليكاندات معقدات Abstract A series of few mixed ligand complexes of, manganese(II),iron(II),cobalt(II), nickel(II), zinc (II) and cadmium(II), have been synthesized with The mixed ligand complexes have been characterized by, spectroscopic spectral measurements (FT-IR, U.V-Vis), molar conductance, magnetic measurements, and chloride content (Mohr Method) , metal contents of the complexes were determined by Atomic Absorption. The results suggest that the Mn(II), Fe(II), Co(II), Ni(II), Zn(II), and Cd(II) have distorted tetrahedral geometry. The following general formulae were proposed for the prepared complexes:[M (pro) (Thr)] , where pro-= C 5 H 8 NO 2-Thr= C 4 H 9 NO 2-, M +2 = Mn(II), Fe(II), Co(II), Ni(II), Zn(II), and Cd(II). Molar conductance of a 10 −3 M solution in (DMF) indicates that all the complexes are non-electrolytes.
Journal of Molecular Structure, 2011
Riboflavin (RF) complexes of Mg(II), Ca(II), Sr(II) and Ba(II) were successfully synthesized. Structures of metal complexes obtained were confirmed and characterized by elemental analysis, molar conductance, and infrared spectra. DC electrical conductivity measurements indicated that the alkaline earth metal (II) complexes of RF ligand are non-electrolytes. Elemental analysis of chelates suggest that the metal(II) ligand ratio is 1:2 with structure formula as [M(RF) 2 (X) 2 ]ÁnH 2 O. Infrared assignments clearly show that RF ligand coordinated as a bidentate feature through azomethine nitrogen of pyrazine ring and C@O of pyrimidine-2,4-dione. Thermal analyses of Mg(II), Ca(II), Sr(II) and Ba(II) complexes were investigated using (TG/DSC) under atmospheric nitrogen between 30 and 800°C. The surface morphology of the complexes was studied by SEM. The electrical conductivities of RF and its metal complexes were also measured with DC electrical conductivity in the temperature range from room to 483 K.
Bulletin of the Korean Chemical Society, 2013
A new series of Mn(II) and Mo(VI) complexes containing the Schiff bases hydrazinecarbothioamide and hydrazinecarboxamide of 5,6-dimethyl-1H-indol-2,3-dione have been synthesized.The nature of bonding and the stereochemistry of the complexes have been deduced from elemental analyses, molecular weight determinations and spectral studies viz. electronic IR, ESR, 1 H NMR and 13 C NMR and X-ray diffraction spectral studies. The magnetic moment values of the manganese(II) complexes are in the range of 5.80-6.15 B.M. suggesting a high spin state of manganese in these complexes. The spectral data are consistent with a tetrahedral geometry around Mn(II) and an octahedral geometry for Mo(VI), in which the ligands act as bidentate chelating agents, coordinated through the nitrogen and sulfur/oxygen atoms. The ligands and their metal complexes have been tested against a number of pathogenic fungi and bacteria at different concentrations and were found to possess sufficient fungicidal and bactericidal properties. Further, the complexes were also tested for their antifertility activity in male albino rats and the results were indeed positive.
Synthesis, Characterization, and Antibacterial effect of Complexes
The research includes the synthesis and identification of two types complexes of M+2 Ions using amino acid( L-leucin) and 8-hydroxyqinoline as ligands in general compositions [ M (Leu)2] and [ M (Q)2] were L-leucin (C6H13NO2)symbolized as (LeuH), and 8-hydroxyqinoline,(C9H7NO2) symbolized as (8-HQ) ,M(II) =Sn(II) and Pb(II), The ligand and metal ions were brought into reaction in ethanolic medium using (1:2) metal : ligand molar ratios as required. Products were found to be solid crystalline complexes, which have been Characterized through the following techniques: Melting points, Solubility, Molar conductivity. Determination the percentage of the metal in the complexes by (Atomic Absorption Spectrometry). chloride ion content were also evolution by (mohr method) . Spectroscopic Methods [FT-IR and UV-Vis]. The proposed structure of the complexes using program , chem office 3D(2006) .