Manganese(II) complexes of 3,6,9-trioxaundecanedioic acid (3,6,9-tddaH2): X-ray crystal structures of [Mn(3,6,9-tdda) (H2O)2]·2H2O and {[Mn(3,6,9-tdda)(phen)2·3H2O]·EtOH}n (original) (raw)
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Transition Metal Chemistry, 2000
New manganese(II) complexes with ethylenediamine-N,N,N',N'-tetra-3-propionate (edtp) and 1,2-propanediamine-N,N,N',N'-tetraacetate (1,2-pdta) were prepared and characterized by elemental analysis, i.r. spectroscopy and magnetic measurements. The structure of [Mn(H21,2-pdta)(H2O] · 3H2O was determined by the single crystal X-ray diffraction technique. The complex crystallizes in the space group P21/n(#14) of the monoclinic crystal system with unit cell parameters a = 10.993(2) Å, b = 14.092(2)
Journal of the Chemical Society, Dalton Transactions, 1997
A number of manganese() complexes of tetradentate N 2 O 2 Schiff-base ligands have been prepared with various additional carboxylate anions. Five of these compounds have been crystallographically characterised revealing that a remarkable array of structural chemistry is available. A polymeric species is observed for [{Mn(saltn)(O 2 CEt)} n ] 1, whereas a monomeric species is found in [Mn(saltn)(O 2 CBu t )] 2 [H 2 saltn = N,NЈbis(salicylidene)trimethylenediamine]. The anti-anti bridging of the manganese centres in 1 is in contrast to that in [{Mn(bsaltn)(O 2 CCH 2 Ph)} 2n ] 3 (H 2 bsaltn = 5-bromo derivative of H 2 saltn), which exhibits rare syn-anti bridging; 3 also contains a dimeric repeat unit due to an alternate 180Њ twist in the polymeric chain necessitated by steric constraints. In contrast, the complexes containing the dianion of N,NЈ-bis(3-methoxysalicylidene)ethane-1,2diamine (H 2 msalen) appear to be isostructural, [{Mn(msalen)(O 2 CEt)} 2 ]ؒEtOH 4 and [{Mn(msalen)(O 2 CBu n )} 2 ] 5 being structurally characterised as essentially identical phenoxy-bridged dimers. An insoluble material of stoichiometry Mn 4 (O 2 CR) 3 (saltn) 3 (H 2 O) n (n = 0-3) was isolated from all reactions involving the saltn ligand; attempts to characterise these compounds by X-ray diffraction have been unsuccessful. However, the previously characterised manganese() dimer [{Mn(saltn)O} 2 ]ؒ2dmf 6 (dmf = dimethylformamide) and the monomeric species [Mn(saltn)(O 2 CEt)] 7 were isolated in attempts to crystallise these materials.
Journal of the Chemical Society, Dalton Transactions, 2001
Thermodynamic and structural aspects of manganese(II) complexes with polyaminopolycarboxylic ligands based upon 1,4,7,10tetraazacyclododecane (cyclen). Crystal structure of dimeric [MnL] 2 ؒ2CH 3 OH containing the new ligand 1,4,7,10-tetraazacyclododecane-1,4-diacetate
Mononuclear manganese carboxylate complexes: Synthesis and structural studies
Polyhedron, 2006
Several manganese carboxylates complexes having Pz iPr2 H (3,5-diisopropylpyrazole), Tp Ph,Me (hydrotris(3-phenyl,5-methyl-pyrazol-1-yl)borate), Tp ipr2 (hydrotris(3,5-diisopropyl-pyrazol-1-yl)borate) as supporting ligands have been synthesised and structurally characterized. Single-crystal X-ray diffraction studies suggest that the manganese center in complexes (Pz iPr2 H) 4 Mn(NO 2 -OBz) 2 (5) and (Pz iPr2 H) 4 Mn(F-OBz) 2 (6) have same coordination environment and geometry whereas the complex [Tp Ph,Me Mn(OAc)Pz Ph,Me H] (7) has a five coordinate manganese center. In all these complexes, the carboxylate groups are coordinated as monodentate and the uncoordinated oxygen atom of the carboxylate groups form intramolecular hydrogen bonds with the NH group of the corresponding coordinated pyrazole (Pz iPr2 H/Pz Ph,Me H). The complexes 5-8 and 10 were tested for their superoxide dismutase activity and it was found that only complex 7 has SOD activity as its structure is very similar to the active site structure of the native Mn-SOD enzyme. The SOD activity studies on these carboxylate complexes suggest that any model compound with analogous active site structure and intramolecular hydrogen bonding may be a suitable mimic for the Mn-SOD enzyme.
Polyhedron, 1994
The title complex was synthesized by oxidizing manganese(I1) with (NH4)2Ce(N03)6 in acetic acid in the presence of the ligand. The structure of the complex was determined by X-ray crystallography. The nitrate ion and acetic acid molecules are severely disordered. The cis-MnN,Cl, coordination sphere is Jahn-Teller distorted, the axial Mn-N(2) (2.23 1 A) bond being longer than the equatorial Mn-N(1) (2.073 A) bond. Structural comparisons are made with the analogous manganese(I1) complex Mn(bpy),Cl,. The observed optical and EPR spectra show that the complex undergoes disproportionation in various solvents giving manganese(II1, IV) species.
Cationic tri- and dicarbonyl complexes of manganese(I)
Transition Metal Chemistry, 1977
In complexes of the Mn(CO)3 (chelate)OCIO3 and [Mn(CO)3 (chel)(Me2CO)]CIO 4 type, the facile replacement of the OCIO3-or, respectively, Me2CO-groups by a variety of neutral ligands allows the preparation of novel cationic tricarbonyl complexes, [Mn(CO)3(chelate)L]CIO4, at room temperature. Dicarbonyl derivatives, [ Mn(CO)2 (chelate) L2 ]CIO4 or [Mn(CO)2 (chelate) LL' ]C104, can be obtained by working at the reflux temperature. The properties of the novel compounds are given and their structures are discussed.
Polyhedron, 2003
Reactions of 2,2-dimethylpentanedioic acid(2dmepdaH 2 ) and 3,3-dimethylpentanedioic acid (3dmepdaH 2 ) with Mn(CH 3 COO) 2 Á 4H 2 O yield the soluble complexes [Mn(2dmepda)] Á 1.5H 2 O (1) and [Mn(3dmepda)] Á H 2 O (2). Complex 1 reacts with ethanolic solutions of 2,2 0 -bipyridine or 1,10-phenanthroline to give [Mn 2 (2dmepda) 2 (bipy)] Á H 2 O (3) and [Mn(2dmepda)(phen)] (4), respectively. Similar reactions of 2 with these ligands generated [Mn 2 (3dmepda) 2 (bipy) 3 ] Á 5H 2 O (5) [Mn(3dmepda)(phen) 2 ] Á 7.25H 2 O (6). The molecular structure of 6 was determined by X-ray crystallography. The asymmetric unit contains two [Mn(3dmepda)(phen) 2 ] units with 14.5 waters of crystallisation. The two manganese complexes are of very similar structure. In each case the manganese atom is ligated by four nitrogen atoms from two chelating phen molecules and two oxygen atoms, one from each of the carboxylates moieties of the 3dmepda 2À ligand. Thus, the two carboxylate functions of the two 3dmepda 2À dianionic ligands are essentially monodentate. The 2,2-and the 3,3-dimethylpentanedioate complexes, the metal free ligands and a number of simple manganese salts were each tested for their ability to inhibit the growth of Candida albicans. Only the ''metal free'' 1,10-phenanthroline and its 2,2-and the 3,3-dimethylpentanedioate complexes exhibit fungitoxic activity.