Synthesis, structural characterization and redox properties of copper(II) and manganese(II) complexes containing tridentate (N-(2-methylpyridine)-2-aminomethyl benzoate) ligand
摘要:
Two new complexes, [Cu(mamba)(2)] and [Mn(mamba)(2)] (mamba(-), N-(2-methylpyridine)-2-aminomethyl benzoate) were synthesized and characterized by X-ray crystallography. Whereas the [Cu(mamba)(2)] complex crystallizes in a monoclinic P2(1)/c space group, the [Mn(mamba)(2)] complex crystallizes in a triclinic P (l) over bar space group. The nature of the metal ion greatly influences the lattices and the molecular structures of the compounds. In the crystal lattice of the copper complex are four cocrystallized methanol solvent, which are all involved in building six strong H-bonds with the complex. However, the lattice for the manganese complex contain only one cocrystallized methanol, along with one NaClO4, that is also involved in making one H-bond with the [Mn(mamba)(2)] unit. Nevertheless, the sodium ion is coordinated to the ClO4, the methanol and two [Mn(mamba)(2)] to form a stable extended chain metal complex. Electrochemical studies indicated that both complexes undergo quasi reversible one electron reduction in acetonitrile. (C) 2003 Elsevier B.V. All rights reserved.
Hexacoordinated cobalt(II) and nickel(II) complexes of a novel mixed ligand, N-(2-methylpyridine)-2-aminomethyl benzoic acid: structures, spectroscopic characterizations and redox studies
作者:Xiaobao Li、Ghezai T Musie、Douglas R Powell
DOI:10.1016/s0020-1693(03)00339-6
日期:2003.11
Two new metal complexes, [Co(Mamba)(2)] and [Ni(Mamba)(2)], have been prepared by the treatment of the tridentate ligand N-(2-methylpyridine)-2-aminomethyl benzoic acid (HMamba) with the respective metal salts (CO(ClO4)(2) and Ni(C2H3O2)(2)) in the presence of sodium hydroxide. The ligand was synthesized by reduction of the Schiff base which was obtained by condensation of 2-carboxybenzaldehyde with 2-(aminomethyl)pyridine, The complexes have been characterized using single crystal X-ray diffraction and other spectroscopic techniques. The structures of the complexes are octahedral with each metal center chelated to two ligands through the amine nitrogen atom, the pyridine nitrogen atom and benzoic acid oxygen atom of each Mamba(-). In solid state, an extended networks of H-bonding between cocrystallized solvent molecules and the metal complexes have been observed. Electrochemical studies of the complexes revealed the presence of metal-based one electron quasi-reversible reduction in acetonitrile. (C) 2003 Elsevier B.V. All rights reserved.
Synthesis, structural characterization and redox properties of copper(II) and manganese(II) complexes containing tridentate (N-(2-methylpyridine)-2-aminomethyl benzoate) ligand
作者:Ghezai T Musie、Xiaobao Li、Douglas R Powell
DOI:10.1016/j.ica.2003.10.025
日期:2004.3
Two new complexes, [Cu(mamba)(2)] and [Mn(mamba)(2)] (mamba(-), N-(2-methylpyridine)-2-aminomethyl benzoate) were synthesized and characterized by X-ray crystallography. Whereas the [Cu(mamba)(2)] complex crystallizes in a monoclinic P2(1)/c space group, the [Mn(mamba)(2)] complex crystallizes in a triclinic P (l) over bar space group. The nature of the metal ion greatly influences the lattices and the molecular structures of the compounds. In the crystal lattice of the copper complex are four cocrystallized methanol solvent, which are all involved in building six strong H-bonds with the complex. However, the lattice for the manganese complex contain only one cocrystallized methanol, along with one NaClO4, that is also involved in making one H-bond with the [Mn(mamba)(2)] unit. Nevertheless, the sodium ion is coordinated to the ClO4, the methanol and two [Mn(mamba)(2)] to form a stable extended chain metal complex. Electrochemical studies indicated that both complexes undergo quasi reversible one electron reduction in acetonitrile. (C) 2003 Elsevier B.V. All rights reserved.