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Title: Intramolecularly H-bonded bis-benzimidazole diamide ligand and its Mn(II) complexes: Synthesis, spectral and electrochemical studies
Authors: Mohapatra, Subash Chandra
Bakshi, Ruchi
Hundal, M S
Mathur, Pavan
Keywords: Coordination chemistry
Superoxide quenching
Issue Date: Feb-2010
Publisher: CSIR
IPC CodeInt. Cl. 9 C07F13/00
Abstract: New manganese(II) complexes with a diamide ligand N,N'-bis(benzimidazolyl-2yl)(methyl)pentane diamide have been synthesized with the general composition [Mn(GBGA)2X2] where X = Cl-, CH3COO-, SCN-, ClO4-. The ligand has been structurally characterized and has been found to adopt a helical structure stabilized by strong intramolecular and intermolecular H-bonding. The ligand crystallizes in the monoclinic space group P21/c with unit cell dimensions: a = 14.180(5) Å, b = 8.454(5) Å, c = 19.353(5) Å, = 90.000°, β=108.232(5)°, = 90.000° and Z=2. X-band solid state EPR spectra for the Mn(II) complexes have been obtained indicating weakly distorted octahedral complexes with D ranging between 0.05-0.14 cm-1. Cyclic votammograms display a quasi-reversible redox wave. The E1/2 values follow the order: SCN- < CH3COO- < Cl- ~ ClO4-. Quenching of superoxide anion is studied by cyclic voltammetry. From the plot of total peak current versus concentration of the added Mn(II) catalysts, the break points and turnover of catalyst have been evaluated.
Page(s): 159-166
ISSN: 0975-0975(Online); 0376-4710(Print)
Source:IJC-A Vol.49A(02) [February 2010]

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