3th WCSET-2014 at Nepal

Keynote Session:

Title:           Some unusual end-on bis (µ-acetato/µ-nitrato) bridged copper(II) complexes: Synthesis, structures and magnetic properties
Authors:       R. N. Patel
Abstract:     Four bridged binuclear end-on bis(μ-acetato/μ-nitrato) complexes with two NNO donor ligands, viz., [(L1)Cu(μ-CH3COO)2Cu(L1)].4,4-bipy 1, [(L2)Cu(μ-NO3)2Cu(L2)] 2, [(L3)Cu(μ-CH3COO)2Cu(L3 )] 3 and [(L3 )Cu(μ- NO3)2Cu(L3)] 4 where [L1= N’-[phenyl(pyridin-2-yl) methylidene]furan-2-carbohydrazide, L2 = (2E,4Z)-N,2- dimethylhepta-2,4,6-trienamide-1- phenyl-1- pyridin-2-ylmethanimine and L3 = N’-[phenyl(pyridin-2-yl) methylidene] benzohydrazone) μ-CH3COO- = μ-acetato and μ-NO3 - = μ-nitrato) have been prepared and physiochemically characterized. These complexes are structurally characterized by X-ray crystallography. In these complexes, the two copper centers are linked by two acetate or two nitrate groups in end-on bonding fashion. The copper–copper separation is 3.28 Å for 1, 3.46 Å for 2, and 3.34 Å for 3 and 3.40 Å for 4. The copper ions are pentacoordinated in all complexes. The coordination geometry may be described as close to square pyramidal (SP) stereochemistry with slight distortion to trigonal bipyramidal (TBP) stereochemistry. The cyclic voltammograms (CV) of these complexes have been investigated. The cathodic CV of these complexes (1-4) displays two reduction waves. Two one electron reductive responses are observed due to metal coupling for these complexes.

Pages:         051-055

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