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