Transition metal complexes of furfural and benzil schiff bases derived from S-benzyldithiocarbazate |
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Authors: | MAkbar Ali RN Bose |
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Institution: | Department of Chemistry, University of Chittagong, Chittagong Bangladesh;Department of Chemistry, Dhaka University, Dhaka, Bangladesh |
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Abstract: | New nickel(II), copper(II), cobalt(III) and rohdium(III) complexes of two Schiff base ligands formed by condensation of furfural and benzil with S-benzyldithiocarbazate have been synthesized and characterized by elemental analysis and magnetic and spectroscopic measurements. The nickel(II) complexes, Ni(NS)2 and Ni(ONS)2 (NS and ONS stand for the uninegatively charged furfural and benzil Schiff bases, respectively) are square-planar and octahedral, respectively. The Cu(NS)Cl complex is paramagnetic with a magnetic moment fo 1.73 B.M. A halogen-bridged dimeric structure is proposed for this complex. The copper(II) complex, Cu(ONS)Cl is diamagnetic, suggesting strong antiferromagnetic interactions between a pair of copper(II) ions in a thiolo sulphur-bridged dimeric or polymeric structure. Cobalt(II) ions are oxidized in the presence of the Schiff bases with the concomitant formation of cobalt(III) complexes of empirical formulae, Co(NS)3, Co(ONS)2ClO4 and Co(ONS)2Cl, respectively, which are spin-paired and octahedral. The rhodium(III) complex of the furfural Schiff base, Rh(NS)2Cl is tentatively assigned a halogen-bridged dimeric structre. |
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Keywords: | Author to whom correspondence should be addressed |
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