Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/42318
Title: Electrochemistry of binary and mixed-ligand copper(II) complexes with pyrazine and dicyanamide bridging ligands in aqueous medium
Authors: Prakash, Ved
Srivastava, Krishna
Prasad, Jagdish
Keywords: Electrochemistry;UV-visible spectra;Binary complexes;Bridging ligands;Copper;Pyrazine;Dicyanamide
Issue Date: Jun-2017
Publisher: NISCAIR-CSIR, India
Abstract: The binary copper(II) complexes, viz., [Cu(II) (pyz)n(H2O)n] (1), and [Cu(II)(dca)n(H2O)n] (2), and, mixed ligand complex, [Cu(II) (dca)n(pyz)n]. nH2O (3), containing pyrazine (pyz) and dicyanamide (dca) bridging ligands (where n is number of ligand attached and it could be 1 to 6 ) are formed in aqueous medium. The electrochemical behavior of binary complexes in 1:1, 1:2 and 1:10 (Cu : pyz/dca) molar ratios and mixed ligand complex in 1: 1 :1 and 1:2:1 (Cu:dca:pyz) molar ratios have been carried out by cyclic voltammetry. The binary complex 1 undergoes a quasi-reversible single-electron redox process (Cu2+/+), while the binary complex 2 exhibits a totally irreversible reduction peak involving two electrons corresponding to Cu2+/0 change. The reduction potential becomes positive with increasing concentration of pyz/or dca, clearly indicating that reduction becomes easier with increasing concentration of ligand in binary complexes. The mixed ligand complex 3 involving pyz and dca bridging ligands shows an irreversible reduction peak assigned to Cu2+/0 electrode reactions. The UV-vis spectral properties of all the binary and mixed ligand complexes have been studied in aqueous medium.
Page(s): 585-591
URI: http://nopr.niscair.res.in/handle/123456789/42318
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.56A(06) [June 2017]

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