Chemistry and Materials Research
Mechanism and Cyclic Voltammetry of Cu(en)2X2.nH2O Complexes in Some Nonaqueous Solvents
Abstract
The electrochemical studies of solid 2.0 X 10-3M Cu(en)2X2.nH2O (n=0 for X=ClO4-, NO3-, SCN-, and n=1for Br-) in dimethylsulfoxide, acetonitrile , and dimetylformamide /0.1M tetrabuthylammonium perchlorate , have been carried out by cyclic voltammetry. The electrode process shows two electro reduction and two chemical steps(CECE) mechanism. The reduction potentials of Cu(en)2(ClO4)2 shift in the order DMF? DMSO ? AN contrary to one’s expectation. For Cu(en)2(NO3)2 and Cu(en)2(SCN)2, the reduction potentials are more negative in DMSO relative to DMF as expected. In DMF, the reduction potentials Epc1 shift anodically in the order: Cu(en)2(ClO4)2 ? Cu(en)2(NO3)2 ? Cu(en)2(SCN)2 indicating that Epc1 is also dependent on the nature of the anion, X
Keywords: Cu(en)2X2.nH2O, Nonaqueous Solvent, Voltammogram, CECE mechanism, Reduction potential
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ISSN (Paper)2224-3224 ISSN (Online)2225-0956
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