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IJC-A Vol.46A(05) [May 2007] >


Title: Electrochemical behaviour of Ni(II) l-amino acid in aqueous dimethylformamide, N-methyl formamide and formamide media at dme
Authors: Bairwa, B S
Goyal, Monika
Sharma, I K
Varshney, S
Verma, P S
Issue Date: May-2007
Publisher: CSIR
Abstract: Polarographic technique has been used to evaluate the kinetic parameters and formation constants of Ni(II) complexes with l-arginine, l-lysine, l-tryptophan, l-tyrosine, l- aspartic acid and l- glutamic acid at pH 8.40±0.20 and constant ionic strength (μ= 0.1) NaClO₄ in aqueous DMF, N-methyl formamide and formamide mixture at d.m.e. The reduction of all these complexes is found to be irreversible and hence the kinetic parameters (K⁰fh, ⍺n,ξ) of these complexes have been calculated using Meites-Israel method and its modification by Gaur and Bhargava. In all the cases a single reduction wave is obtained but in the case of Ni(II) l-lysine complex in N-methyl formamide, two waves are obtained. This could possibly be due to the fact that the complex may have split in solution forming the aquo nickel complex, which reduces at sufficiently negative potential to the corresponding complex. One wave is found to be diffusion controlled while the other is a kinetic wave.
Page(s): 778-782
ISSN: 0376-4710
Source:IJC-A Vol.46A(05) [May 2007]

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