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Title: Potentiometric studies on the stability constants of some -amino acid-copper(II) and nickel(II) systems in ethanol-water mixture
Authors: Dogan, Alev
Kilic, Esma
Issue Date: Jul-2003
Publisher: NISCAIR-CSIR, India
Abstract: The stability constants for the nickel(II) and copper(II)-α-amino acid (glycine, L-alanine, L -valine, L-leucine, L -isoleucine, L-serine,L -phenylalanine and L-methionine) binary complex systems have been studied using pH-measurements in 40% ethanol-60% water mixture. The study shows that at 25°C and ionic strength at 0.10 M the following species are present in this solvent mixture: CuHL2+, CuL+, CUL2 for copper(II) complexes and NiL+, NiL2, NiL3- for nickel(II) complexes. The stability of the nickel(II) complexes is lower than that of the copper(II) complexes. The study shows that the tendency of a-amino acids to form complexes with metal(II) ions is greater in 40% ethanol-60% water mixture as compared to that in only water.
Page(s): 1632-1635
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.42A(07) [July 2003]

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