A New Scheme on Kinetics of Nickel(II)Y- L-glutamyl-L-cysteinylglycine

Department of Chemistry, Universty of Delhi, Delhi-110 007 Manuscript received 22 September 1989, revised 22 January 1990, accepted 6 February 1990 Kinetics of complexation of NiII by \(\gamma\)-ʟ-glutamyl-ʟ-cysteinylglycine have been investigated in the pH range 6.23-7.18, I=0.15 M KO8 and at temperatures 25, 30, 35 and 40˚ ( \(\pm\) 0.05˚) using stopped flow spectrophotometer. The values of kobs vary from 36.0 to 962 M-1 s-1 Kinetics of the complexation reaction has been studied in terms of a mechanism in which water loss from the metal ion is an important rate-determining step. Overall rate constants have been resolved into specific rate constants and there is good agreement between the calculated and experimentally obtained values for kobs at various pH's. The values of activation parameters have been evaluated