Kinetics of cemplexation of nickel (II) with -ɑ-aminoisocaproic acid, <img src='http://www.niscair.res.in/jinfo/small.gif' border=0> -ɑ-amino-γ-methylthio-n-butyric acid & histidine methyl ester

284-287The title reactions have been studied at 25-45ᵒ (&plusmn;0.05&deg;C) and at I = 0.1 mol dm-3 KNO3 in the pH range of 6.35-7.39 for -ɑ-aminoisocaproic acid, 6.24-7.29 for -ɑ-amino-&gamma;-methylthio-n-buryric acid and 6.45-7.10 for histidine methyl ester. Rate constants for the formation of Ni(II) complexes with the anions and zwitterions of these three ligands have been determined by stopped flow method and activation parameters have been calculated. The values of Kos (outer sphere complex formation constant) and ko (rate constant for water exchange have also been calculated