the kinetics and mechanisms of substitution reactions of trans-[co(en)2cncl]+ in binary mixed solvent

the kinetics and mechanisms of the substitution reactions of trans-[co(en)2cncl]+ with unidentate anions,  , cn¯, i¯,  , br¯ and scn¯ in 60% v/v dmf-h2o binary solvent at 40.0±0.2 °c were studied spectrophotometrically. an id mechanism was assigned for the replacement of chlorine by , cn¯ and i¯, an ia one for the entry of  and scn¯, and a d mechanism for br¯ entry. comparing the interchange rate constants, ki, values has led to the following trend of reactivity of the anions toward the given substrate:   the replacement of chlorine by the anions proceeded with a complete retention of configuration.