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Dicatecholatodipyridinetin(IV) in nitrobenzene showed an increase in molar conductance with time, suggesting solvation of the complex. In the presence of nucleophilic reagents, such as SOCl2 ,C 6H5COCl and CH3COCl, the conductan- ce increased sharply owing to the substitution of pyridine by chloride ions. The data for the rate constant of solvation (ks) and for nucleophilic substitution (k1 and k2) have been calculated and it was found that the solvation is a slower process com- pared to the substitution by chloride ions, i.e., k1, k2 > ks. The nucleophilic substitu- tion reaction follows the SN1 mechanism.

Synthesis, kinetics and mechanism of nucleophilic substitution in octahedral (cat)2Sn(py)2