Interaction of some azole bases with [Pt(dien)Br](+): Conductometric and spectrophotometric studies

Kinetics of the reaction of four azole bases (e.g., imidazole, benzimidazol e, pyrazole and triazole) with [Pt(dien)Br](+) (dien = diethylenetriamine) has been studied in aqueous solution (27 degrees C) by conductometric and s pectrophotometric methods. The reactions follow normal square-planar substi tution having the rate law under pseudo-first order condition, k(obs) = k(1 ) + k(2)[azole base]. The aged solution of [Pt(dien)Br](+) shows biphasic r eaction traces due to formation of the reactive [Pt(dien)(H2O)](2+) in solu tion. The adducts formed with these bases have been isolated and characteri sed.