A PULSE-RADIOLYSIS STUDY OF TETRAAMMINEPLATINUM(II) COMPLEX ION IN AQUEOUS CHLORIDE MEDIA

The reaction of the dichloride anion radical with the tetraammineplatinum(II) ion has been studied in aqueous, acidic solution using the fast-reaction technique of pulse radiolysis in conjunction with UV-visible absorption detection. The second-order rate constant for the reaction of the dichloride anion radical with the platinum(II) complex is calculated to be (9 plus or minus 1) multiplied by 10**9 dm**3 multiplied by (times) mol** minus **1 multiplied by (times) s** minus **1, and the reaction leads to products which absorb strongly in the region of 250-350 nm. Very similar spectral features arise from the reaction of hydroxyl radical and Pt(NH//3)//4**2** plus in the presence of low concentrations of free chloride ions. The transients are proposed to be platinum(III) chloro species, and the interrelationships between the species are discussed.