Spectrophotometric Study on the Complexation Reaction of Platinum(IV) with Perphenazine

Department of Post-graduate Studies and Research in Chemistry, University of Mysore, Manasa Gangotri, Mysore 570 006. Manuscript received 4 October 1978, revised 20 March 1979, accepted 27 April 1979 Perphenazine forms a purple coloured complex with platinum(IV) in hydrochloric acid-sodium acetate buffer containing copper catalyst. The complex has an absorption maximum at 528 um with molar absorptivity 1.289 x 104 1. mole-1 cm-1. The sensiti­vity of the reaction is 15.15 ng/cm2. Beer's law is valid over the concentration range 0.5­8.5 ppm of platinum(IV) with optimum concentration range 0.9-8.4 ppm. Continuous variations, mole ratio and slope ratio methods indicate 1: 1 composition for the complex. The effects of pH, time, temperature, order of addition of reagents, reagent concentration and interferences from various ions are reported. The reagent is successfully used for the determination of platinum in minerals and alloys