Abstract Kinetic studies of the redox reactions of the head-to-tail (HT) α-pyridonato-bridged cis-diammineplatinum (III) dinuclear complex and of the head-to-head (HH) α-pyridonato- bridged and α-pyrrolidonato-bridged cis-diammineplatinum (III) dinuclear complexes with phenol were performed in acidic aqueous solution. Reduction of the HH Pt III dinuclear complexes with phenol proceeded only at pH> 3, whereas that of the HT Pt III dinuclear ...