Kinetic and binding studies of the thiolate-cobalt tetrasulfophthalocyanine anaerobic reaction as a subset of the Merox process

Thiolate binding to cobalt tetrasulfophthalocyanine (CoTSPc) is a multi-step process with the intermediate formation of outer-sphere complexes. Binding of the second thiolate occurs when CoTSPc is oligomeric (in aqueous media) and is accompanied by pronounced cobalt(II) reduction (rate-limiting step). This anaerobic process, including the 2:1 thiolate-CoTSPc stoichiometry, is a subset of the aerobic Merox process (CoTSPc-catalyzed thiolate autoxidation).