Metallkomplexe mit Tetrapyrrol-Liganden, XXIV [1]. Zur Kenntnis der Platin(IV)-Porphyrine / Metal Complexes with Tetrapyrrole Ligands, XXIV [1]. On the Knowledge of Platinum(IV) Porphyrins

Johann W. Buchler, Kiong-Lam Lay, Harald Stoppa
1980 Zeitschrift für Naturforschung. B, A journal of chemical sciences  
The first platinum(IV) porphyrin, dichloromeso-tetra(p-tolyl)porphinatoplatinum(IV) [Pt(TPP)Cl2**], is prepared by oxidation of the corresponding platinum(II) complex [Pt(TTP)**] with hydrogen peroxide in acidic media and treatment with hydrogen chloride. Pt(TTP)Cl2 is thermally stable up to 200 °C. Electrochemical reduction yields Pt(TTP), presumably by a two-electron step. The platinum-to-porphyrin π-backbonding known to exist in Pt(TTP) decreases on oxidation to Pt(TTP)Cl2 but does not
more » ... but does not vanish. An improved synthesis of Pt(TTP) is described. Evidence for the accessibility of Pt(OEP)Cl2 and Pd(TTP)Cl2 is also presented.
doi:10.1515/znb-1980-0405 fatcat:zgsfxjeh5fhchin6pnncyf26gu