Synthesis and Characterization of New Platinum(II) and Platinum(IV) Triphyrin Complexes

Metalation of 6,13,20,21-tetrakis­(4-methylphenyl)-22H-tribenzo­[14]­triphyrin­(2.1.1) with PtCl2 gave a platinum­(II) complex having a square-planar coordination structure with two pyrrolic nitrogen atoms and two chloride ions, with a saddle-shaped macrocycle. This platinum­(II) complex was easily oxidized by air to an octahedral platinum­(IV) complex coordinated by three pyrrolic nitrogen atoms as a tridentate monoanionic cyclic ligand and three chloride ions. When platinum­(II) triphyrin was crystallized in air, an oxygen atom was incorporated between two α-carbon atoms of the pyrroles as an oxygen bridge to intercept the 14π aromatic system.