Cationic diimine platinum complexes

The complexes undergo reversible one-electron reduction to form the radical anion species, which were characterized by absorption spectra and EPR spectra at multi-frequency.Bis(mesityl)platinum complexes with 7r-conju-gated diimine ligands show emission behavior. " Substitution of DMSO ligands of PtClPh(DMSO)2 with terpy forms a cationic phenylplatinum complex 236 (Equation (66)). ... 

Rate and equilibrium constant data, including substituent and isotope effects, for the reaction of [Pt(bpy)2]2+ with hydroxide, are all consistent with, and interpreted in terms of, reversible addition of the hydroxide to the coordinated 2,2 -bipyridyl (397). Equilibrium constants for addition of hydroxide to a series of platinum(II)-diimine cations [Pt(diimine)2]2+, the diimines being 2,2 -bipyridyl, 2,2 -bipyrazine, 3,3 -bipyridazine, and 2,2 -bipyrimidine, suggest that hydroxide adds at the 6 position of the coordinated ligand (398). Support for this covalent hydration mechanism for hydroxide attack at coordinated diimines comes from crystal structure determinations of binuclear mixed valence copper(I)/copper(II) complexes of 2-hydroxylated 1,10-phenanthroline and 2,2 -bipyridyl (399). 

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