Abstract
Multinuclear (i.e. 1H, 13C, and 195Pt) NMR spectra of six platinum(IV) porphyrin complexes are reported. Compared with their platinum (II) porphyrin precursors, alpha-carbon (C α) resonances are shifted further upfield, 1H 195Pt and 13C 195Pt coupling constants are significantly reduced, 195Pt resonances are shifted further downfield (their relative positions being more strongly affected by macrocyclic substitution) and 195Pt peaks are appreciably narrowed. These differences are rationalized in terms of oxidation leading to reduced coupling of 195Pt to the 14N, 13C and 1H atoms of the porphyrin, a slight increase in d-π * back-bonding and its modulation by porphyrin substituents.
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