Abstract

A series of cyclometallated platinum(II) species with N---N---C ligands (N---N---C=ortho-C-deprotonated form of 6-benzyl-substituted 2,2′-bipyridines) and different fourth monodentate ligands (Cl⁻, I⁻, CN⁻, CO, PPh₃, Py, MeCN) has been investigated electrochemically, with particular emphasis to the analysis of the relatively stable one-electron reduced species. EPR spectra have been recorded at different temperatures on the electroreduced solutions. The analyses were supported by a systematic comparison with simulated spectra and allowed a definition of the interaction of the additional unpaired electron with the ¹⁹⁵Pt, ¹⁴N, and ¹H nuclei present in the molecule. Attention has been also paid to the effects of the ligands on the thermodynamics (E_1/2,r) of the reduction, as well as to some reactivity aspects of the substrates that could be shown by voltammetric tests. A number of these compounds have been synthesised for the first time, so that a full characterisation has been performed.

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