The characterization of the saddle shaped nickel(<scp>iii</scp>) porphyrin radical cation: an explicative NMR model for a ferromagnetically coupled metallo-porphyrin radical

Abstract

Ni(III)(OETPP˙)(Br)2 is the first Ni(III) porphyrin radical cation with structural and (1)H and (13)C paramagnetic NMR data for porphyrinate systems. Associating EPR and NMR analyses with DFT calculations as a new model is capable of clearly determining the dominant state from two controversial spin distributions in the ring to be the Ni(III) LS coupled with an a1u spin-up radical.