Electrochemistry of N-heterocyclic complexes of rhodium(I) and iridium(I)

Article abstract of DOI:10.1021/ic00133a031

Cyclic voltammograms and EPR spectra of stable reduced species are reported for some complexes of the general formula [M(chel)(diene)]⁺: M = Rh(I), Ir(I); chel = 2,2′-bipyridine, 1,10-phenanthroline, 4,7-diphenyl-1,10-phenanthroline, 2,2′-bipyrazine; diene = 1,5-cyclooctadiene, 2,5-norbornadiene. The complexes showed two reversible one-electron reductions in acetonitrile at a Pt wire electrode. EPR spectra of the one-electron-reduced species were typically singlets (ΔH_pp ? 8 G) at a g value of 2.001. The data indicate that the redox orbital is ligand π*_chel.