Redox tuning of the dimolybdenum compounds at the ligand periphery: a direct correlation with the Hammett constant of the substituents

Oxidation potentials Of [Mo2(ArNCHNAr)4](Ar = aryl), a direct measure of the HOMO (δ orbital) energy, correlate with the Hammett constant of aryl substituents, while both structural and spectroscopic data indicate that the valence structure around the dinuclear core is unperturbed.