ELECTRONIC TUNING USING REMOTE SUBSTITUENTS IN TETRAKIS(MU-N,N'-DIARYLFORMAMIDINATO)DINICKEL - LINEAR FREE-ENERGY RELATIONSHIP IN DINUCLEARCOMPOUNDS .3.

The series of tetrakis(mu-N,N'-diarylformamidinato)dinickel(II), where the aryl is the phenyl modified with various substituent (X), is synt hesized and thoroughly characterized. While both the coordination geom etry and the UV-vis spectra remain essentially independent of X across the series, the one-electron oxidation potential, E(1/2)(Ni-2(5+)/Ni- 2(4+)), correlates with the Hammett constant (sigma(x)) of substituent s according to the equation: E(1/2)(X) - E(1/2)(H) = 114(8 sigma(x) (m V).