Polypyridyl first-row transition-metal complexes are of interest for their potential to act as chromophores for novel C-C bond forming schemes. Previously reported Cr(III) aromatic diimine complexes were demonstrated to show strongly photooxidizing properties.1 The isoelectronic V(II) analogues of these Cr(III) species are targeted for red-shifting electronic absorptions further into the visible spectrum. Comparison of redox potentials for V(II) bipyridine complexes points toward the need for strongly electron-withdrawing moieties to shift redox potentials to more positive values to be comparable with Cr(III) complexes.2 The coupling of a V(II) metal center to electron-withdrawing ligands should allow for a more effective visible-light activation of the photooxidant when compared to similar Cr(III) complexes. The syntheses, crystal structures, redox potentials, electronic transitions and photocatalytic screening of these complexes will be presented. 1) McDaniel, A. M.; Tseng, H. W.; Damrauer, N. H.; Shores, M. P. Inorg. Chem. 2010, 49, 7891-7991. 2) Bowman, A. C.; Sproules, S.; Wieghardt, K. Inorg. Chem. 2012, 51, 3707-3717.

Investigation of substituted bidentate polypyridyl vanadium chromophores for photocatalysis

249th National Meeting (2015)

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