X-Ray absorption spectroscopic studies of the Cr(IV) 2-ethyl-2-hydroxybutanoato(1–) complex†

Abstract

The first X-ray absorption spectrum of the rare Cr(IV) oxidation state has been obtained for the complex with the ehbaH ligand [ehbaH = 2-ethyl-2-hydroxybutanoate(1–)] in frozen aqueous solution (14 K), showing that at pH = 3.5 and in a large excess of the ligand, the predominant form of Cr(IV) is the five-coordinate oxo complex, [Cr^IVO- (ehbaH)₂]⁰.