Stabilization of Low‐Oxidation‐State Early Transition‐Metal Complexes Bearing 1,2,4‐Triphosphacyclopentadienyl Ligands: Structure of [{Sc(P₃C₂<i>t</i>Bu₂)₂}₂]; Sc^II or Mixed Oxidation State?

Abstract

ScII or mixed oxidation state ScIII/ScI? Reduction of the homoleptic ScIII complex [Sc(P3C2tBu2)3] allows access to the subvalent [{Sc(P3C2tBu2)2}2] complex (see picture), in which the metal centers are formally bivalent. DFT calculations support fomulation of the reduced species as a mixed oxidation state ScIII/ScI complex.