Structural features of monomeric octahedral <i>d</i><sup>2</sup>-rhenium dioxo complexes with monoand bidentate ligands [reo<sub>2</sub>(l<sub>bi</sub>)(l<sub>mono</sub>)<sub>2</sub>], [reo<sub>2</sub>(l<sub>bi</sub>)<sub>2</sub>] (a review)

Abstract

Structural features of mononuclear octahedral dioxo complexes d 2-Re5+, [ReO2(Lbi)(Lmono)2], [ReO2(Lbi)2] with mono- and bidentate ligands were considered. The multiply bound Ooxo ligands are located predominantly in trans -positions to each other, with two exceptions, with the cis -orientaion of the ReO2 fragment. Rhenium atoms in most complexes have the trans -octahedral ReOoxo2X4 (X = N, P, As, O) coordination, in two cases they have the cis -octahedral ReOoxo2N4 structure. Re=Ooxo bonds in d 2-Re(V) monomeric octahedral dioxo compounds ( d average 1.772 Å) are much longer than in d 2-Re(V) monooxo complexes ( d average 1.676-1.699 Å).