Studies on transition-metal cyano-complexes. Part 2. Unsubstituted cyanorhenates, [Re(CN)x]n–, and cyanorhenates with thio-, seleno-, and nitrosyl ligands

Abstract

The preparation and structural characterisation of salts of the species [Re(CN)₇]^4–, [Re₄(CN)₁₂(µ₃-S)₄]^4–[Re₄(CN)₁₂(µ₃-Se)₄]^4–, [Re₂(CN)₈(µ₂-S)]^4–, and [Re(CN)₅(NO)]^3– are described. Reinvestigation of all the reactions reported to give unsubstituted cyanorhenates confirms the existence of [Re(CN)₇]^4– and [Re(CN)₆]^5– only; the other species are reformulated. The nature of some cyano-oxorhenates reported in the literature is also discussed.