Dimolybdenum(II) Trifluoromethanesulfonates. The Coordination of Mo₂⁺⁴ by Weak Bidentate Ligands

Abstract

It is now apparent that there is a substantial coordination chemistry of binuclear cations M₂ ⁺⁴ where M is one of several second row transition metals. The existence of a large number of tetra-μ-carboxylates of Mo₂ ⁺⁴ and the ability to substitute various ligaiids for the carboxylates are reflections of this. 1–7 As indicated by both theoretical and structural studies, the bond between two molybdenum(II)'s is a quadruple bond and is very strong.^2,8,9 A striking indication that the bond maintains its integrity in solution is in the proof of the existence of Mo₂ ⁺⁴ as a stable ion in aqueous solution.³