A Cyclic Hexanuclear Heterometalladithiolene Cluster [{(Cp~*Rh)2Mo(μ-CO)2(CO)}2(S2C6H2S2)2] with Two π-Conjugated S2C6S2 Bridges: Synthesis, Crystal Structure, and Properties

摘要

Recent attention has focused on metalladithiolenes of late transition metals that contain planar MS2C2 rings because of their redox activity, magnetic properties, deep color, and the addition reactions derived from the quasi aromaticity and electronic unsaturation of the metalladithiolene ring. The metalladichalcogenolene rings can be used as building blocks for metal cluster complexes owing to the electron deficiency of the metal center. We previously described the first example of a metal-metal bond formation reaction using a metalladithiolene complex. In that reaction, a trinuclear heterometal cluster [{CpCo(S2C6H4)}2 Mo(CO)2] (Cp = η~5-C5H5), which possesses a slightly bent Co-Mo-Co unit and extremely deformed cobaltadithiolene rings, was synthesized from a metalladithiolene complex, [CpCo(S2C6H4)], and from [Mo(CO)3(py)3] (py = pyridine). Interestingly, the Co-Co electronic interaction could be transmitted by the molybdenum atom. Another attractive possibility, the formation of heteronuclear metal-metal bonds by dinuclear metalladithiolene complexes, has yet to be explored.