Cluster growth reactions with selenido–carbonyl clusters. Synthesis and structural characterization of [M2Ru2(µ4-Se)2(µ-CO)4(CO)6(PPh3)2] (M = Mo or W)‡

The open-triangular, nido cluster [Ru3(µ3-Se)2(CO)7(PPh3)2] (50 electrons, seven skeletal electron pairs, s.e.p.s) reacted at room temperature with [M(CO)3(MeCN)3] (M = Mo or W) to give unexpectedly the bicapped, square-planar clusters [M2Ru2(µ4-Se)2(µ-CO)4(CO)6(PPh3)2] as unique products; they exhibit an electron-deficient closo geometry with 60 electrons and six s.e.p.s.

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