Hypo-electronic triple-decker sandwich complexes: synthesis and structural characterization of [(Cp*Mo)2{μ-η(6):η(6)-B4H4E-Ru(CO)3}] (E = S, Se, Te or Ru(CO)3 and Cp* = η(5)-C5Me5).

摘要: The syntheses and structural characterization of hypo-electronic di-molybdenum triple-decker sandwich clusters are reported. Thermolysis [Ru3(CO)12] with an in situ generated intermediate obtained from the reaction [Cp*MoCl4] [LiBH4·THF] yielded electron deficient complex, [(Cp*Mo)2{μ-η(6):η(6)-B4H4Ru2(CO)6}], . In effort to generate analogous triple-deckers containing group-16 elements, we isolated [(Cp*Mo)2{μ-η(6):η(6)-B4H4ERu(CO)3}] (: E = Te; : S; Se). These show a high metal coordination number cross cluster Mo-Mo bond. formal count these compounds is four or three skeletal pairs less than required for canonical closo-structure same nuclearity. Therefore, represent novel class complex 22 24 valence-electrons (VE), wherein "chair" like hexagonal middle ring composed B, Ru chalcogen. One key differences among synthesized molecules puckering nature [B4RuE], which increases order S < Se Ru(CO)3 Te. addition, Fenske-Hall quantum-chemical calculations DFT methods at BP86 level theory have been used analyze bonding complexes. studies not only explain unsaturation molecules, but also reveal reason significant deck. All characterized by IR, (1)H, (11)B, (13)C NMR spectroscopy solution solid state structures were established crystallographic analysis.