Synthesis and crystal structure of [Mo 2FePt(μ-σ,σ′,σ″:η 5-CC 5H 4) 2(CO) 4{HB(pz) 3}2][HB(pz) 3 = Hydrotris(pyrazol-1-yl)borate]; A complex derived from a 1,1′-ferrocene derivative with CMo(CO) 2{HB(pz) 3} substituents

Abstract

Treatment of [Mo(CO) 6] in tetrahydrofuran, with 1,1′-dilithioferrocene in light petroleum, followed by (CF 3CO) 2O and tmeda (Me 2NCH 2CH 2NMe 2) affords the ferrocene- substituted bis(alkylidynemolybdenum) complex [Mo 2Fe(μ-σ, σ′,:η 5-CC 5H 4) 2(O 2CCF 3) 2 (CO) 4(tmeda) 2]. The latter with K[HB(pz) 3] [HB(pz) 3 = hydrotris(pyrazol-1-yl)borate] in CH 2Cl 2 gives [Mo 2Fe(μ-σ,σ′:gh 5 -CC 5H 4) 2(CO) 4{HB(pz) 3} 2], which with [Pt(cod) 2] (cod = cyclo-octa-1,5-diene), in light petroleum saturated with ethylene, yields the tetranuclear metal complex [Mo 2FePt(μ-σ,σ′,δ″:η 5-CC 5H 4) 2(CO) 4{HB(pz) 3} 2]. The structure of this product was established by X-ray diffraction, and the results of this study are compared with those obtained for related compounds in which the two metal-metal bonds of an acyclic trimetal system, in this case MoPtMo, are each spanned by an alkylidyne group and semi-bridged by a carbonyl ligand.