Acetylene linkage at a di-metal centre: X-ray crystal structures of [Cr2(CO)(η-C5H5)2(PhC2Ph)2] and [Mo2(η-C5H5)2{(MeO2CC2CO2Me)-(HC2H)(MeO2CC2CO2Me)2}]

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Abstract
A sequence of acetylene linking at a di-metal centre has been identified; X-ray diffraction studies have established the structures of di-chromium and di-molybdenum complexes containing two and four acetylene molecules, respectively.