New clusters [Co2(CO)6]2μ-HC2RC2H) [R=C6H4(CO2CH2)2-1,2 2, CH2OCH23, (CH2)54] have been isolated from the reaction of Co2(CO)81 with diyne ligands HC=CRC=CH, and the structure of 2 has been established by single-crystal X-ray diffraction methods.
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