First structural characterisation of 1,2,4-selenadiphosphole and 1,2,4-telluradiphosphole ring systems. Crystal and molecular structures of the #eta#~1-complexes [M(CO)_5(P_2SeC_2Bu_2~t)] (M = Cr, W) and [W(CO)_5(P_2TeC_2Bu_2~t)]

摘要

The molecular geometries of the 1,2,4-selenadiphosphole and the 1,2,4-telluradiphosphole aromatic ring systems, established by single crystal X-ray diffraction studies on their metal pentacarbonyl complexes, are presented and discussed together with theoretical data.