Organometallic Selenolates. VII. (Benzylselenolato-Se)tricarbonyl(η5-cyclopentadienyl)molybdenum(II) and Bis[1,2(η5)-cyclopentadienyl]-di-μ-ethylselenolato-di-μ-selenido-dimolybdenum(IV)(Mo—Mo)

Abstract

Compound (1), [Mo(η5-C5H5)(C7H7Se)(CO)3], is monomeric in the solid state. The Cp(CO)3MoSe moiety (where Cp is cyclopentadienyl) displays a `piano-stool' arrangement with an Mo—Se bond length of 2.6294 (4) Å and an essentially ideal tetrahedral bond angle at selenium [109.74 (8)°]. The binuclear compound (2), [Mo2(η5.C5H5)2(C2H5Se)2(Se)2], consists of linear cp–Mo–Mo–Cp moieties with Mo=Mo double bonds, which are quadruply bridged by two pairs of selenido and ethylselenolato ligands.