Tetra-μ3-selenido-1:2:3κ3 Se;1:2:4κ3 Se;1:3:4κ3 Se;2:3:4κ3 Se-tetrakis[(η5-methylcyclopentadienyl)molybdenum(III)](6 Mo—Mo)

Abstract

The title cluster compound, [Mo4(η5-C5H4Me)4(μ3-Se)4], was synthesized from the reaction of [Mo(η5-C5H4Me)(CO)3]2 with grey selenium in refluxing xylene solution under a nitrogen atmosphere. The complete cluster is generated by a crystallographic twofold axis and contains an Mo4Se4 cubane-like core surrounded by four η5-methylcyclopentadienyl ligands. In the core, the four molybdenum atoms are connected to each other to form a tetrahedron, with a selenium atom capping each face. The Mo—Mo bond lengths vary from 2.9857 (5) to 3.0083 (3) Å and the Mo—Se separations range from 2.4633 (4) to 2.4693 (5) Å.