Synthesis and molecular structure of (η5-pentamethyl-cyclopentadienyl) (η5-cyclopentadienyl) hexacarbonyl molybdenum tungsten

Metathesis of Cp*(CO)3MoBr and NaW(CO)3Cp produced Cp*(CO)3Mo-W(CO)3Cp. Its solid state structure exhibits an anti-arrangement of the η5-cyclopentadienyl and the η5-pentamethyl-cyclopentadienyl ligands that also dictate the Mo-W bond length. This is the first time that an unsupported Mo-W single bond distance is reported.