trans-Acetyldicarbonyl(η5-cyclopentadienyl)(methyldiphenylphosphane)molybdenum(II)

Abstract

The title compound, [Mo(C5H5)(C2H3O)(C13H13P)(CO)2], was prepared by reaction of [Mo(CH3)(C5H5)(CO)3] with methyldiphenylphosphane. The MoII atom exhibits a four-legged piano-stool coordination geometry with the acetyl and phosphane ligands trans to each other. There are several intermolecular C—H...O hydrogen-bonding interactions involving carbonyl and acetyl O atoms as acceptors. A close nearly parallel π–π interaction between the cyclopentadienyl plane and the phenyl ring of the phosphane ligand is present, with an angle of 6.4 (1)° between the two least-squares planes. The centroid-to-centroid distance between these groups is 3.772 (3) Å, and the closest distance between two atoms of these groups is 3.449 (4) Å. Since each Mo complex is engaged in two of these interactions, the complexes form an infinite π-stack coincident with the a axis.