Crystal and molecular structure of dicarbonyl-π-cyclopentadienyl[tetrakis(pyrazol-1-yl)borato]molybdenum

Abstract

The crystal and molecular structure of the title compound has been determined from three-dimensional X-ray diffraction data measured by counter techniques. Crystals are monoclinic, space group C2/c with Z= 8 in a unit cell of dimensions a= 37·06(7), b= 8·747(10), c= 12·961 (16)Å and β= 93° 45(7)′. Solved from Patterson and Fourier syntheses, the structure was refined by full-matrix least-squares methods to R 9·2% for 1926 non-zero independent reflections. The tetrakis-(1-pyrazolyl)borate group acts as a bidentate ligand via co-ordination through one nitrogen atom from each of two pyrazolyl rings while the remainder of the molybdenum co-ordination sphere consists of two σ-bonded CO groups and the π-bonded C₅H₅ group.