The crystal structures of (η5-C5H4COMe)M(CO)3Me (M=Mo, W) have been determined. They are not isostructural. M=Mo is P21/c, a=10.205(6), b=14.192(8), c=8.135(6) Å, β=93.43(4)° and D(calc)=1.71 g cm-3 for Z=4. M=Wis P21/c, a=12.580(7), b=6.830(5), c=13.750(7) Å, β=93.72(4)° and D(calc)=2.20 g cm-3 for Z=4. Both have a four-legged piano stool geometry with the substituted carbon making the closest M-C(η5) approach. The methyl group in the M=W derivative is disordered between two trans-ligand positions. The average bonding parameters for the more accurately determined Mo analog are: Mo-C(η)5)=2.34(3) Å, Mo-CO=1.98(2) Å, Mo-Me=2.304(4) Å.
|Original language||English (US)|
|Number of pages||6|
|Journal||Journal of Crystallographic and Spectroscopic Research|
|State||Published - Dec 1 1990|