Abstract
The crystal structure of MoMe2(η6-C6H5)(PPhMe2)2 and MoMe2(η6-C6H5Me)(PPhMe2)2 have been determined from three-dimensional X-ray diffraction data collected by counter methods. The former crystallizes in the monoclinic space group P21/n with a= 8.108(4), b= 24.287(8), c= 11.961(5)A, β= 96.59(4)°, and Z= 4 for Dc= 1.36 g cm–3. The final R value was 0.035 based on 1 271 independent observed reflections. MoMe2(η6-C6H5Me)(PPhMe2)2 crystallizes in the triclinic space group P with a= 9.128(2), b= 9.611 (2), c= 14.842(3)A, α= 105.44(3), β= 93.72(3), γ= 102.47(3)°, and Z= 2 for Dc= 1.35 g cm–3. The R value was 0·019 for 3 586 observed reflections. The presence of the methyl group on the toluene ligand does not appreciably alter the electronic environment of the molybdenum atom. In the toluene derivative the two Mo–C(σ) bonds average 2.291 (5)A. The Mo–C(σ) lengths range from 2.250(2) to 2.344(2)A, and are seen to vary in a pair-wise fashion such that the arene shows a tendency to act as a diene.
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