111634-82-3Relevant academic research and scientific papers
Studies of molybdenum compounds. 6. Diaryl(2,2′-bipyridyl)dioxomolybdenum(VI) and related compounds
Schrauzer,Zhang, Xumu,Liu, Nan Hui,Schlemper
, p. 279 - 282 (2008/10/08)
The first σ-diaryl derivatives of the type R2Mo(O)2(bpy) (R = C6H5, 4-CH3OC6H4, 4-CH3C6H4, 4-ClC6H4, or 2-CH3C6H4; bpy = 2,2′-bipyridyl) are described. The Mo-C bonds in these compounds are labilized through a combination of steric and electronic effects arising from interactions of the Mo=O moieties with the aromatic π-electron systems and overcrowding due to the presence of the coordinated bpy. In the complex with R = 4-CH3OC6H4, the observed mean Mo-Csp2 bond lengths of 2.202 (3) A? are similar to the mean Mo-Csp3 bond lengths in the corresponding complex with R = C2H5. The aryl substituents adopt a conformation maximizing π-orbital overlap with one Mo=O moiety. This is possible only with distortions of the Mo-C-C bond angles. The π-orbital interactions affect the energies of first low-energy absorptions in the UV-vis spectra and of the IR νMo=O absorptions. Crystal data for (4-CH3OC6H4)2Mo(O)2(bpy): space group P1, a = 8.492 (2) A?, b = 11.340 (2) A?, c = 13.076 (2) A?, α = 65.8 (1)°, β = 78.9 (1)°, γ = 71.4 (1)°, Z = 2. The structure was solved and refined (2397 independent reflections above 2σ) to the final values of residual R(Fo) = 0.025 and Rw(Fo) = 0.032.
