Structure and bonding characteristics of bis(2,3-dicarnomethoxynorbornadiene)dicarbonylmolybdenum and related complexes |
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| Affiliation: | 1. Institute of Chemistry, Academia Sinica, Nankang, Taipei Taiwan;2. Department of Chemistry, National Taiwan University, Taipei, Taiwan;3. Research Institute of Applied Chemistry, Chinese Culture University, Taipei Taiwan;1. Departamento de Ingeniería Minera, Mecánica y Energética, Universidad de Huelva, 21819 Huelva, Spain;2. CARBOZULIA, Avenida 2 No. 55-185, Casa Mene Grande, Maracaibo 4002 A, Venezuela;3. Postgrado de Geología Petrolera, Facultad de Ingeniería, Universidad del Zulia, Maracaibo 10482, Venezuela;4. PDVSA, Calle 77, Edificio PDVSA 5 de Julio, Maracaibo 4002, Venezuela;5. Departamento de Explotación y Prospección de Minas, Universidad de Oviedo, C/G. Gutiérrez, 33600 Mieres, Spain |
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| Abstract: | ![]()
A crystal of bis(2,3-dicarbomethoxynorbornadiene)dicarbonylmolybdenum is in space group P21/c, with a 11.0406(25), b 14.7281(29), c 15.3310(27), β 110.38(2)° and Z = 4. Very large out-of-plane torsional angles (27–41°) for the vinylic carbomethoxy groups are observed. The bonding properties therefore are analyzed by comparison of spectroscopic data with those of related complexes, i.e. L2Mo(CO)2 where L = norbornadiene, 2-p-tosylnorbornadiene, and 2-carbomethoxynorbornadiene. Instead of σ-bond, metal to CC π-coordinations are believed to exist in these complexes. The presence of electron-withdrawing groups on the NBD ligands has increased their chelation strength, but at the same time has weakened the metalCO bonds. |
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