| Autor: |
Bhattacharyya, Pravat, Fawcett, John, H. Holloway, John, G. Hope, Eric, C. Saunders, Graham |
| Zdroj: |
Journal of the Chemical Society, Dalton Transactions; January 1997, Vol. 1997 Issue: 2 p199-204, 6p |
| Abstrakt: |
The arylimido complexes [Mo2O2(-NR)(-O)(η5-C5 H4Me)2] and [{MoO(-NR)(η5-C5H4Me)} 2] (R = C6H4F-2 or C6H4CF3-2) were obtained from the reaction between [{Mo(η5-C5H4Me)(CO)3 }2] and the appropriate nitrobenzene RNO2. In contrast, the corresponding reaction between O2NC6H3F2-2,6 and [{Mo(η5-C5H4Me)(CO)3 }2] generated two isomeric bis(imido) complexes [{MoO(-NC6H3F2-2,6)(η5 -C5H4Me)}2], which were separated by column chromatography. Hydrogen-1 and 19F NMR spectroscopic studies suggested that [{MoO(-NC6H4CF3-2)(η5 -C5H4Me)}2] exists in two chemically inseparable isomeric forms. The molecular structures of [Mo2O2(-NC6H4F-2)(-O)( η5-C5H4Me)2], [Mo2O2(-NC6H4CF3 -2)(-O)(η5-C5H4Me)2 ] and the centrosymmetric isomer of [{MoO(-NC6H4CF3-2)(η5 -C5H4Me)}2] have been determined by single-crystal X-ray diffraction. In each structure the central Mo2(-O)(-NR) or Mo2(-NR)2 core is planar with a trans configuration of methylcyclopentadienyl ligands and a substantial twist angle between the phenyl rings and the metallacycle planes. |
| Databáze: |
Supplemental Index |
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