Bis(cyclopentadienylthallium)methane: A versatile intermediate for the synthesis of dinuclear cyclopentadienylmetal carbonyl complexes |
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| Affiliation: | 1. Department of Chemistry & Biochemistry, University of Mississippi, University, MS, United States;2. MS 245-3, NASA Ames Research Center, Moffet Field, CA, United States |
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| Abstract: | Bis(cyclopentadienylthallium)methane has been prepared from dicyclopentadienyl-methane and was shown to be a versatile starting material for the synthesis of a series of new dinuclear carbonylmetal complexes. Reactions of CH2(Cp-Tl)2 with carbonylhalometal complexes yielded CH2[CpMn(CO)3]2, CH2[CpFe(CO)Br]2, CH2[CpRu(CO)2Cl]2, CH2[CpRu(CO)2]2, CH2[CpRh(CO)2]2, CH2[CpRh(CO)]2-μ-CO, and CH2[CpIr(CO)2]2. Reduction of the iron and ruthenium halide derivatives was found to give the metalmetal bonded complexes, or the corresponding dianions depending on the time of reaction and the stoichiometry. The reaction of these dianions with methyl iodide to give the methyl derivatives is described. The facile decarbonylation of CH2[CpRh(CO)2]2 and carbonylation of CH2[CpRh(CO)]2-μ-CO appears to be a consequence of the proximity of the two metal atoms. In contrast, CH2[CpIr(CO)2]2 does not appear to form an analogous bridging compound under the reaction conditions. Complete spectral and physical data for the compounds are presented. |
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