IR frequencies and intensities of the vibrational modes of Cx Hy fragments bonded to metal complexes. Relationship with structure,bonding and reactivity |
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| Affiliation: | 1. Department of Mechanical Engineering and Materials Science, Yale University, New Haven, CT 06511, USA;2. NASA Glenn Research Center, Cleveland, OH 44135, USA;3. Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH 44106, USA |
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| Abstract: | ![]()
The following organometallic complexes were studied as models of the coordination between metal atoms and different Cx Hy ligands: Co2Fe(CO)9(CCH2), Co2Ru(CO)9(CCH2), Os3(H)2(CO)9(CCH2) and Co2Fe(CO)9(CC(H)CH3) (η3-η2-vinylidene or μ3-η2-methylvinylidene group); Fe2(C5H5)2(CO)3(CCH2) (μ2-η1-vinylidene group); Os3(μ-H)(CO)9(CHCH2) (μ2-η2-vinyl group); CH3Mn(CO)5 (η1-methyl group); Os3(μ-H)2(Co)10(CH2) and Fe2(CO)8(CH2) (μ2-η1-methylene group); Co3(CO)9(CH) (μ3-methyne group); CO3(CO)9(CCH3) (μ3-η1-ethylidyne group); Os3(H)(CO)9(C2H) (μ3-η2-acetylide group). The infrared frequencies and intensities associated with the main vibrational modes of the ligands (CC and CH stretchings, CH deformations) were evaluated and compared with those of appropriate model molecules. Both the frequency and intensity data can be usefully correlated with structural parameters (e.g. CC and CH bond distances and HCH bond angles) and provide information on the charge distribution on the ligands. It is therefore possible to discuss the type of metal—ligand interaction and the balance between the σ and π contributions to the bond. |
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