Perturbation of metal—metal stretching frequencies by the interaction of lewis acids with bridging carbonyls |
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| Authors: | DF Shriver S Onaka D Strope |
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| Institution: | Department of Chemistry, Northwestern University, Evanston, IL 60201 U.S.A. |
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| Abstract: | Adduct formation on the oxygen of a bridging carbonyl causes a very small perturbation of metal—metal stretching frequencies of polynuclear carbonyls. This small shift contrasts with the large change in v(MM) when carbonyl groups are redistributed between terminal and bridging positions; therefore, using low frequency Raman spectroscopy, it is possible to infer the structural relation of C- and O-bonded adduct to the parent carbonyl. Structural inferences for Fe3(CO)12 · AlBr3, Ru3(CO)12 · AlBr3 and Fe2(CO)9 · AlBr3 are given. |
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