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 Fe 3(CO) 12 · AlBr 3, Ru 3(CO) 12 · AlBr 3 and Fe 2(CO) 9 · AlBr 3 are given.
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