A vibrational study of the diosmacyclobutene complex Os2(CO)8(μ2–η1,η1–C2H2): The use of organometallic complexes as vibrational models for chemisorbed ethyne

Literature Information

Publication Date 2004-01-27
DOI 10.1039/B309979B
Impact Factor 3.676
Authors

Christopher E. Anson, Norman Sheppard, Ryan Pearman, Sandra Koch


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Abstract

The vibrational frequencies of the diosmacyclobutene ring in Os2(CO)8(μ2–η1,η1–C2H2) (1) and its dideuterated isotopologue Os2(CO)8(μ2–η1,η1–C2D2) (1-d2) have been measured and assigned. A normal coordinate analysis shows that the CC bond is weakened relative to those in ethene and cis-disubstituted ethenes, whereas the Os–C bonds are stronger than M–C σ-bonds in related complexes, reflecting back-donation from the osmium d-orbitals into the carbon π*-orbitals in 1. The vibrational frequencies of 1 and other ethyne complexes are compared with the vibrational frequencies of ethyne chemisorbed on metal and silicon single-crystal surfaces.

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