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