Abstract

Carbon-13 NMR data for a range of iron group polynuclear acetylide complexes with μ 2-η 2, μ 3-η 2 and μ 4-η 2 alkynyl groups are presented. For doubly bridging μ 2-η 2-acetylides of Fe, Ru and Os, the C α resonance lies in the range 65–110 ppm downfield of TMS, while C β shifts cover the range 90–110 ppm. In μ 3-η 2-complexes C α lies in the region 115–220 ppm and is always downfield of C β (43–153 ppm). For μ 4-η 2-acetylides, C α, is also downfield of C β with values lying in the ranges 185–230 and 91–165 ppm, respectively. Comments on the most appropriate experimental parameters for the observation of 13C spectra of acetylides and techniques for assigning resonances are included.

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