Abstract
A comparative study of the 1H and 13C n.m.r. spectra of complexes [M2(CO)6{(HC2H)2}](M = Fe, Ru, or Os) is reported. Carbon–carbon coupling constants have been observed for 13C-enriched acetylene samples of iron and ruthenium. In the ruthenium complex the T1 and nuclear Overhauser enhancement (n.O.e.) measurements of the 13C nuclei of the organic moiety allowed the calculation of the correlation time for the molecular reorientation; furthermore the T1 and n.O.e. data for the 1H nuclei povided an opportunity to estimate the HA–HX distance (CHA= CHX) in the metallacycle. An improvement in the evaluation of this distance has been gained by measuring the 1H spinlattice relaxation time in a highly deuteriated sample.
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