Microwave measurements of the gas-phase molecular structure of cobalt tetracarbonyl hydride

Abstract
Microwave rotational spectra for six isotopomers of HCo(CO)4 were measured using a Flygare–Balle type spectrometer. Transitions were measured in the 4–10 GHz range. The data were analyzed to obtain rotational constants,59Co quadrupole coupling strengths, distortion constants and spin–rotation interaction strengths. The common isotopomer is clearly a symmetric top, with C 3v symmetry. For the common isotopomer B=1131.7212(9) MHz and eQq(59Co)=116.62(3) MHz. The rotational constants were used to determine the complete, three‐dimensional structure of this complex. The measured H–Co bond length of 1.52(2) Å is significantly shorter than the previous value from electron diffraction work. Other structural parameters for this complex are reported and discussed.

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