Abstract
Rotational transitions in the 6–18 GHz range were measured for cyclopentadienyl—cobalt dicarbonyl (CpCo(CO) 2) using a Flygare-Balle type pulsed beam spectrometer. Splitting and additional transitions due to hindered internal rotation and cobalt quadrupole coupling were observed in the spectrum. Analysis of the spectrum provided the rotational constants A=1625(20), B=1257(2) and C=876(2) MHz. This molecule appears to have a tenfold barrier to rotation of the —Co(CO) 2 fragment about the C 5 axis of the Cp group. The potential energy barrier to internal rotation is V 10=0.82(20) THz (0.3 kJ/mol). The value of the OCCoCO angle was found to be θ=98(5)°. This and other structure parameters will be compared with electron diffraction results. The 59Co quadrupole coupling components are eQq aa =12(4) MHz and eQq bb =132(4) MHz.
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