Microwave measurements of the rotational spectrum for cyclopentadienyl—cobalt dicarbonyl

✍ Scribed by M.A. Roehrig; Qi-Qi Chen; S.T. Haubrich; S.G. Kukolich

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 428 KB
• Volume: 183
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(91)85103-4

✦ Synopsis

Rotational transitions in the 6-18 GHz range were measured for cyclopentadienyl-cobalt dicarbonyl (CpCo( Co),) using a Flygare-Balle type pulsed beam spectrometer. Splitting and additional transitions due to hindered internal rotation and cobalt quadrupolc coupling were observed in the spectrum. Analysis of the spectrum provided the rotational constants A= 1625( 20), 5= 1257(2) and C=876(2) MHz. This molecule appears to have a tenfold barrier to rotation ofthe -COG fragment about the Cs axis of the Cp group. The potential energy barrier to internal rotation is Y,,=O.82( 20) THz (0.3 kJ/mol). The value of the OC-Co-CO angle was found to bc 0= 98 (5)". This and other structure parameters will be compared with electron diffraction results. The "Co quadrupole coupling components are eQ9,,,,= 12(4) MHz and eQqM= 132(4) MHz.