Abstract
Polarized spectra with rich vibrational detail are reported for two faces of single crystals of Mo/sub 2/(O/sub 2/CCH/sub 3/)/sub 4/ at temperatures down to 5 K. Evidence, which includes the orientation in space of transition moments for individual vibrational lines, hot bands, and Franck-Condon factors, is presented that the 23,000-cm/sup -1/ band is the electric-dipole-allowed /sup 1/A/sub 2u/ reverse arrow /sup 1/A/sub 1g/ or delta* reverse arrow delta with an origin at 21,700 cm/sup -1/. However, the intensities are sufficiently low that lines excited vibronically, although somewhat weaker, approach the intensity of the dipole-allowed progression. A second transition at 26,500 cm/sup -1/ is evident as well from the low-temperature spectra. The spectra of a number of dimeric carboxylate complexes of molybdenum(II) are compared and the possible cause of the exceptionally low intensity for an electric-dipole-allowed transition is discussed.
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