The frequencies of the ν(CO) bands of W(CO)5L (L = pyridine and piperidine) in the lowest ligand field (LF) excited states have been obtained by fast time-resolved IR spectroscopy of the species dissolved in low-temperature glasses, and the shifts from the ground state indicate that the C–O bonds lengthen on excitation, contrary to the interpretation of the pre-resonance Raman spectroscopy on the ground state.
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Johnson et al. (1995) studied this question.
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