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Anomalies in the fluorescence spectra of dual fluorescence molecules explained? A comparison of the time-resolved IR absorption of the CN band of photoexcited 4-dimethylaminobenzonitrile in MeCN and MeOH provides the first direct observation of the formation of a hydrogen-bonded intramolecular charge-transfer (ICT) state in MeOH and its coexistence with a “free” ICT state (see picture). The so-called dual fluorescence will be triple, not dual.
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Kwok et al. (2003) studied this question.
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