4-N,N-dimethylaminobenzonitrile: the absence of a1 fluorescence under jet-cooled conditions |
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| Affiliation: | 1. Institute of Nano Science and Nano Technology, University of Kashan, Kashan, P. O. Box 87317-51167, Islamic Republic of Iran;2. Department of Physics, University of Kashan, Kashan, P. O. Box 87317-51167, Islamic Republic of Iran;3. Department of Physics, University of Zabol, Zabol, P. O. Box 35856-98613, Islamic Republic of Iran;1. Institute of Physics NAS of Ukraine, 46 Nauki av., 03028 Kyiv, Ukraine;2. Institute of Macromolecular Chemistry NAS of Ukraine, 48 Kharkovskoe av., 02160 Kyiv, Ukraine |
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| Abstract: | ![]()
Excitation and dispersed fluorescence spectra and fluorescence lifetimes of jet-cooled 4-N,N-dimethylaminobenzonitrile (DMABN) and its van der Waals complex with methanol are reported. Neither the bare molecule nor the monosolvated complex exhibits the anomalous a fluorescence seen in polar solution. Multiple solvation of DMABN with methanol resulted in a dramatic reduction in fluorescence quantum yield which can be interpreted in terms of formation of an a state which is non-emissive under jet-cooled conditions. |
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