Temperature effect on excited-state proton transfer reactions of β-carboline in different acetic-acid mixtures
The temperature dependence of the conjugated dual hydrogen bonding between β-carboline and guest molecules possessing a bifunctional hydrogen-bonding group is described in terms of their electrostatic interactions. In media with a high dielectric constant value, spectral analysis indicates the exist...
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| Published in | Chemical physics letters Vol. 301; no. 5; pp. 551 - 558 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier B.V
05.03.1999
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| Online Access | Get full text |
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| Summary: | The temperature dependence of the conjugated dual hydrogen bonding between β-carboline and guest molecules possessing a bifunctional hydrogen-bonding group is described in terms of their electrostatic interactions. In media with a high dielectric constant value, spectral analysis indicates the existence of neutral and cation species. When the solvent possesses a low dielectric constant, the system becomes much more complex, detecting up to five different species in the S
1 state in dichloromethane–acetic acid mixtures. Surprisingly, in all mixtures a shift of the prototropic process toward the cation was observed upon cooling from 310 K up to 200 K. |
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| ISSN: | 0009-2614 1873-4448 |
| DOI: | 10.1016/S0009-2614(99)00060-3 |