Journal
JOURNAL OF FLUORESCENCE
Volume 18, Issue 1, Pages 41-49Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10895-007-0233-x
Keywords
proton transfer; quantum calculations; cryogenic; dipole
Funding
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [P01GM048130] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF NEUROLOGICAL DISORDERS AND STROKE [F31NS053399] Funding Source: NIH RePORTER
- NIGMS NIH HHS [P01 GM48130] Funding Source: Medline
- NINDS NIH HHS [F31 NS053399] Funding Source: Medline
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Pyrene-1-carboxy acid has a pK of 4 in the ground state, and a pK of 8 in the excited state. Fluorescence spectra of the acid and base forms are presented as a function of solvent and temperature. Ab initio quantum calculations indicate that the bond between the ring system and the carboxyl group has aromatic character that becomes stronger upon excitation. This stabilization helps to account for the increase in pK upon excitation.
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