Deuterium isotope effects of excited-state and ground-state double-proton-transfer processes of the 7-azaindole h-bonded dimer in 3-methylpentane
It was confirmed that the excited-state tautomer, generated via photoinduced double proton transfer of the 7-azaindole H-bonded dimer, relaxes to the unstable (19.0 ..mu..s at 298 K; 183 ..mu..s at 172 K) ground-state tautomer, which is then converted into the 7-azaindole dimer (starting species) by transferring back two protons in the dark. Thus, a cyclic scheme consisting of excited-state and ground-state double-proton-transfer processes was evidenced. For the dual fluorescence spectra due to the dimer and its phototautomer, a large deuterium isotope effect was apparently observed at 130-200 K. The ground-state double-proton-transfer process also exhibits a significant deuterium isotope effect, which suggests quantum mechanical tunneling.
- Research Organization:
- Kanazawa Univ., Japan
- OSTI ID:
- 5629567
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:11; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400302* -- Organic Chemistry-- Isotope Effects-- (-1987)
AROMATICS
AZAARENES
AZOLES
DATA
DEUTERIUM COMPOUNDS
DIMERS
EMISSION SPECTROSCOPY
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
FLUORESCENCE SPECTROSCOPY
GROUND STATES
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
HYDROGEN TRANSFER
INDOLES
INFORMATION
ISOTOPE EFFECTS
ISOTOPE ENRICHED MATERIALS
LOW TEMPERATURE
MATERIALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PYRROLES
SPECTROSCOPY