Exciplex processes involving trans naphthylethylenes. Implications of ground-state conformeric equilibria
Five arylethylenes with 1-naphthyl, 2-naphthyl, and phenyl groups in 1,2-positions have been studied for singlet-mediated charge-transfer interactions with several amines and paraquat dication. 1-Phenyl-2-(2-naphthyl)ethylene and 1,2-di(2-naphthyl)ethylene exhibit distinct dependence of exciplex emission maxima and lifetimes, and fluorescence quenching constants, on excitation and/or monitoring wavelengths; this is in conformity with the existence of ground-state rotamers for these systems, wtih distinguishable absorption-emission spectra and fluorescence lifetimes. The fluorescence quenching by aromatic amines and paraquat dication occurs with rate constants in the limit of diffusion control and is accompanied by the formation of radical ions in polar solvents (acetonitrile). The transient spectra and kinetics associated with the radical ions, observed by 337.1- and 355-nm laser flash photolysis, are also reported. 10 figures, 4 tables.
- Research Organization:
- Univ. of Notre Dame, IN
- OSTI ID:
- 5960464
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 87:10; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
400500 -- Photochemistry
ACETONITRILE
ALKANES
ALKENES
AMINES
AROMATICS
AZINES
BENZENE
BIPYRIDINES
CATIONS
CHARGED PARTICLES
CONDENSED AROMATICS
CYCLOALKANES
DATA
ELECTROMAGNETIC RADIATION
EMISSION SPECTROSCOPY
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXPERIMENTAL DATA
FLUORESCENCE SPECTROSCOPY
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
INFORMATION
IONIZATION
IONS
LASER RADIATION
NITRILES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SOLVENTS
PHOTOIONIZATION
POLYCYCLIC AROMATIC HYDROCARBONS
PYRIDINES
RADIATIONS
RADICALS
SOLVENTS
SPECTROSCOPY