Excited-state properties of trans-(9-anthryl)ethylenes. Effects of geometric distortion about single bond

Journal Article · Thu Jun 05 04:00:00 EDT 1986 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100403a017· OSTI ID:5568890

Bhattacharyya, K; Chattopadhyay, S K; Baral-Tosh, S; Das, P K

The singlet- and triplet-related photophysical properties of four trans-1,2-diarylethylenes, containing methyl, phenyl, 1-naphthyl, and 9-anthryl group as one substituent and 9-anthryl group as the other, have been studied by steady-state and time-correlated fluorescence measurements, laser flash photolysis, and pulse radiolysis. The results show pronounced effects of the photoexcitation-induced geometric distortion (about the anthryl-to-ethylene single bond) in rendering fluorescence and triplet-triplet absorption spectra broad and structureless, and in enhancing radiationless processes from singlets, triplets, and exciplexes (with N,N-dimethylaniline). The shortening of triplet lifetimes, and the triplet quenching behaviors toward ferrocene, di-tert-butylnitroxy radical, and oxygen, are also explainable in terms of the torsional relaxation; these effects are similar to, but less pronounced than, those arising from double bond twisting in smaller arylethylene triplets. No photophysical anomaly attributable to ground-state rotamerism is observed in fluid solutions.

• Research Organization: Univ. of Notre Dame, IN
• OSTI ID: 5568890
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:12; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
400500 -- Photochemistry
ABSORPTION SPECTROSCOPY
CHEMICAL REACTIONS
DATA
DE-EXCITATION
DECOMPOSITION
ELECTROMAGNETIC RADIATION
EMISSION SPECTROSCOPY
ENERGY LEVELS
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
EXPERIMENTAL DATA
FLUORESCENCE SPECTROSCOPY
INFORMATION
LASERS
MEDIUM TEMPERATURE
NUMERICAL DATA
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADIATIONLESS DECAY
RADIATIONS
SPECTROSCOPY
STRUCTURAL CHEMICAL ANALYSIS
VISIBLE RADIATION