Paper
Photochemistry of fluoro(trifluoromethyl)benzenes. II. Fluorescence spectra and quenching of singlet state emission in 1‐fluoro‐2‐, 1‐fluoro‐3‐, and 1‐fluoro‐4‐(trifluoromethyl)benzenes in the gas phase
Published Jul 1, 1973 · K. Al-ani
Journal of Chemical Physics
12
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Abstract
The fluorescence spectra of 1‐fluoro‐2‐(trifluoromethyl)benzene, 1‐fluoro‐3‐(trifluoromethyl)benzene, and 1‐fluoro‐4‐(trifluoromethyl)benzene were studied at various exciting wavelengths and pressures. At 248 nm the fluorescence spectra have so much structure that the appearances are essentially those of continua. At 266 nm, addition of 200 torr of cis ‐2‐butene or increase of aromatic pressure causes the bands around 270–275 nm to disappear. Addition of biacetyl or 1,3‐butadiene quenched the emission from the first excited state at 248, 253.7, and 265 nm. Butane and cis ‐2‐butene enhanced the fluorescent emission at 248 nm, while cis ‐2‐butene showed a small quenching of the fluorescent emission at 265 nm.
Fluorescence spectra of fluoro(trifluoromethyl)benzenes show structure and quenching of singlet state emission, with cis 2butene enhancing emission at 248 nm and cis 2butene showing small quenching at
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