Abstract
In solvents with an oxygen atom such as EPA (ether-isopentane-ethanol 5:5:2 in volume ratio), ethanol, ethanol-water, and 2-methyltetrahydrofuran at 77 K, o-benzoylbenzoic acid (BBA) and methyl o-benzoylbenzoate (MBB) exhibit dual phosphorescences, and their decay curves can well be analyzed by biexponential functions with lifetimes almost equal to those of the triplet-triplet absorptions. Since phosphorescence excitation spectra in solvents stated above indicate the existence of two types of ground-state BBA (and MBB), we have proposed that the short-lived (T a ) and long-lived (T b ) triplet states are produced independently by excitation of the corresponding ground-state conformers
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