Abstract
At 77 K, 1,2,3,4-tetrahydroquinoline (THQ) forms a sinmple hydrogen bond with ethanol while at 300 K, a hydrogen-bonded ion pair is formed. Both intermolecular intersystem crossing and intramolecular singlet-triplet energy-transfer processes induced by heavy-atom-quencher dihalobenzenes are weak in ethanol at 300 K, and the overall fluorescence quenching is smaller in ethanol than in cyclohexane. In the methylcyclohexane rigid glass at 77 K, a triplet-state exciplex is formed between THQ and dihalobenzenes. In ethanol medium at 77 K, there is no reaction between the THQ-ethanol exciplex and dihalobenzenes involving the triplet state of THQ.
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