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Heavy-atom effect on emission from free and hydrogen-bonded complexes of excited 1,2,3,4-tetrahydroquinoline

✍ Scribed by P. Jana; G.K. Mallik; T. Ganguly; S.B. Banerjee

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
386 KB
Volume
172
Category
Article
ISSN
0009-2614

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✦ Synopsis

At 77 K, 1,2,3+tetrahydroquinoline (THQ) forms a simple 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-atomquencher dihalobenzenes are weak in ethanol at 300 K, and the overall fluorescence quenching is smaller in ethanol than in cyclohexane. In 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 dihalobcnzenes involving the triplet state of THQ.

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