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Mechanism of the T1∼→S0 transition in heavy-atom-containing polymethine dyes

✍ Scribed by A.P. Darmanyan

Publisher
Elsevier Science
Year
1983
Tongue
English
Weight
481 KB
Volume
102
Category
Article
ISSN
0009-2614

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✦ Synopsis

The laser photolysis technique has been used for the investigation of temperature and solven effects on the triplet decay rate (k-f) of thiacubocyanine dyes containing I and Brat the meso position of the polymethine chain. At low temperatures, when X-T is virtually constant, the radiationless triplet-singlet transition occurs via Siebrand's mechanism. As the temperature is increased, the heat-activated transition over the potential barrier separating the triplet and the ground state becomes the basic triplet dewy mechanism.

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