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A method of determination of quantum yields of S 3 ⇝ S 2 , S 3 ⇝ S 2 , S 3 ⇝ S 1 , S 3 ⇝ S 1 , and S 3 ⇝ S 0 S 3 ⇝ S 0 intramolecular radiationless transitions



An effective method for determination of the quantum yields of the S 3 ⇝ S 2 , S 3 ⇝ S 2 , S 3 ⇝ S 1 S 3 ⇝ S 1 and S 3 ⇝ S 0 S 3 ⇝ S 0 intramolecular radiationless transitions, based on steady-state measurements of absorption, S 2 S 2 fluorescence and T 1 T 1 phosphorescence or S 1 S 1 fluorescence under selective excitation to the S 2 S 2 and S 3 S 3 states has been described and used for three aromatic thioketones. The results show that in the compounds studied the deactivation of the S 3 S 3 state is not strictly sequential and the S 3 ⇝ S 1 S 3 ⇝ S 1 as well as, unexpectedly, S 3 ⇝ S 0 S 3 ⇝ S 0 transitions occur with relatively high yields. Measurement of the quantum yields of S 3 ⇝ S 2 , S 3 ⇝ S 2 , S 3 ⇝ S 1 , S 3 ⇝ S 1 , and S 3 ⇝ S 0 S 3 ⇝ S 0 intramolecular radiationless transitions is essential for the determination of the intramolecular properties of molecules in the S 3 S 3 state as well as pathways of their decay. © 1999 American Institute of Physics.



The Journal of Chemical PhysicsAmerican Institute of Physics

Published: Nov 8, 1999

Keywords: intramolecular mechanics; nonradiative transitions; fluorescence; phosphorescence; excited states

DOI: 10.1063/1.480214

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