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Intermolecular quenching of the second excited state of some aromatic molecules

✍ Scribed by M.S.S.C. Leite; K. Razi Naqvi

Publisher: Elsevier Science
Year: 1969
Tongue: English
Weight: 453 KB
Volume: 4
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(69)85028-1

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✦ Synopsis

FIuorescence quenching of some polycyclic hydrocarbons in different solvents has been studied as a function of excitation wavelength. With most quenchers the Stern-Vobner quenching constant remafns fnsensitive to the wavelength of the irradiating beam. But when CC14 and CHCi3 are used as quenchers. the quenching constant obtained by populating the second excited state of the hydrocarbon is larger tbnn the corresponding value for the first excited state. However, excitation into the different vibrational sublevels of 2 particular electronic state does not affect the quenching constant. Quenching of the second excited state is ascribed to the formation of a solvated ion-pair.

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