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Resonance energy transfer from the excited singlet state of dye molecules to a stable free radical

✍ Scribed by Shigeru Kohtani; Masako Murata; Michiya Itoh

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 374 KB
Volume: 247
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(95)01210-3

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✦ Synopsis

Fluorescence quenching of dye molecules such as coumarin 153, DCM and nile red by the stable 2,4,6-tri-tertbutylphenoxyl radical in an MTHF glass matrix at 77 K was studied by means of subnanosecond time-resolved fluorescence spectroscopy. The quenching process is ascribed to the dipole-dipole interaction amenable to FSrster theory. The average critical energy transfer distances were determined to be 20, 27 and 31 .~ for coumarin 153, DCM and nile red, respectively. These values are consistent with those evaluated from spectroscopic data.

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