Marquis S, Ferrer B, Alvaro M, García H, Roth HD. Photoinduced Electron Transfer in Ionic Liquids: Use of 2,4,6-Triphenylthiapyrylium as a Photosensitizer Probe.
J Phys Chem B 2006;
110:14956-60. [PMID:
16869610 DOI:
10.1021/jp061904v]
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Abstract
The photochemistry of 2,4,6-triphenylthiapyrylium, TPTP+, in an ionic liquid, bmim-PF6, and in zeolite Y has been investigated and compared. Fluorescence spectroscopy was used to characterize the singlet excited state and to demonstrate singlet quenching by dicyclopentadiene, DCP, as an electron donor. Time-resolved laser spectroscopy documents generation of the triplet excited state, 3TPTP+, and reduction by DCP, generating the corresponding radical, TPTP*, and radical ion, DCP+*. The highly polar media stabilize the organic intermediates, causing them to be long lived.
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