Photoinduced electron transfer in ionic liquids: use of 2,4,6-triphenylthiapyrylium as a photosensitizer probe.
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.
Marquis
Séverine
S
Departamento de Quìmica, Instituto de Tecnologìa CSIC-UPV, Universidad Politécnica de Valencia, Avda de los Naranjos s/n, 46022 Valencia, Spain.
Ferrer
Belén
B
Alvaro
Mercedes
M
García
Hermenegildo
H
Roth
Heinz D
HD