Title
Photoreduction and light-induced triplet-state formation in a single-site fluoroalkylated zinc phthalocyanine Photoreduction and light-induced triplet-state formation in a single-site fluoroalkylated zinc phthalocyanine
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
London ,
Subject
Chemistry
Source (journal)
Journal of the Chemical Society: Dalton transactions. - London
Volume/pages
43(2014) :40 , p. 14942-14948
ISSN
1477-9226
ISI
000343023200005
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Electron-withdrawing perfluoroalkyl peripheral substituents enhance the photosensitizing properties of metal phthalocyanines while increasing their solubility, thus providing opportunities for advanced characterization of their catalytically-relevant excited states. Optical absorption and electron paramagnetic resonance (EPR) spectroscopy experiments reveal that red light induces the reduction of perfluoroisopropyl-substituted zinc(II) phthalocyanine (F64PcZn) dissolved in ethanol. A similar photoreduction does not occur in toluene. Furthermore, intense UV irradiation causes the photodegradation of F64PcZn in ethanol, but low power UV illumination favours the formation of the triplet excited state, a prerequisite for new photocatalytic applications. The UV-induced triplet state of F64PcZn is characterized using a combination of transient EPR experiments and DFT computations.
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