Issue 40, 2014

Photoreduction and light-induced triplet-state formation in a single-site fluoroalkylated zinc phthalocyanine

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.

Graphical abstract: Photoreduction and light-induced triplet-state formation in a single-site fluoroalkylated zinc phthalocyanine

Supplementary files

Article information

Article type
Paper
Submitted
28 Feb 2014
Accepted
22 Apr 2014
First published
22 Apr 2014

Dalton Trans., 2014,43, 14942-14948

Author version available

Photoreduction and light-induced triplet-state formation in a single-site fluoroalkylated zinc phthalocyanine

H. Moons, A. Loas, S. M. Gorun and S. Van Doorslaer, Dalton Trans., 2014, 43, 14942 DOI: 10.1039/C4DT00621F

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