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. 2009 Dec;8(12):1734-42.
doi: 10.1039/b9pp00037b. Epub 2009 Oct 28.

Photochemical investigation of a photochromic diarylethene compound that can be used as a wide range actinometer

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Photochemical investigation of a photochromic diarylethene compound that can be used as a wide range actinometer

André Ribeiro Santos et al. Photochem Photobiol Sci. 2009 Dec.

Abstract

The photochromic diarylethene derivative 1,2-bis(5-(4-ethynylphenyl)-2-methylthiophen-3-yl)perfluorocyclopentene (1) was submitted to photochemical, thermal stability and fatigue resistance studies in acetonitrile, also to evaluate its possible application as a new actinometer. This photochromic system covers a wide spectral absorption range, with intense bands in the UV and visible regions for the open-ring and closed-ring isomers, respectively. Very high ring-closure quantum yield values were obtained, in contrast with the low ring-opening quantum yields, which are nevertheless high enough to exploit 1 as an actinometer. The procedure required to determine the photon flux of an irradiation source with this fatigue resistant compound is indeed very simple.

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