title: Photochemical investigation of a photochromic diarylethene compound that can be used as a wide range actinometer.
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.
authors.affiliation: Organic Chemistry Department, Complutense University, Madrid, Spain.
authors.forename: André
authors.initials: A
authors.lastname: Ribeiro Santos
authors.forename: Roberto
authors.initials: R
authors.lastname: Ballardini
authors.forename: Peter
authors.initials: P
authors.lastname: Belser
authors.forename: Maria Teresa
authors.initials: MT
authors.lastname: Gandolfi
authors.forename: Vijay Mahadevan
authors.initials: VM
authors.lastname: Iyer
authors.forename: Luca
authors.initials: L
authors.lastname: Moggi