Ribeiro Santos, André Ballardini, Roberto Belser, Peter Gandolfi, Maria Teresa Mahadevan Iyer, Vijay Moggi, Luca 2009-10-28 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. application/pdf https://folia.unifr.ch/global/documents/301356 https://folia.unifr.ch/documents/301356/files/belser_pip.pdf eng info:eu-repo/semantics/altIdentifier/doi/10.1039/b9pp00037b info:eu-repo/semantics/openAccess License undefined Photochemical & Photobiological Sciences. - 2009, vol. 8, p. 1734-1742 info:eu-repo/classification/udc/54 Photochemical investigation of a photochromic diarylethene compound that can be used as a wide range actinometer http://purl.org/coar/resource_type/c_6501