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It was previously determined that CTX is the primary photoproduct of z\u2010chlorprothixene (CPTX) when irradiated at 313\u2003nm and is formed in an autocatalyzed reaction through an energy\u2010transfer mechanism (Pi\u00f1ero<jats:italic>et\u00a0al.<\/jats:italic>[2009]<jats:italic>Photochem. Photobiol<\/jats:italic>.,<jats:bold>85<\/jats:bold>, 895\u2013900). In this work, the photophysical properties of CTX were measured in acetonitrile\/water solutions to determine if their magnitude can affect the side effects of CPTX. The results show that CTX has higher absorption coefficients in the visible region (400\u2013420\u2003nm) and higher triplet quantum yields than its parent compound. Similar to TX, both properties strongly depend on the solvent polarity\/hydroxylicity. The quantum yield of the triplet intermediate is very close to the value of the phenothiazine triplets. The phenothiazines are the most phototoxic antidepressants. Therefore, given the appropriate microenvironment, the photosensitization side effects of CPTX can be intensified on the production of CTX.<\/jats:p>","DOI":"10.1111\/j.1751-1097.2011.00906.x","type":"journal-article","created":{"date-parts":[[2011,2,5]],"date-time":"2011-02-05T09:16:00Z","timestamp":1296897360000},"page":"611-617","source":"Crossref","is-referenced-by-count":19,"title":["Solvent Dependence of the Photophysical Properties of 2\u2010Chlorothioxanthone, the Principal Photoproduct of Chlorprothixene"],"prefix":"10.1111","volume":"87","author":[{"given":"Luis E.","family":"Pi\u00f1ero Santiago","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Carmelo","family":"Garc\u00eda","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Virginie","family":"Lhiaubet\u2010Vallet","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Miguel A.","family":"Miranda","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rolando","family":"Oyola","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2011,3,8]]},"reference":[{"key":"e_1_2_6_2_2","first-page":"165","article-title":"The antimicrobial activity of psychotherapeutic drugs and stereo\u2010isomeric analogues","volume":"37","author":"Kristiansen J. 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