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Photochemical (quantum yields for ring closure and opening) and electrochemical (cyclic voltammetry) properties of the [ALIQUAT]<jats:sub>2<\/jats:sub>[DTE] and [P<jats:sub>6,6,6,14<\/jats:sub>]<jats:sub>2<\/jats:sub>[DTE] compounds as amorphous salts have been investigated. All compounds (including the di\u2010acid precursor and two RTILs) were studied in solution, in their intrinsically pure forms (RTIL as unique media) and in the solid state (BaSO<jats:sub>4<\/jats:sub> support). Combination with larger organic cations can stabilize the closed\u2010ring form, apparently avoiding the formation of by\u2010products without photodegradation. It is observed that the closed\u2010ring reaction is faster in the case of RTILs comparing to the di\u2010acid starting material. The coloration switches between transparent (initial state) to purple ([ALIQUAT]<jats:sub>2<\/jats:sub>[DTE]) or pink ([P<jats:sub>6,6,6,14<\/jats:sub>]<jats:sub>2<\/jats:sub>[DTE]). The novel diarylethene\u2010based RTILs as multi\u2010coloured photochromic materials can open attractive perspectives for materials science applications.<\/jats:p>","DOI":"10.1002\/cptc.201900028","type":"journal-article","created":{"date-parts":[[2019,6,21]],"date-time":"2019-06-21T05:15:00Z","timestamp":1561094100000},"page":"525-528","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Photochromic Room Temperature Ionic Liquids Based on Anionic Diarylethene Derivatives"],"prefix":"10.1002","volume":"3","author":[{"given":"No\u00e9mi","family":"Jord\u00e3o","sequence":"first","affiliation":[{"name":"LAQV-REQUIMTE, Departamento de Qu\u00edmica Faculdade de Ci\u00eancias e Tecnologia Universidade Nova de Lisboa  2829-516 Caparica Portugal"}]},{"given":"Pedro","family":"Ferreira","sequence":"additional","affiliation":[{"name":"LAQV-REQUIMTE, Departamento de Qu\u00edmica Faculdade de Ci\u00eancias e Tecnologia Universidade Nova de Lisboa  2829-516 Caparica Portugal"}]},{"given":"Hugo","family":"Cruz","sequence":"additional","affiliation":[{"name":"LAQV-REQUIMTE, Departamento de Qu\u00edmica Faculdade de Ci\u00eancias e Tecnologia Universidade Nova de Lisboa  2829-516 Caparica Portugal"}]},{"given":"A. 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