@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

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    dct:description """
              The conformational equilibrium and thermodynamic parameters of <i>cis</i>-1,2-dicyano-1,2-bis(2,4,5-trimethyl-3-thienyl)ethene (<b>1a</b>) and its trans derivative <b>1c</b> are presented. Irradiation of both compounds was carried out by using 365 nm light, which affects the <i>cis/trans</i> isomerisation process, whereas irradiation with 405 nm light preferentially promotes the formation of the cyclised product. Prolonged irradiation of <b>1a</b> at 365 nm leads to the formation of a new derivative showing photochromic properties. Evidence for the formation of the novel derivative is presented, and details of its photochromic properties were investigated; a tentative mechanism has also been proposed. The equilibrium between parallel and antiparallel forms of cis- and trans-1,2-dicyano-1,2-bis(2,4,5-trimethyl-3-thienyl)ethene was studied by NMR spectroscopy. Photocyclisation or cis/trans isomerisation was induced by irradiation with 405 or 365 nm light. Extended irradiation of the cis compound generated two peroxy derivatives that thermally convert into a new coloured compound with its own photochromic properties.
            """ ;
    dct:identifier "hal-00920283" ;
    dct:issued "2026-05-07T18:25:36.450037"^^xsd:dateTime ;
    dct:language "en" ;
    dct:modified "2026-05-07T18:25:36.450041"^^xsd:dateTime ;
    dct:publisher <https://rec.harvest-normandie.data4citizen.com/organization/cce9db95-46d9-4dc2-84b6-764215d0a002> ;
    dct:title "Spectral, conformational and photochemical analyses of photochromic dithienylethene: <i>cis</i>-1,2-dicyano-1,2-bis(2,4,5-trimethyl-3-thienyl)ethene revisited" ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn "CCSD" ] ;
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    dcat:keyword "chimorgachemical-sciencesorganic-chemistry",
        "chimtheochemical-sciencestheoretical-andor-physical-chemistry",
        "conformation-analysis",
        "dithienylethene",
        "infoeu-reposemanticsarticle",
        "journal-articles",
        "peroxides",
        "photochemistry",
        "photochromism",
        "physphysphys-chem-phphysics-physicsphysics-physicschemical-physics-physicschem-ph" ;
    dcat:landingPage <ISSN:%201434-193X> .

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<https://rec.harvest-normandie.data4citizen.com/dataset/oai-hal-hal-00920283v1/resource/872b365a-42f5-4aac-9ec4-5e61ac2345be> a dcat:Distribution ;
    dct:format "HTML" ;
    dct:issued "2026-05-07T18:25:36.451410"^^xsd:dateTime ;
    dct:modified "2026-05-07T18:25:36.439677"^^xsd:dateTime ;
    dct:title "Spectral, conformational and photochemical analyses of photochromic dithienylethene: <i>cis</i>-1,2-dicyano-1,2-bis(2,4,5-trimethyl-3-thienyl)ethene revisited" ;
    dcat:accessURL <https://hal.science/hal-00920283> .

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