6-pyridinium benzo[a]phenazine-5-oxide derivatives as visible photosensitisers for polymerisation / Karolina Podemska in COLORATION TECHNOLOGY, Vol. 130, N° 4 (08/2014)  

[article]  inCOLORATION TECHNOLOGY > Vol. 130, N° 4 (08/2014) . - p. 250-259 Titre : 6-pyridinium benzo[a]phenazine-5-oxide derivatives as visible photosensitisers for polymerisation Type de document : texte imprimé Auteurs : Karolina Podemska, Auteur ; Radoslaw Podsiadly, Auteur ; Agnieszka Orzel, Auteur ; Anna Kowalska, Auteur ; Andrzej Marcinek, Auteur ; Jolanta Sokolowska, Auteur Année de publication : 2014 Article en page(s) : p. 250-259 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Synthèse Décoloration Photo-oxydation Photoamorceurs (chimie) Photochimie Polyaddition Triacrylate de triméthylolpropane Index. décimale : 667.3 Teinture et impression des tissus Résumé : Several 6-pyridinium benzo[a]phenazine-5-oxide derivatives have been synthesised and characterised by proton nuclear magnetic resonance spectroscopy and mass spectrometry. The spectroscopic and electrochemical properties of these dyes were examined. The dyes were used as reducible sensitisers for selected electron donors (phenylthioacetic acid, phenoxyacetic acid, N-phenylglycine, and ethyl 4-N,N-dimethylaminobenzoate) and as oxidisable sensitisers for electron acceptors (onium and N-alkoxypyridinium salts). These photoredox pairs were found to be effective visible-wavelength photoinitiators for the free radical polymerisation of trimethylolpropane triacrylate under visible light. The cationic photopolymerisation of cyclohexene oxide by the studied dyes and the onium salt photoredox pairs was ineffective. The obtained results are discussed on the basis of both free energy change for electron transfer to or from the benzo[a]phenazine dyes and the photochemical properties of the dyes, particularly their photobleaching. The proposed mechanism of dye fading is supported by density functional theory calculations and spectroscopic characterisation of the radical cation of the dye. Note de contenu : - Synthesis of 6-pyridinium benzo[a]phenzzine-5-oxide (2a) - Quantum chemical calculations - Photochemical experiments DOI : 10.1111/cote.12096 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12096 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21776 [article]

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Dyes based on the 6,7-dichloro-5,8-quinolinedione skeleton as new type II photoinitiators for radical polymerisation / Agnieszka Orzel in COLORATION TECHNOLOGY, Vol. 130, N° 3 (06/2014)  

[article]  inCOLORATION TECHNOLOGY > Vol. 130, N° 3 (06/2014) . - p. 185-190 Titre : Dyes based on the 6,7-dichloro-5,8-quinolinedione skeleton as new type II photoinitiators for radical polymerisation Type de document : texte imprimé Auteurs : Agnieszka Orzel, Auteur ; Radoslaw Podsiadly, Auteur ; Karolina Podemska, Auteur ; Rafal Strzelczyk, Auteur ; Jolanta Kolinska, Auteur ; Jolanta Sokolowska, Auteur Année de publication : 2014 Article en page(s) : p. 185-190 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Colorants -- Synthèse Electrochimie Oxydoréduction Photoamorceurs (chimie) Photochimie Polyaddition Résonance magnétique nucléaire Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : Several dyes based on the 6,7-dichloro-5,8-quinolinedione skeleton have been synthesised and characterised by proton nuclear magnetic resonance spectroscopy and electron ionisation mass spectrometry. The spectroscopic and electrochemical properties of these dyes were investigated. Photoredox pairs consisting of the synthesised dyes and commercially available hydrogen donors (2-mercaptobenzoxazole, 2-mercaptobenzothiazole, 2-mercaptobenzimidazole, and 2,5-dimercapto-1,3,4-thiadiazole) were tested for use as effective initiator systems for radical polymerisation of trimethylolpropane triacrylate with visible light. The efficiencies of these initiator systems are discussed in terms of the free energy change for the electron transfer process from the dye to the hydrogen donor. Note de contenu : - General - Synthesis of 6,7-dicholoro-5,8-quinolinedione - Synthesis of 6-(5-methoxyanilino)-7-chloro-5,8-quinolinedione - 6,11-dihydro-3-methoxy-pyrido[2,3-b]phenazine-6,11-dione II - Photochemical experiments DOI : 10.1111/cote.12083 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12083 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21446 [article]

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