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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Derivatives of 1,4-naphthoquinone as visible-light-absorbing one-component photoinitiators for radical polymerisation / Rafal Strzelczyk in COLORATION TECHNOLOGY, Vol. 131, N° 3 (06/2015)  

[article]  inCOLORATION TECHNOLOGY > Vol. 131, N° 3 (06/2015) . - p. 229-235 Titre : Derivatives of 1,4-naphthoquinone as visible-light-absorbing one-component photoinitiators for radical polymerisation Type de document : texte imprimé Auteurs : Rafal Strzelczyk, Auteur ; Radoslaw Podsiadly, Auteur Année de publication : 2015 Article en page(s) : p. 229-235 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Colorants -- Synthèse Naphtoquinone Photoamorceurs (chimie) Polyaddition Index. décimale : 667.2 Colorants et pigments Résumé : Bifunctional visible-light photoinitiators for free radical polymerisation based on a 1,4-naphthoquinone skeleton were synthesised and characterised using proton nuclear magnetic resonance spectroscopy and chemical ionisation mass spectrometry. Their basic spectroscopic properties, such as absorption and low-temperature phosphorescence spectra, and their red-ox properties were also measured. These initiators contain an appropriate electron/hydrogen donor group in the skeleton and do not require an additional coinitiator for initiation. During irradiation they act both as a triplet photosensitiser and as a hydrogen/electron donor. The ability of each naphthoquinone to act as a photoinitiator strongly depends on its chemical structure. These studies suggest that initiator radicals are generated from the triplet state in an intermolecular electron/hydrogen transfer reaction. Note de contenu : - EXPERIMENTAL : General - Synthesis - Photochemical experiments - RESULTS AND DISCUSSION : Synthesis and spectroscopic characterisation of dyes - Free radical polymerisation DOI : 10.1111/cote.12144 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12144 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24125 [article]

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Dyes based on a 1,4-naphthoquinone skeleton as new type II photoinitiators for radical polymerisation / Agnieszka M. Szymczak in COLORATION TECHNOLOGY, Vol. 129, N° 4 (08/2013)  

[article]  inCOLORATION TECHNOLOGY > Vol. 129, N° 4 (08/2013) . - p. 284–288 Titre : Dyes based on a 1,4-naphthoquinone skeleton as new type II photoinitiators for radical polymerisation Type de document : texte imprimé Auteurs : Agnieszka M. Szymczak, Auteur ; Radoslaw Podsiadly, Auteur ; Karolina Podemska, Auteur ; Jolanta Sokolowska, Auteur Année de publication : 2013 Article en page(s) : p. 284–288 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants Hydrogène Naphtoquinone Oxydoréduction Photoamorceurs (chimie) Triacrylate de triméthylolpropane Index. décimale : 667.3 Teinture et impression des tissus Résumé : Photoredox pairs consisting of 1,4-naphthoquinone dyes and commercially available hydrogen donors (2-mercaptobenzoxazole, 2-mercaptobenzothiazole, 2-mercaptobenzimidazole and 2,5-dimercapto-1,3,4-thiadiazole) are found to be effective initiator systems for the radical polymerisation of trimethylolpropane triacrylate under visible light. The efficiency of these initiator systems is discussed in terms of the free energy change for the electron transfer process from the dye to the hydrogen donor. The results show that the photoinitiation ability of tested photoredox pairs depends on the structure of both the dye and the hydrogen donor. DOI : 10.1111/cote.12030 En ligne : http://onlinelibrary.wiley.com/doi/10.1111/cote.12030/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19041 [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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Dyes based on the azo-1H-pyrrole moiety – synthesis, spectroscopic and electrochemical properties, and adsorption on TiO2 / Anna Maruszewska in COLORATION TECHNOLOGY, Vol. 132, N° 1 (02/2016)  

[article]  inCOLORATION TECHNOLOGY > Vol. 132, N° 1 (02/2016) . - p. 92-97 Titre : Dyes based on the azo-1H-pyrrole moiety – synthesis, spectroscopic and electrochemical properties, and adsorption on TiO2 Type de document : texte imprimé Auteurs : Anna Maruszewska, Auteur ; Radoslaw Podsiadly, Auteur Année de publication : 2016 Article en page(s) : p. 92-97 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse électrochimique Analyse spectrale Caractérisation Colorants -- Adsorption Colorants -- Chimie Colorants -- Synthèse Colorants azoïques Dioxyde de titane Index. décimale : 667.3 Teinture et impression des tissus Résumé : A series of novel azo dyes based on the azo-1H-pyrrole moiety were synthesised. The dyes were characterised in terms of their spectroscopic, electrochemical, and physicochemical properties. In these dyes, the electron-rich 1H-pyrrole moiety was assembled as Ï€-bridges in donor–acceptor Ï€-conjugated dye, and aminophenylimine fragments and the carboxyl group were used as donor and anchoring acceptor groups respectively. The dyes had adequate HOMO and LUMO levels that matched the conduction band of TiO2 and the redox potential of the electrolyte. The adsorption of these azo compounds with carboxyl group(s) on TiO2 was investigated. Experimental data showed that the introduction of two carboxyl groups could greatly enhance the adsorption efficiency of the studied dyes on TiO2. The sorption kinetics was measured for selected dyes derived from 5-aminoisophthalic acid. Results indicate that a pseudo-second-order equation can better describe the adsorption kinetics of these dyes on TiO2. Note de contenu : - EXPERIMENTAL : General - Synthesis of azopyrrole-2-carbaldehydes - Synthesis of dye 4a - RESULTS AND DISCUSSION : Synthesis and spectroscopic studies - Electrochemical properties - Adsorption studies DOI : 10.1111/cote.12192 En ligne : http://onlinelibrary.wiley.com/doi/10.1111/cote.12192/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25580 [article]

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Dyes derived from 1,4-naphthoquinone as initiators for radical and cationic photopolymerisation / Agnieszka Szymczak in COLORATION TECHNOLOGY, Vol. 128, N° 5 (2012)  

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Dyes derived from 3-formyl-2(1H)-quinolone – synthesis, spectroscopic characterisation, and their behaviour in the presence of sulfhydryl and non-sulfhydryl amino acids / Aleksandra Kowalska in COLORATION TECHNOLOGY, Vol. 131, N° 2 (04/2015)  

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Naphthoylenebenzimidazolone dyes as one-component photoinitiators / Rafal Strzelczyk in COLORATION TECHNOLOGY, Vol. 133, N° 2 (04/2017)  

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Naphthoylenebenzimidazolone sensitisers for photo-oxidisable free radical polymerisation with the aid of pyridinium salts / Jolanta Kolinska in COLORATION TECHNOLOGY, Vol. 124, N° 6 (2008)  

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Study of free radical polymerisation with dye photoinitiators containing a naphthoylenebenzimidazolone skeleton / Radoslaw Podsiadly in COLORATION TECHNOLOGY, Vol. 124, N° 2 (2008)  

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Synthesis and application of dyes derived from benz[cd]indol-2(1H)-one as visible-light-absorbing polymerisation photoinitiators / Rafal Strzelczyk in COLORATION TECHNOLOGY, Vol. 132, N° 4 (08/2016)  

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Synthesis and photochemical reaction of benzo[a]quinoxalino[2,3-c]phenazine dyes / Radoslaw Podsiadly in COLORATION TECHNOLOGY, Vol. 133, N° 6 (12/2017)  

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Synthesis and ultraviolet-visible spectroscopic and electrochemical analyses of dyes derived from 2-aminobenzothiazole, and study of their adsorption on titanium dioxide / Anna Maruszewska in COLORATION TECHNOLOGY, Vol. 130, N° 4 (08/2014)  

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