Synthesis and characterisation of benzothiazole-based solid-state fluorescent azo dyes / Ganapati S. Shankarling in COLORATION TECHNOLOGY, Vol. 126, N° 6 (2010)  

[article]  inCOLORATION TECHNOLOGY > Vol. 126, N° 6 (2010) . - p. 348-352 Titre : Synthesis and characterisation of benzothiazole-based solid-state fluorescent azo dyes Type de document : texte imprimé Auteurs : Ganapati S. Shankarling, Auteur ; Rajkumar N. Rajule, Auteur ; Yogesh A. Sonawane, Auteur ; Prakhar P. Kasture, Auteur Année de publication : 2010 Article en page(s) : p. 348-352 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Benzothiazoles Caractérisation Chimie analytique Chimie textile Colorants Colorants -- Synthèse Fibres polyesters Solubilité Solvants organiques Teinture -- Fibres textiles Tags : 'Teintures  azotées  fluorescentes  à  semi-conducteur'  'Solvant  organique'  Colorant  Caractérisation  Solubilité  'Coefficient  d'extinction  molaire'  Dichlorométhane  Chloroforme  Diméthylformamide  Tétrahydrofurane  'Sulfoxyde  diméthylique'  Polyester  'Teinture  de  dispersion'  Thermogravimétrie  'Résonance  magnétique  proton'  'Spectrométrie  masse'  Stabilité  thermique Index. décimale : 667.3 Teinture et impression des tissus Résumé : Novel solid-state fluorescent azo dyes containing a 2-[4-(dimethylamino)phenyl]benzo[d]thiazol-6-amine as the electron donor group were synthesised. These dyes showed a molar extinction coefficient in the range of 20 000–30 000 l/mol/cm. These compounds were characterised by strong solid-state fluorescence under long ultraviolet light (365 nm). Absorption and fluorescence spectra revealed that electron coupling originating from broad Ï€-electron delocalisation and the keto–enol form is responsible for the large Stokes shift. These dyes were readily soluble in common solvents such as dichloromethane, chloroform, dimethyl formamide, tetrahydrofuran and dimethyl sulphoxide and were characterised by means of elemental analysis, proton nuclear magnetic resonance and mass spectrometry. Thermogravimetric analysis of solid-state fluorescent dyes show thermal stability up to 270 °C and can therefore be used for polymer application. The coloristic properties of these dyes were evaluated on polyester by the disperse dyeing method. DOI : 10.1111/j.1478-4408.2010.00268.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2010.00268.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10246 [article]

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Synthesis, characterisation, and study of the photophysical properties of highly stable imidazole-based novel solid-state fluorescent azo colourants / Preetam N. Moolya in COLORATION TECHNOLOGY, Vol. 131, N° 2 (04/2015)  

[article]  inCOLORATION TECHNOLOGY > Vol. 131, N° 2 (04/2015) . - p. 104-109 Titre : Synthesis, characterisation, and study of the photophysical properties of highly stable imidazole-based novel solid-state fluorescent azo colourants Type de document : texte imprimé Auteurs : Preetam N. Moolya, Auteur ; Balu L. Gadilohar, Auteur ; Ganapati S. Shankarling, Auteur Année de publication : 2015 Article en page(s) : p. 104-109 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale Caractérisation Colorants -- Propriétés thermiques Colorants -- Solubilité Colorants -- Synthèse Colorants azoïques Fluorescence Index. décimale : 667.3 Teinture et impression des tissus Résumé : Novel solid-state fluorescent azo colourants derived from 5-amino-2-(4-dimethylaminophenyl) benzimidazole as electron donor were synthesised. The colourants were characterised by means of elemental analysis, 1H NMR, and mass spectrometry. These colourants showed molar extinction coefficients in the range 12 000–48 000 dm3 mol?1 cm?1. These compounds exhibited solid-state fluorescence under short UV (254 nm). Electron coupling originating from broad ?-electron delocalisation and keto–enol form is responsible for the large Stokes shift as indicated by absorption and fluorescence spectra. These colourants were soluble in polar aprotic high-boiling solvents such as N,N-dimethylformamide, N,N-dimethylacetamide, and dimethyl sulphoxide, whereas they were insoluble in other common organic solvents. Thermogravimetric analysis of solid-state fluorescent colourants showed that two of the colourants showed thermal stability in the range 230–240 °C, whereas for the rest of the colourants it was found to be lower, and hence the two colourants could find application in the coloration of polymers. Note de contenu : - EXPERIMENTAL : Materials and equipment - Chemical synthesis - RESULTS AND DISCUSSION : Synthesis of solid-state fluorescent azo colourants - Spectroscopic properties of colourants 4a-4e - Thermal properties of the colourants - Solid-state fluorescence DOI : 10.1111/cote.12128 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12128 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23657 [article]

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The synthesis, photophysical and thermal properties of new anthrapyrimidine colorants / Sreejit R. Menon in COLORATION TECHNOLOGY, Vol. 127, N° 6 (2011)

[article]  inCOLORATION TECHNOLOGY > Vol. 127, N° 6 (2011) . - p. 383-389 Titre : The synthesis, photophysical and thermal properties of new anthrapyrimidine colorants Type de document : texte imprimé Auteurs : Sreejit R. Menon, Auteur ; Ganapati S. Shankarling, Auteur Année de publication : 2011 Article en page(s) : p. 383-389 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anthrapyrimidine Colorants Diméthylsulfoxyde Photostabilité Polypropylène Solvatochromisme Teinture -- Fibres textiles synthétiques Index. décimale : 667.3 Teinture et impression des tissus Résumé : The thermal and photostability of novel anthrapyrimidine-containing colorants obtained by the condensation of various substituted aromatic amines with 6-bromo-7H-benzo[e]perimidin-7-one are described. The colorants were characterised by proton nuclear magnetic resonance, elemental analysis and mass spectra. Thermogravimetric analysis showed that these colorants are thermally stable up to 250 °C. The UV–visible absorption spectra of the colorants were studied in solvents of differing polarity; the colorants exhibited slight positive solvatochromism. The photostability studies in dimethyl sulphoxide solvent were recorded by monitoring photodegradation of the colorants spectrophotometrically using a standard calibration curve. All the colorants exhibited excellent photostability. The light fastness study of two colorants in polypropylene showcases their ability as useful colorants for plastics. Note de contenu : - EXPERIMENTAL : Materials and analysis - Synthesis of 1-amino-4-bromo-anthraquinone - Synthesis of 6-bromo-7H-benzo[e]perimidin-7-one - Synthesis of colorants (5a-5e) - RESULTS AND DISCUSSION : Synthesis of anthrapyrimidine colorants - Photophysical properties of colorants 5a-5e - Thermal stability of colorants 5a-5e - Photostability of colorants 5a-5e - Light fastness of colorants 5c and 5e extruded with polypropylene DOI : 10.1111/j.1478-4408.2011.00330.x Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12652 [article]

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