Synthesis and fluorescence properties of novel benzoxazole- and chromone-functionalised bis(arylvinylene)imidazoles / Yi-Feng Sun in COLORATION TECHNOLOGY, Vol. 128, N° 4 (2012)  

[article]  inCOLORATION TECHNOLOGY > Vol. 128, N° 4 (2012) . - p. 331-339 Titre : Synthesis and fluorescence properties of novel benzoxazole- and chromone-functionalised bis(arylvinylene)imidazoles Type de document : texte imprimé Auteurs : Yi-Feng Sun, Auteur ; Liu Zhong, Auteur ; Xian-Ming Hou, Auteur ; Shi-Ying Ma, Auteur ; Wen-Zeng Duan, Auteur ; Ren-Tao Wu, Auteur Année de publication : 2012 Article en page(s) : p. 331-339 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Synthèse Fluorescence Index. décimale : 667.2 Colorants et pigments Résumé : Novel benzoxazole- and chromone-functionalised bis(arylvinylene)imidazoles were synthesised and characterised by proton nuclear magnetic resonance, Fourier Transform–infrared, mass spectrometry and elemental analyses. These dyes were found to exhibit two quite different types of fluorescence behaviour in the alkali examined; i.e. fluorescence quenching for the benzoxazole–imidazole hybrids and fluorescence enhancement for the chromone–imidazole hybrids. The benzoxazole-based imidazoles emit intense green fluorescence, but the fluorescence is remarkably quenched upon addition of alkali. Such a process can be reversibly controlled by simple deprotonation/protonation of the imidazole group; thus, they exhibit efficient fluorescence on/off switchable behaviour. In contrast, significant fluorescence enhancement is observed for the chromone–imidazole hybrids in the presence of alkali. Without alkali, these imidazole dyes are very weakly fluorescent, whereas the addition of alkali leads to an appearance of strong blue fluorescence and a dramatic increase of emission intensity. Note de contenu : - EXPERIMENTAL : General - Synthesis of the 1,6-diaryl-hexa-1,5-diene-3,4-dione compounds - Synthesis of the functionalised bys(arylvinylene)imidazoles - X-ray crystallography - RESULTS AND DISCUSSION : Synthesis and characterisation - UV-vis absorption spectra - Fluorescence switching of benzoxazole-functionalised bis(arylvinylene)imidazoles (2a, 2b) - Fluorescence emission enhancement of chromone-functionalised bis(arylvinylene)imidazoles (2c, 2d) DOI : 10.1111/j.1478-4408.2012.00385.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2012.00385.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15683 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
14081	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Tunable solid-state fluorescence emission and red upconversion luminescence of novel anthracene-based fluorophores / Yi-Feng Sun in COLORATION TECHNOLOGY, Vol. 129, N° 3 (06/2013)  

[article]  inCOLORATION TECHNOLOGY > Vol. 129, N° 3 (06/2013) . - p. 165-172 Titre : Tunable solid-state fluorescence emission and red upconversion luminescence of novel anthracene-based fluorophores Type de document : texte imprimé Auteurs : Yi-Feng Sun, Auteur ; Zhi-Yong Chen, Auteur ; Li Zhu, Auteur ; Shu-Hong Xu, Auteur ; Ren-Tao Wu, Auteur ; Yi-Ping Cui, Auteur Année de publication : 2013 Article en page(s) : p. 165-172 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants Fluorescence Photoluminescence Semiconducteurs Index. décimale : 667.3 Teinture et impression des tissus Résumé : Novel, tunable solid-state emitters based on anthracene groups were synthesised and characterised by spectroscopy and elemental analysis. Their solid-state photoluminescence properties were studied. These fluorophores display interesting solid-state emission properties with an emission at wavelengths ranging from 550 to 650 nm when excited by a 325 nm helium–cadmium laser at room temperature. In particular, among them, 1,6-di(9-anthryl)hexa-1,5-diene-3,4-dione, 2-[4-(2-benzoxazolyl)phenyl]-4,5-bis[2-(9-anthryl)vinyl]-1H-imidazole and 2,3-bis[2-(9-anthryl)vinyl]quinoxaline show red, yellow and green emission, respectively, at 650, 584 and 550 nm. The results demonstrated that the luminescent colours can be tuned from red to yellow and green by simply varying molecular structure. Besides, 1,6-di(9-anthryl)hexa-1,5-diene-3,4-dione also exhibited an upconverted red fluorescent emission peak at around 675 nm under femtosecond excitation at 800 nm. Note de contenu : - MATERIALS AND METHODS : Materials and instrumental measurement - Synthesis of 1,6-diaryl hexa-1,5-diene-3,4-diones - Synthesis of the imidazoles - Synthesis of 2,3-bis[2-(9-anthryl)vinyl]quinoxaline - RESULTS AND DISCUSSION : Synthesis and characterisation - UV-vis absorption spectra - Photoluminescence spectra DOI : 10.1111/cote.12007 En ligne : http://onlinelibrary.wiley.com/doi/10.1111/cote.12007/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18485 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
15075	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 2 / 2)