- Bimolecular fluorescence quenching of benzoxazole/benzothiazole-based functional dyes
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Four dyes that belong to the group of hemicyanines and possess benzoxazole and benzothiazole moieties are synthesised and described. The spectroscopic properties of these compounds in 1-methyl-2-pyrrolidinone (MP) were studied. Synthesised dyes absorb in the UV–Vis region. The emission spectra are broad with a maximum located at approximately 500–520 nm. The deactivation of excited states of the synthesised molecules by various quenchers is also presented. The fluorescence quenching parameters were calculated using the Stern-Volmer equation. It was found, that the fluorescence quenching of the excited dye by quencher molecules occurs. The fluorescence quenching rates (kq) are about 1010 M?1 × s?1.
- Balcerak, Alicja,Kabatc, Janina
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- The photooxidative sensitization of bis(: P-substituted diphenyl)iodonium salts in the radical polymerization of acrylates
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The ability of two-component dyeing photoinitiating systems for the radical polymerization of 1,6-hexanediol diacrylate (HDDA) and 2-ethyl-2-(hydroxymethyl)-1,3-propanediol triacrylate (TMPTA) is presented. The systems under study comprised a hemicyanine dye as a sensitizer and iodonium salts that played a role of a coinitiator. The kinetic parameters of the polymerization reaction, such as the rate of polymerization (Rp) and the degree of conversion of monomer (C%), were estimated. The thermodynamic feasibility of an electron transfer process in the systems studied was verified and calculated using the Rehm-Weller equation. It was found that a benzoxazole derivative in the presence of iodonium salts effectively initiated the polymerization of acrylate monomers. The polymerization rates of about 10-7 s-1 and the degree of conversion of acrylate groups from 20% to 50% were observed. The effects of photoinitiator structures on the initiating ability and spectroscopic properties of sensitizers are described in this article.
- Balcerak, Alicja,Kabatc, Janina
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p. 28490 - 28499
(2019/09/30)
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- Crystallization-induced emission of styrylbenzoxazole derivate with response to proton
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A benzoxazole derivative called BVDA was synthesized. BVDA exhibited an AIE effect although there was H-aggregated dimer in the crystal. According to the spectral results and crystal structure, the presence of excimer and the restriction of intramolecular
- Xue, Pengchong,Yao, Boqi,Sun, Jiabao,Zhang, Zhenqi,Li, Kechang,Liu, Baijun,Lu, Ran
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p. 255 - 261
(2014/12/11)
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- Emission enhancement of a coplanar π-conjugated gelator without any auxiliary substituents
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A linear coplanar carbazole-based benzoxazole derivative without any auxiliary moieties could gelatinize organic solvents, and exhibited emission enhancement owing to the J-aggregate formation. This journal is the Partner Organisations 2014.
- Xue, Pengchong,Yao, Boqi,Sun, Jiabao,Zhang, Zhenqi,Lu, Ran
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supporting information
p. 10284 - 10286
(2014/08/18)
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- KF-Al2O3 catalyzed the condensations of 2-methylbenzoxazole and pyrazol-5-one with aromatic aldehydes
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In the presence of KF-Al2O3 as a solid base, 2-methylbenzoxazole 1 in DMF and 1-phenyl-3-methylpyrazol-5-one 2 in methanol, respectively, reacted with aromatic aldehydes to give 2-styrylbenzoxazoles 4a-f in high yields and 1-phenyl-3
- Sun,Yan,Han
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p. 151 - 154
(2007/10/03)
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- Facile synthesis of 1,2-diaryl- and triarylethenes with supported fluoride bases
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Differently substituted arenecarbaldehydes, mainly benzaldehydes, can be very efficiently condensed with a wide variety of methylbenzenes having an electron-withdrawing group in the para-position, as well as with fluorenes, xanthene, cyclopentadienes and indenes by using a standardized KF- or CsF-Al2O3 base system in dimethylformamide.
- Hellwinkel,Goke,Karle
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p. 973 - 978
(2007/10/02)
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- 2-STYRYLBENZOXAZOLE DERIVATIVES
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A series of 35 derivatives of 2-styrylbenzoxazole I-XXXV with methyl, chloro, hydroxy, methoxy, dimethylamino, nitro, cyano and methoxycarbonyl substituents have been prepared by reaction of substituted 2-acetamidophenol with respective benzaldehyde derivatives.
- Arient, Josef
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p. 3160 - 3165
(2007/10/02)
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