کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
176600 458949 2013 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Spectroscopical properties of a DTAF-labeled hydrophilic–hydrophobic copolymer in water and surfactant micelles
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Spectroscopical properties of a DTAF-labeled hydrophilic–hydrophobic copolymer in water and surfactant micelles
چکیده انگلیسی

Emulsion copolymerization of hydrophilic α-tert-butoxy-ω-vinylbenzyl-polyglycidol macromonomer with styrene yields core–shell microspheres and a water-soluble copolymer fraction. This copolymer has a higher content of hydrophilic polyglycidol attested by 1H NMR. Further information is acquired by labeling the copolymer with 5-(4,6-dichlorotriazinyl)aminofluorescein (DTAF) and making absorption and fluorescence studies. The acquired data on aqueous solution of labeled copolymer without (L) and with micelles of dodecyltrimethylammonium chloride (LD), sodium dodecylsulfate (LS) and hexaethyleneglycol mono n-dodecyl ether (LE) reveal that the dianionic and anionic tautomers of the DTAF-label are apparent and concordant with the recorded spectrophotometric pKa values. The emission intensities, quantum yields and lifetimes obey the sequence LE < LS < L < LD. They are along with the increasingly deprotonated forms of the fluorophore and unveil that the micelle-label interactions depend on the surfactant.


► The DTAF-labeled copolymer senses various aqueous and micellar media.
► Micelle-label interactions depend on the surfactant.
► The dianionic and anionic forms of the label are apparent depending on the system.
► The fluorescence quantum yield and lifetime increase with label deprotonation.
► The change of the quantum yields and lifetimes is: nonionic < anionic < water < cationic.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Dyes and Pigments - Volume 97, Issue 2, May 2013, Pages 347–352
نویسندگان
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