کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
177920 459006 2009 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The synthesis and photostability of novel squarylium indocyanine dyes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
The synthesis and photostability of novel squarylium indocyanine dyes
چکیده انگلیسی

Novel, water-soluble, squarylium indocyanine dyes with various N-substituents on 3H-indolenine were synthesized. The maxima of absorption and emission wavelengths of the dyes in different solvents were in the range 628–670 nm and exhibited negative solvatochromism with increasing solvent polarity in protic solvents. Dyes with N-benzyl rings (such as N-benzyl, N-carboxylbenzyl and N-fluorobenzyl) displayed greater photostability than dyes containing N-alkyl groups (such as N-ethyl and N-carboxylpentanyl) in aqueous solution. The electron-withdrawing group (such as carboxyl and fluoro group) on the N-benzyl group of cyanine dyes improved photostability compared to dyes that contained an electron-donating group (such as methyl). The fading constant k of the N-carboxylbenzyl dye was considerably lower than that of the N-carboxylpentanyl dye.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Dyes and Pigments - Volume 82, Issue 3, September 2009, Pages 396–400
نویسندگان
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