کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9770047 | 1501939 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Measuring molecular aggregates in sub-attomolar solutions
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
This contribution presents fluorescence spectra of monomer and assembled tetratolylporphyrin molecules in ultralow concentrated solutions. The molecules were dissolved in acetone. Fluorescence signals could be detected from solutions whose concentration ranged from 10â14 to 10â19 M. The detection limit of molecular fluorescence emissions was found at 10â20 M. The molecular assemblies could be determined as J-aggregates in which the monomer units are shared along the y-axis (N-Hâ¯H-N) of the porphyrin coordinate system. Two different types of J-aggregates are present. One type appeared in freshly prepared solutions only and turned into the second stable form after few hours.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure - Volumes 744â747, 3 June 2005, Pages 121-125
Journal: Journal of Molecular Structure - Volumes 744â747, 3 June 2005, Pages 121-125
نویسندگان
Claus-Peter Jellen, Hans Bettermann,