Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9770047 | Journal of Molecular Structure | 2005 | 5 Pages |
Abstract
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.
Related Topics
Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Claus-Peter Jellen, Hans Bettermann,