期刊
DYES AND PIGMENTS
卷 82, 期 3, 页码 258-267出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2009.01.014
关键词
Coumarin; Solid-state fluorescence; X-ray crystallography
The solid-state fluorescence intensity of coumarin dyes depends on the substituents present at the 4- and 7-positions. 7-(Diethylamino)coumarins showed higher solid-state fluorescence quantum yield (Phi(f)(ss) = 0.29-0.40) than 7-aminocoumarins (0.01). In the case of julolydyl coumarins, a 4-methyltetramethyljulolydyl derivative also displayed high Phi(f)(ss) (0.34), this being greater than that observed for both 4-(perfluoroalkyl)tetramethyljulolydyl (0.09 and 0.10) and 4-methyljulolydyl derivatives (0.01). X-ray crystallographic analysis suggested that coumarin dyes bearing network hydrogen bonds and/or pi-pi stacking show weak solid-state fluorescence whereas coumarin dyes having isolated monomer- and dimer-type stacking show intense fluorescence. 4-(Perfluoroalkyl)tetramethyljulolydyl derivatives displayed medium fluorescence intensity owing to isolated monomer-type packing with little intermolecular interactions operating between adjacent Molecules. (C) 2009 Elsevier Ltd. All rights reserved.
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