期刊
TETRAHEDRON
卷 65, 期 11, 页码 2173-2177出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2009.01.048
关键词
Naphthalimides; Sultonation; Red-shifted absorption; Pyridinium salts
资金
- National Institutes of Health
As a minimum modification approach toward longer wavelength chromophores, a series of (4-diethylamino-1,8-naphthaloyl)-aminopyridines were prepared with the pyridine nitrogen located at the ortho. meta, and para positions. Comparison between these isomeric neutral dyes and their corresponding pyridinium-1,3-propanesulfonate salts reveals a red-shift in both absorption (up to air emission of 1682 cm(-1) in ethyl acetate) and emission. These observed shifts along with increased fluorescence quantum yield are attributed to polarization induced by the quaternary nitrogen of the pyridinium cation. Published by Elsevier Ltd.
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