In order to find a highly sensitive fluorophore, 3-azolyl-7-diethylaminocoumarin derivatives were synthesized. Both the absorption and fluorescence maxima of the coumarin-thiazole compounds showed red shifts with increases of the molar absorptivities and fluorescence intensities, in comparison with those of the corresponding coumarin-oxazole compounds. Among them, 3-(5-ethoxycarbonyl-1,3-thiazol-2-yl)-7-diethylamino-2H-chromen -2-one (3e) was one of the most promising candidates as a fluorophore accessible for analytical purposes in the fields of analytical and biological chemistry.

Key indicatorsSingle-crystal X-ray study T = 123 K Mean (C-C) = 0.004 Å R factor = 0.117 wR factor = 0.226 Data-to-parameter ratio = 20.1 For details of how these key indicators were automatically derived from the article, see http://journals.iucr.org/e. # 2005 International Union of Crystallography Printed in Great Britain -all rights reservedThe title compound, C 36 H 58 N 2 O 3 , also known as a liquid crystalline material, has a phase sequence of crystal-smectic C-isotropic liquid. The two benzene rings are nearly coplanar with the central NNO group, and each paraffin chain has an all-trans conformation. The molecules form a tilted layer structure via intermolecular -, C-HÁ Á ÁO and C-HÁ Á Á interactions.

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Key indicatorsSingle-crystal X-ray study T = 123 K Mean (C-C) = 0.004 Å R factor = 0.057 wR factor = 0.162 Data-to-parameter ratio = 9.4For details of how these key indicators were automatically derived from the article, see