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Communication | Special issue | Vol 84, No. 1, 2012, pp.315-321
Published online, 22nd July, 2011
DOI: 10.3987/COM-11-S(P)33
Solid-State Fluorescence Properties and Crystal Structures of 7-(Diethylamino)coumarin Derivatives

Kanji Kubo,* Taisuke Matsumoto, Keiko Ideta, Haruko Takechi, and Hajime Takahashi

*School of Dentistry, Health Sciences University of Hokkaido, Ishikari-Tobetsu, Hokkaido 061-0293, Japan


7-(Diethylamino)-3-phenylcoumarin (1) gave strong emission band at 477 nm in the solid state when excited at 400 nm, but ethyl 2-[7-(diethylamino)-2-oxo-2H-1-benzopyran-3-yl]-4-thiazolecarboxylate (2) had no fluorescence in solid state. The crystal structures of 1 and 2 were analyzed by X-ray crystallography. The crystal of 1 had intermolecular C-H···O, C-H···N and C-H···π interactions and that of 2 had intermolecular C-H···O, π···π, and S···π interactions.