Polymorphism of 4′-Diethylamino-3-hydroxyflavone

Crystallization of 4′-diethylamino-3-hydroxyflavone (1) yields two polymorphic crystals. One is monoclinic, space group P21/n (1a), and the other triclinic, P1 (1b). In both crystals, the two adjacent molecules form a dimeric unit by two intermolecular O–H···O hydrogen bonds. The hydrogen-bonded dim...

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Bibliographic Details
Published in:	Bulletin of the Chemical Society of Japan Vol. 86; no. 6; pp. 721 - 723
Main Authors:	Hino, Kazuyuki, Nakajima, Kiyohiko, Kawahara, Miyoko, Furukawa, Kazuki, Sekiya, Hiroshi
Format:	Journal Article
Language:	English
Published:	Tokyo The Chemical Society of Japan 15-06-2013 Chemical Society of Japan
Online Access:	Get full text
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Summary:	Crystallization of 4′-diethylamino-3-hydroxyflavone (1) yields two polymorphic crystals. One is monoclinic, space group P21/n (1a), and the other triclinic, P1 (1b). In both crystals, the two adjacent molecules form a dimeric unit by two intermolecular O–H···O hydrogen bonds. The hydrogen-bonded dimer in crystal 1a is nearly planar, whereas that in crystal 1b is centrically twisted, having cis-like and trans-like conformations for the terminal carbon atoms at the diethylamino group.
ISSN:	0009-2673 1348-0634
DOI:	10.1246/bcsj.20130012