Concomitant Polymorphism in 3-Acetylcoumarin:  Role of Weak C−H···O and C−H···π Interactions

An analysis of structural features associated with polymorphism in 3-acetylcoumarin has been made in terms of morphology, infrared spectroscopy, crystal structure, powder X-ray diffraction, and differential scanning calorimetric measurements. The appearance of concomitant polymorphs is found to depe...

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Bibliographic Details
Published in:Crystal growth & design 2004-11, Vol.4 (6), p.1105-1107
Main Authors: Munshi, Parthapratim, Venugopala, K. N, Jayashree, B. S, Guru Row, Tayur N
Format: Article
Language:English
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Summary:An analysis of structural features associated with polymorphism in 3-acetylcoumarin has been made in terms of morphology, infrared spectroscopy, crystal structure, powder X-ray diffraction, and differential scanning calorimetric measurements. The appearance of concomitant polymorphs is found to depend on the crystallization temperature in the 1:1 chloroform/hexane solvent system. C−H···O and C−H···π interactions stabilize one form in a head to head configuration, while only C−H···O interactions stabilize the other in a head to tail configuration of the molecules in the crystal lattice.
ISSN:1528-7483
1528-7505
DOI:10.1021/cg049948l