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Concomitant polymorphism in 3-acetylcoumarin: Role of weak C-H⋯O and C-H⋯π interactions
, K.N. Venugopala, B.S. Jayashree, T.N. Guru Row
Published in
Volume: 4
Issue: 6
Pages: 1105 - 1107
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 polymorphe 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.
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