| Concomitant Polymorphism in 3-Acetylcoumarin: Role of Weak C-H \cdot\cdot\cdot O and C-H \cdot\cdot\cdot \pi Interactions (2004) | |||||||||
Abstract | |||||||||
| 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 \cdot\cdot\cdot O and C-H\cdot\cdot\cdot \pi interactions stabilize one form in a head to head configuration, while only C-H\cdot\cdot\cdot O interactions stabilize the other in a head to tail configuration of the molecules in the crystal lattice. | |||||||||
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