Polymorphism and structural mechanism of the phase transformation of phenyl carbamate (PC) |
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Authors: | Wishkerman Sara Bernstein Joel |
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Institution: | Department of Chemistry, Ben-Gurion University of the Negev, P.O. Box 653 Beer Sheva, 84105, Israel. |
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Abstract: | Crystallization experiments with phenyl carbamate as a hydrogen-bond donor with crown ethers have led to the discovery of three unknown polymorphs of phenyl carbamate. In this contribution, we characterize the phenyl carbamate polymorphs by a variety of methods including variable temperature powder X-ray diffraction (PXRD), vibrational spectroscopy (infrared and Raman), calorimetry (DSC) and optical microscopy (HSM). The phase transformation from form I to form II is rapid by both solution-mediated and solid state transformation processes. Through comparison of the two structures of form I and form II it is possible to propose a mechanism for the transformation. |
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Keywords: | hydrogen bonds phenyl carbamate polymorphism X‐ray diffraction |
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