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Polymorphism and Structural Mechanism of the Phase Transformation of Phenyl Carbamate (PC)
Author(s) -
Wishkerman Sara,
Bernstein Joel
Publication year - 2007
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200700463
Subject(s) - polymorphism (computer science) , carbamate , raman spectroscopy , crystallography , crystallization , powder diffraction , hydrogen bond , differential scanning calorimetry , chemistry , infrared spectroscopy , phase (matter) , calorimetry , transformation (genetics) , materials science , molecule , organic chemistry , thermodynamics , physics , genotype , biochemistry , optics , gene
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.