Abstract
R,S-Ibuprofen dissolved in chiral and achiral solvents recrystallizes at varied pressure and temperature in the same racemic form I of monoclinic space group P21/c. At 4.0 GPa the crystal is compressed to 78% of its ambient-pressure volume. The main structural transformation is the compression of intermolecular van der Waals contacts, increasing the effects of intermolecular interactions in the crystal environment, which results in the more skew position of OH···O bonded carboxyl groups and more stabile H-atoms in the bistable H-bonds. Consequently, the H-atoms remain ordered in all pressure ranges investigated, despite the compression of the H-bonds by over 0.1 Å at 4 GPa. The crystal compression and thermal expansion obey the reverse relationship rule of temperature and pressure effects; however, the compression is considerably nonlinear due to the strong reduction of void volume up to about 0.8 GPa.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
