Loading...
Thermal Behavior of Benzoic Acid/Isonicotinamide Binary Cocrystals
Buanz, A.B.M. Prior, T.J. Burley, J.C. Raimi-Abraham, B.T. Telford, Richard Hart, M. Seaton, Colin C. Davies, P.J. Scowen, Ian J. Gaisford, S.
Buanz, A.B.M.
Prior, T.J.
Burley, J.C.
Raimi-Abraham, B.T.
Telford, Richard
Hart, M.
Seaton, Colin C.
Davies, P.J.
Scowen, Ian J.
Gaisford, S.
Publication Date
26/05/2015
End of Embargo
Supervisor
Rights
(c) 2015 American Chemical Society. Full-text reproduced in accordance with the publisher's self-archiving policy.
Peer-Reviewed
Yes
Open Access status
openAccess
Accepted for publication
Institution
Department
Awarded
Embargo end date
Collections
Additional title
Abstract
A comprehensive study of the thermal behavior of the 1:1 and 2:1 benzoic acid/isonicotinamide cocrystals is reported. The 1:1 material shows a simple unit cell expansion followed by melting upon heating. The 2:1 crystal exhibits more complex behavior. Its unit cell first expands upon heating, as a result of C–H···π interactions being lengthened. It then is converted into the 1:1 crystal, as demonstrated by significant changes in its X-ray diffraction pattern. The loss of 1 equiv of benzoic acid is confirmed by thermogravimetric analysis–mass spectrometry. Hot stage microscopy confirms that, as intuitively expected, the transformation begins at the crystal surface. The temperature at which conversion occurs is highly dependent on the sample mass and geometry, being reduced when the sample is under a gas flow or has a greater exposed surface area but increased when the heating rate is elevated.
Version
Accepted manuscript
Citation
Buanz ABM, Prior TJ, Burley JC, Raimi-Abraham BT, Telford R et al (2015) Thermal Behavior of Benzoic Acid/lsonicotinamide Binary Cocrystals. Crystal Growth & Design. 15(7): 3249-3256.
Link to publisher’s version
Link to published version
Link to Version of Record
Type
Article