Salt and ionic cocrystalline forms of amides : protonation of carbamazepine in aqueous media

Buist, Amanda R. and Edgeley, David S. and Kabova, Elena A. and Kennedy, Alan R. and Hooper, Debbie and Rollo, David G. and Shankland, Kenneth and Spillman, Mark J. (2015) Salt and ionic cocrystalline forms of amides : protonation of carbamazepine in aqueous media. Crystal Growth and Design, 15. pp. 5955-5962. ISSN 1528-7483 (https://doi.org/10.1021/acs.cgd.5b01223)

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Abstract

The products of reactions of the pharmaceutical amide carbamazepine (CBZ) with strong acids under aqueous conditions were investigated by both powder and single crystal X-ray diffraction. Despite previous claims to the contrary, it was found that salt forms with CBZ protonated at the amide O atom could be isolated from reactions with both HCl and HBr. These forms include the newly identified hydrate phase [CBZ(H)][Cl].H2O. Reactions with other mineral acids (HI and HBF4) gave ionic cocrystalline (ICC) forms (CBZ.[acridinium][I3].2.5I2 and CBZ.[H5O2]0.25[BF4]0.25.H2O) as well as the salt form CBZ.[CBZ(H)][BF4].0.5H2O. Reaction of CBZ with a series of sulfonic acids also gave salt forms, namely [CBZ(H)][O3SC6H5], [CBZ(H)][O3SC6H4(OH)].0.5H2O, [CBZ(H)]2[O3SCH2CH2SO3] and [CBZ(H)][O3SC6H3(OH)(COOH)].H2O. CBZ and protonated CBZ(H) moieties can be differentiated in the solid state both by changes to molecular geometry and by differing packing preferences.

  • Item type:Article
    ID code:54716
    Dates:
    Date
    Event
    28 October 2015
    Published
    28 October 2015
    Published Online
    28 October 2015
    Accepted
    Notes:This document is the unedited author's version of a Submitted Work that was subsequently accepted for publication in Crystal Growth and Design, copyright © American Chemical Society after peer review. To access the final edited and published work, see http://www.dx.doi.org/10.1021/acs.cgd.5b01223 .
    Subjects:Science > Chemistry
    Department:Faculty of Science > Pure and Applied Chemistry
    Depositing user: Pure Administrator
    Date deposited:11 Dec 2015 01:19
    Last modified:08 Apr 2024 22:35
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/54716
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