Issue 13, 2019

Polymorphism in p-aminobenzoic acid

Abstract

We review the polymorphism of p-aminobenzoic acid (pABA), a model drug compound whose crystallisation and polymorphic behaviour has been extensively studied in recent years. Beyond the well-known and characterised α and β forms, pABA also crystallises as a γ polymorph, which is structurally similar to the α form. In addition we also compare the newly reported δ form, obtained by high pressure crystallisation and through compression of the α-form. A structural analysis and comparison of all of the forms is presented, the conditions by which each of them is obtained summarised. Crystal structure prediction calculations have also been carried out in order to probe the solid form energy landscape of this compound. The overall picture of the polymorphism of pABA, reveals, surprisingly, the rarity of the β form.

Graphical abstract: Polymorphism in p-aminobenzoic acid

Article information

Article type
Highlight
Submitted
05 Nov 2018
Accepted
12 Jan 2019
First published
22 Jan 2019

CrystEngComm, 2019,21, 2034-2042

Polymorphism in p-aminobenzoic acid

A. J. Cruz-Cabeza, R. J. Davey, I. D. H. Oswald, M. R. Ward and I. J. Sugden, CrystEngComm, 2019, 21, 2034 DOI: 10.1039/C8CE01890A

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