| Literature DB >> 24594727 |
Rim Benali-Cherif1, Radhwane Takouachet1, El Eulmi Bendeif2, Nourredine Benali-Cherif1.
Abstract
The crystal structure of a polymorph of 4-aminobenzoic acid (PABA), C7H7NO2, at 100 K is noncentrosymmetric, as opposed to centrosymmetric in the structures of the other known polymorphs. The two crystallographically independent PABA molecules form pseudocentrosymmetric O-H...O hydrogen-bonded dimers that are further linked by N-H...O hydrogen bonds into a three-dimensional network. The benzene rings stack in the b direction. The CO2 moieties are bent out slightly from the benzene ring plane.Entities:
Keywords: 4-aminobenzoic acid; PABA; crystal structure; hydrogen bonding; noncentrosymmetric polymorph; pharmaceuticals; polymorphism
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Year: 2014 PMID： 24594727 DOI： 10.1107/S2053229614002447
Source DB: PubMed Journal: Acta Crystallogr C Struct Chem ISSN： 2053-2296 Impact factor: 1.172