The structural properties of a noncentrosymmetric polymorph of 4-aminobenzoic acid

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 center dot center dot center dot O hydrogen-bonded dimers that are further linked by N-H center dot center dot center dot 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.
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Acta Crystallographica Section C: Crystal Structure Communications, International Union of Crystallography, 2014, 70 (3), pp.323-U279. 〈10.1107/S2053229614002447〉
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Soumis le : jeudi 11 mai 2017 - 16:34:07
Dernière modification le : jeudi 11 janvier 2018 - 06:23:18

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Rim Benali-Cherif, Radhwane Takouachet, El-Eulmi Bendeif, Nourredine Benali-Cherif. The structural properties of a noncentrosymmetric polymorph of 4-aminobenzoic acid. Acta Crystallographica Section C: Crystal Structure Communications, International Union of Crystallography, 2014, 70 (3), pp.323-U279. 〈10.1107/S2053229614002447〉. 〈hal-01521320〉

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