Acta Cryst. (2014). C70, 323-325 [ doi:10.1107/S2053229614002447 ]
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-HO hydrogen-bonded dimers that are further linked by N-HO 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.
CCDC reference: 984821
Keywords: crystal structure; 4-aminobenzoic acid; PABA; polymorphism; noncentrosymmetric polymorph; hydrogen bonding; pharmaceuticals.
Chemical Markup Language (CML) file (2.7 kbytes)
To open or display or play some files, you may need to set your browser up to use the appropriate software. See the full list of file types for an explanation of the different file types and their related mime types and, where available links to sites from where the appropriate software may be obtained.
The download button will force most browsers to prompt for a file name to store the data on your hard disk.
Where possible, images are represented by thumbnails.