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organic compounds
The first noncentrosymmetric polymorph of 4-aminobenzoic acid (PABA) is described. The two crystallographically independent PABA molecules form pseudocentrosymmetric O-H
O hydrogen-bonded dimers that are further linked by N-HO hydrogen bonds into a three-dimensional network.
O hydrogen-bonded dimers that are further linked by N-HO hydrogen bonds into a three-dimensional network.research papers
The crystal structures of two polymorphs of L-aspartic acid hydrochloride revealed three- and two-dimensional hydrogen-bonding networks for the triclinic and orthorhombic polymorphs, respectively. The polymorphs share common structural features; however, the conformations of the L-aspartate cations and the crystal packings are different.
