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

被引：22

作者：

Benali-Cherif, Rim ^{[1
]}

Takouachet, Radhwane ^{[1
]}

Bendeif, El-Eulmi ^{[2
]}

Benali-Cherif, Nourredine ^{[1
]}

机构：

[1] Univ Abbes Laghrour Khenchela, Lab Struct Proprietes & Interact Interatom, Khenchela 40000, Algeria

[2] Univ Lorraine, Inst Jean Barriol, UMR CNRS 7036, Lab Cristallog Resonance Magnet & Modelisat,CRM2, F-54506 Vandoeuvre Les Nancy, France

来源：

ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS | 2014年 / 70卷

关键词：

crystal structure; 4-aminobenzoic acid; PABA; polymorphism; noncentrosymmetric polymorph; hydrogen bonding; pharmaceuticals; P-AMINOBENZOIC ACID; L-GLUTAMIC ACID; CRYSTALLIZATION; REDETERMINATION;

D O I：

10.1107/S2053229614002447

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：323 / U279

页数：7

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