Hydrogen-bonding Networks in Cocrystal of Melamine and 4-Fluoro-benzoic Acid

Chemical Research in Chinese Universities ›› 2010, Vol. 26 ›› Issue (5): 702-706.

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Hydrogen-bonding Networks in Cocrystal of Melamine and 4-Fluoro-benzoic Acid

ZHANG Xiu-lian*, YIN Wei and CAO Man-li

Department of Chemistry, Guangdong Institute of Education, Guangzhou 510310, P. R. China

Received:2009-08-19 Revised:2009-10-16 Online:2010-09-25 Published:2010-11-26
Contact: ZHANG Xiu-lian. E-mail: zxl@gdei.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(No.20972178) and a Grant for Key Research Items in Na- tural Science of Guangdong Higher Education Institutions of China(No.06Z027).

Abstract

Abstract: A novel interpenetrating structure [(HMA+)(FB–)]·2H2O of melamine(MA) with 4-fluoro-benzoic acid (HFB) was synthesized. It crystallized in the monoclinic system with space group P21/c. The complex has a interpenetrating 2D structure with hydrogen-bonded grid networks. Carboxylic acid to melamine proton transfer occurs in the complex. The adjacent HMA+ cations related by an inverse center form cationic [HMA+]∞ ribbons via a pair of N―H???N hydrogen bonds. Adjacent FB– anions are paired by C―H???F hydrogen bonds to form dimers, which are connected to [HMA+]∞ ribbons through N―H???O interactions. The supramolecular features in the complex are guided by control of strong N―H???N, N―H???O and O―H???O hydrogen bonds, as well as highly directional weak C―H???F interactions and aromatic ? ???? stacking interactions.

Key words: Hydrogen bond, Melamine, 4-Fluoro-benzoic acid

ZHANG Xiu-lian*, YIN Wei and CAO Man-li. Hydrogen-bonding Networks in Cocrystal of Melamine and 4-Fluoro-benzoic Acid[J]. Chemical Research in Chinese Universities, 2010, 26(5): 702-706.

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Hydrogen-bonding Networks in Cocrystal of Melamine and 4-Fluoro-benzoic Acid

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