Nine supramolecular assemblies from 5,7-dimethyl-1,8naphthyridine-2-amine and carboxylic acids by strong classical H-bonds and other noncovalent associations

作者：Ding, Aihua; Jin, Shouwen^*; Jin, Shide; Guo, Ming; Liu, Hui; Guo, Jianzhong; Wang, Daqi

来源：Journal of Molecular Structure, 2017, 1150: 595-613.

DOI：10.1016/j.molstruc.2017.09.017

• Structure characterizations
• H-bond
• 5,7-Dimethy1-1,8-naphthyridine-2-amine
• Carboxylic acids
• Organic salts
• Supramolecular interactions

This article demonstrates 5,7-dimethyl-1,8-naphthyridine-2-amine based organic salt formation in nine crystalline solids 1-9, in which the carboxylates have been integrated. Addition of equivalents of the COOH to the solution of 5,7-dimethyl-1,8-naphthyridine-2-amine generates the singly protonated cationic species which direct the carboxylates. The nine compounds crystallize as their organic salts with the COOH proton transferred to the aromatic N of the 5,7-dimethyl-1,8-naphthyridine-2-amine. All salts have been characterized by IR, mp, EA and XRD technique. The major driving force in 1-9 is the classical H-bonds from 5,7-dimethyl-1,8-naphthyridine-2-amine and the acids, here the N N-H...O H-bonds were found in all salts. Other extensive non-covalent interactions also exhibit great functions in space association of the molecular counterparts in relevant crystals. Except 4, all salts had the CH-O, or CH3-O interactions or both. Except 9, the common R-2(2) (8) graph set has been observed in all salts due to the H-bonds and the non-covalent associations. For the synergistic interactions of the classical H-bonds and the various non-covalent associations, the salts displayed 1D-3D structures.

• 出版日期2017-12-15
• 单位浙江农林大学; 聊城大学