Peiqi Xing, Qingyun Li, Yingying Li
May 15, 2017
Citations
0
Influential Citations
13
Citations
Journal
Journal of Molecular Structure
Abstract
Abstract By using solvent evaporation method, 2,4,6-triaminopyrimidine (TAPI) is employed to crystallize with a variety of acids, including 3,5-dihydroxybenzoic acid (HDHBA), 3-nitrophthalic acid (H 2 NPA), 5-amino-2,4,6-triiodoisophthalic acid (H 2 ATIPIA), 2,5-dibromoterephthalic acid (H 2 DBTPA), 1,5-naphthalenedisulfonic acid (H 2 NDSA), sebacic acid (H 2 SA), 1,2,4-benzenetricarboxylic acid (H 3 BTA), and biphenyl-2,2′,5,5'-tetracarboxylic acid (H 4 BPTA). In all eight complexes, protons are completely exchanged from O atom of acid to nitrogen of TAPI in 1 , 3 , 4 , and, 5 , partly transferred in 2, 6, 7 , and 8 . The crystal structure of all eight complexes exhibit that classical robust hydrogen bonds X-H⋯X (X = O/N) direct the molecular crystals to bind together in a stacking modes. Classical hydrogen bond N H⋯O is participated in forming all eight organic salts, while hydrogen bonding O H⋯O are found in constructing the diversity structures in salts 1 , 2 , 3 , 4 , 6 , and 7 . The analysis shows that some classical supramolecular synthons, such as I R 2 2 (8), V R 2 4 (12), and VI S(6), are observed again in the construction of hydrogen-bonding networks. In the formation of layered and reticular structure, strong hydrogen bonds between water molecules and ligands having well-refined hydrogen atoms have been considered. Water molecules play an important role in building supramolecular structures of 1 , 2 , 3 , 4 , 7 , and 8 . Moreover, salts 1-8 are further characterized and analyzed by element analysis, infrared radiation, thermogravimetric analysis, proton nuclear magnetic resonance spectra, and mass spectra.