Insights into supramolecular assembly formation of pyridine tetrazolium and aromatic acid assisted via hydrogen-bonding

Pyridyltetrazolium is an advantageous molecular precursor for its abundant coordination sites, which is adequate for the design of novel multi-dimensional structures. Three compounds of P-pyridyltetrazolium with 1,2,3-benzenetricarboxylic acid 1, M-pyridyltetrazolium with 1,2,3-benzenetricarboxylic acid 2, and P-pyridyltetrazolium with 2,3-dihydroxybenzoic acid 3 were synthesized and investigated. Compounds 1 and 2 indicated that the position of the coordination nitrogen atom will affect the structure of the supramolecule. Compound 1 finally formed a three-dimensional network through hydrogen bonds of O-H center dot center dot center dot O and O-H center dot center dot center dot N, whereas compound 2 formed a two-dimensional layered structure and water molecules play an important role in the construction of the two-dimensional layer. In addition to O-H center dot center dot center dot N hydrogen bond interaction, a weak C-H-C hydrogen bond also has significant effect on the construction of compound 3. Some main supramolecular synthons observed in three compounds were shown to construct most of these hydrogen bonding networks. The three compounds have been characterized by single crystal X-ray diffraction, H-1 nuclear magnetic resonance, infrared spectroscopy and thermogravimetric analysis (TGA). Furthermore, their supramolecular structures are fully analyzed. (C) 2020 Elsevier B.V. All rights reserved.