Archana, S. D. and Kavitha, C. N. and Yathirajan, H. S. and Foro, Sabine and Glidewell, Christopher (2021) Two 3-amino-1H-pyrazol-2-ium salts containing organic anions, and an orthorhombic polymorph of 3-amino-1H-pyrazol-2-ium nitrate. Acta Crystallographica Section E, 77 (1). pp. 34-41. ISSN 2056-9890
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Abstract
Co-crystallization from methanol of 3-amino-1H-pyrazole with 3,5-dinitrobenzoic acid produces 3-amino-1H-pyrazol-2-ium 3,5-dinitrobenzoate monohydrate, C3H6N3+·C7H3N2O6−·H2O, (I), while similar co-crystallization of this pyrazole with an equimolar quantity of fumaric acid produces bis(3-amino-1H-pyrazol-2-ium) fumarate–fumaric acid (1/1), 2C3H6N3+·C4H2O42−·C4H4O4, (II). The reaction of 3-amino-1H-pyrazole with a dilute solution of nitric acid in methanol yields a second, orthorhombic polymorph of 3-amino-1H-pyrazol-2-ium nitrate, C3H6N3+·NO3−, (III). In each of (I)–(III), the bond distances in the cation provide evidence for extensive delocalization of the positive charge. In each of (I) and (II), an extensive series of O—H⋯O and N—H⋯O hydrogen bonds links the components into complex sheets, while in the structure of (III), the ions are linked by multiple N—H⋯O hydrogen bonds into a three-dimensional arrangement. Comparisons are made with the structures of some related compounds.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | pyrazoles, organic salts, crystal structures, polymorphism, hydrogen bonding, supramolecular assembly |
| Subjects: | C Chemical Science > Chemistry |
| Divisions: | Department of > Chemistry |
| Depositing User: | C Swapna Library Assistant |
| Date Deposited: | 11 Dec 2020 10:25 |
| Last Modified: | 08 Jul 2021 10:27 |
| URI: | http://eprints.uni-mysore.ac.in/id/eprint/12136 |
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