Syntheses, crystal structures and Hirshfeld surface analyses of four mol­ecular salts of amitriptynol

Vinaya and Anil Kumar, H. G. and Mohan Kumar, T. M. and Lakshmana, B. and Basavaraju, Y. B. and Yathirajan, H. S. and Parkin, Sean (2023) Syntheses, crystal structures and Hirshfeld surface analyses of four mol­ecular salts of amitriptynol. Acta Crystallographica Section E, 79 (5). pp. 451-457. ISSN 2056-9890

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Official URL: https://doi.org/10.1107/S2056989023003225

Abstract

The syntheses and crystal structures of four salts of amitriptynol (C20H25NO) with different carb­oxy­lic acids are described. The salts formed directly from solutions of amitriptyline (which first hydrolysed to amitriptynol) and the cor­responding acid in aceto­nitrile to form amitriptynolium [sys­tem­atic name: (3-{2-hy­droxy­tri­cy­clo[9.4.0.03,8]penta­deca-1(11),3,5,7,12,14-hexa­en-2-yl}pro­pyl)di­methyl­az­an­ium] 4-meth­oxy­benzoate monohydrate, C20H26NO+·C8H7O3−·H2O, (I), ami­triptynolium 3,4-di­meth­oxy­benzoate trihydrate, C20H26NO+·C9H9O4−·3H2O, (II), amitriptynolium 2-chloro­benzoate, C20H26NO+·C7H4ClO2−, (III), and amitriptynolium thio­phene-2-carboxyl­ate monohydrate, C20H26NO+·C5H3O2S−·H2O, (IV). Compound (III) crystallizes with two cations, two anions and six water mol­ecules in the asymmetric unit. The different conformations of the amitriptynolium cations are determined by the torsion angles in the di­methyl­amino-propyl chains and the –CH2–CH2- bridge between the benzene rings in the tricyclic ring system, and are complicated by disorder of the bridging unit in II and III. The packing in all four salts is dominated by N—H⋯O and O—H⋯O hydrogen bonds. Hirshfeld surface analyses show that the amitriptynolium cations make similar inter-species contacts, despite the distinctly different packing in each salt.

Item Type: Article
Uncontrolled Keywords: amitriptynol, amitriptyline, hydrogen bonding, Hirshfeld-surface analysis, crystal structure
Subjects: C Chemical Science > Chemistry
Divisions: Department of > Chemistry
Depositing User: C Swapna Library Assistant
Date Deposited: 29 Apr 2023 04:09
Last Modified: 29 Apr 2023 04:09
URI: http://eprints.uni-mysore.ac.in/id/eprint/17480

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