Crystal structure and Hirshfeld surface analysis of 2-(1H-indol-3-yl)ethanaminium acetate hemihydrate

Abstract

The title molecular salt, C10H13N2 +·C2H3O2 −·0.5H2O, crystallized with four 2-(1H-indol-3-yl)ethanaminium cations (A, B, C and D) and four acetate anions in the asymmetric unit, together with two water molecules of crystallization. Each cation is linked to an anion by a C—H...π interaction. The alkylaminium side chains have folded conformations, with N—C—C—C torsion angles of −58.5 (3), 59.5 (3), −64.6 (3) and −56.0 (3)° for cations A, B, C and D, respectively. In the crystal, the cations and anions are liked by N—H...O and C—H...O hydrogen bonds, forming chains propagating along the b-axis direction. The chains are linked by the water molecules via Owater—H...O and N—H...Owater hydrogen bonds, forming layers lying parallel to the bc plane. The overall intermolecular interactions were investigated using Hirshfeld surfaces analysis.