Date Published: May 01, 2010
Publisher: International Union of Crystallography
Author(s): María-Guadalupe Hernández Linares, Gabriel Guerrero Luna, Sylvain Bernès.
In the crystal structure of the title salt, C8H12N+·C2F3O2−, all of the ammonium H atoms serve as donors for hydrogen bonds to carboxylate O atoms, forming an R43(10) ring motif based on two cations and two anions. Since both cations and anions act as inter-ion bridging groups, R(10) rings aggregate in a one-dimensional supramolecular network by sharing the strongest N—H⋯O bond. Edge-sharing motifs lie on the twofold screw axis parallel to , and antiparallel packing of these 21-column structural units results in the crystal structure. This arrangement is one of the most commonly occurring in conglomerates of chiral 1-phenylethylamine with achiral monocarboxylic acids, confirming that these ionic salts are particularly robust supramolecular heterosynthons useful in crystal engineering.
For graph-set analysis, see: Etter (1990 ▶); Bernstein et al. (1995 ▶). For characteristic structural patterns found in crystal salts of 1-phenylethylamine and monocarboxylic acids, see: Kinbara, Hashimoto et al. (1996 ▶); Kinbara, Kai et al. (1996 ▶); Lemmerer et al. (2008 ▶). For related chiral salt structures, see: Johansen et al. (1998 ▶); Boussac et al. (2002 ▶); Lemmerer et al. (2008 ▶).