Research Article: (R)-1-Phenyl­ethyl­ammonium trifluoro­acetate

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 [010], 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.

Partial Text

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 ▶).




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