Crystal structure of the co-crystal salt 2-amino-6-bromopyridinium 2,3,5,6-tetrafluorobenzoate

Eric Bosch, Missouri State University

Abstract

The asymmetric unit of the co-crystal salt 2-amino-6-bromopyridinium 2,3,5,6-tetrafluorobenzoate, C 5 H 6 BrN 2 + ·C 7 HF 4 O 2 -, contains one pyridinium cation and one benzoate anion. In the crystal, the aminopyridinium cationic unit forms two hydrogen bonds to the benzoate oxygen atoms in an R 2 2 (8) motif. Two pyridinium benzoate units are hydrogen bonded through self-complementary hydrogen bonds between the second amine hydrogen and a carboxylate O with a second R 2 2 (8) motif to form a discrete hydrogen-bonded complex containing two 2-amino-6-bromopyridinium moieties and two 2,3,5,6-tetrafluorobenzoate moieties. The 2-amino-6-bromopyridinium moieties π-stack in a head-to-tail mode with a centroid-centroid separation of 3.7227 (12) Å and adjacent tetrafluorobenzoates also π-stack in a head-to-tail mode with a centroid-centroid separation of 3.6537 (13) Å.