N-H…O, C-H… O hydrogen-bonded supramolecular frameworks in 4-fluoroanilinium and dicyclohexylaminium picrate salts

Abstract

The asymmetric unit of compound ( I ), 4-fluoroanilinium picrate, C 6 H 7 NF + .C 6 H 2 N 3 O 7 − contain one 4-fluoroanilinium cation and one picrate anion whereas in compound ( II ), dicyclohexylaminium picrate, C 12 H 22 N + .C 6 H 2 N 3 O 7 − the asymmetric unit contains two sets of dicyclohexylaminium cation and picrate anion due to conformational difference between the molecules. In ( I ), all three nitro groups of the picrate anion are positionally disordered over two sites refined to major and minor components. The molecular ions of ( I ), interlinked through N–H‧‧‧O and C–H‧‧‧O hydrogen bonds forming two-dimensional supramolecular sheet along (-1 0 1) plane. Whereas in ( II ), the symmetry-independent molecules labeled as A and B molecule form independent one-dimensional supramolecular tape extending along (1 1 0) and (1 0 0) direction. The supramolecular tapes are interlinked through C–H‧‧‧O interaction to form three-dimensional network in the crystalline solid in ( II ).