Acta Crystallographica Section C

Crystal Structure Communications

Volume 69, Part 8 (August 2013)


organic compounds



Acta Cryst. (2013). C69, 904-909    [ doi:10.1107/S0108270113017629 ]

N-H...O, O-H...O hydrogen-bonded supra­molecular sheet formation in the bis­(2-amino­anilinium) fumarate, 3-methyl­anilinium hydrogen fumarate and 4-chloro­anilinium hydrogen fumarate salts

D. Sathya, R. Jagan, R. Padmavathy, R. M. Kumar and K. Sivakumar

Abstract: In bis­(2-amino­anilinum) fumarate, 2C6H9N2+·C4H2O42-, (I), the asymmetric unit consists of two amino­anilinium cations and one fumarate dianion, whereas in 3-methyl­anilinium hydrogen fumarate, C7H10N+·C4H3O4-, (II), and 4-chloro­anilinium hydrogen fumarate, C6H7ClN+·C4H3O4-, (III), the asymmetric unit contains two symmetry-independent hydrogen fumate anions and anilinium cations with a slight difference in their geometric parameters; the two salts are isostructural. In (II) and (III), the carb­oxy­lic acid H atoms of the anions are disordered across both ends of the anion, with equal site occupancies of 0.50. Both the 4-chloro­anilinium cations of (III) are disordered over two orientations with major occupancies fixed at 0.60 in each case. The hydrogen fumarate anions of (II) and (III) form one-dimensional anionic chains linked through O-H...O hydrogen bonds. Salts (II) and (III) form two-dimensional supra­molecular sheets built from R44(16), R44(18), R55(25) and C22(14) motifs extending parallel to the (010) plane, whereas in (I), an (010) sheet is formed built from two R43(13) motifs, two R22(9) motifs and an R44(18) motif.

Formula: 2C6H9N2+·C4H2O42- and two analogues

Keywords: crystal structure; hydrogen bonding; fumarate salts.


hkldisplay filedownload file

Structure factor file (CIF format) (167.2 kbytes)
[ doi:10.1107/S0108270113017629/uk3068Isup2.hkl ]
Contains datablock I


hkldisplay filedownload file

Structure factor file (CIF format) (328.6 kbytes)
[ doi:10.1107/S0108270113017629/uk3068IIsup3.hkl ]
Contains datablock II


hkldisplay filedownload file

Structure factor file (CIF format) (261.2 kbytes)
[ doi:10.1107/S0108270113017629/uk3068IIIsup4.hkl ]
Contains datablock III


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