Acta Crystallographica Section C

Volume 65, Part 7 (July 2009)

organic compounds

sk3319 scheme

Acta Cryst. (2009). C65, o361-o364 [ doi:10.1107/S0108270109021106 ]

4-Aminopyridinium 4-aminobenzoate dihydrate and 4-aminopyridinium nicotinate

S. R. Jebas, A. Sinthiya, B. Ravindran Durai Nayagam, D. Schollmeyer and S. A. C. Raj

Abstract: In the title compounds, 4-aminopyridinium 4-aminobenzoate dihydrate, C₇H₆NO₂^-·C₅H₇N₂⁺·2H₂O, (I), and 4-aminopyridinium nicotinate, C₅H₇N₂⁺·C₆H₄NO₂^-, (II), the aromatic N atoms of the 4-aminopyridinium cations are protonated. In (I), the asymmetric unit is composed of two 4-aminopyridinium cations, two 4-aminobenzoate anions and four water molecules, and the compound crystallizes in a noncentrosymmetric space group. The two sets of independent molecules of (I) are related by a centre of symmetry which is not part of the space group. In (I), the protonated pyridinium ring H atoms are involved in bifurcated hydrogen bonding with carboxylate O atoms to form an R₁²(4) ring motif. The water molecules link the ions to form a two-dimensional network along the (10 $\overline{1}$ ) plane. In (II), an intramolecular bifurcated hydrogen bond generates an R₁²(4) ring motif and inter-ion hydrogen bonding generates an R₄²(16) ring motif. The packing of adduct (II) is consolidated via N-HO and N-HN hydrogen bonds to form a two-dimensional network along the (10 $\overline{2}$ ) plane.

Formula: C₅H₇N₂⁺·C₇H₆NO₂^-·2H₂O and C₅H₇N₂⁺·C₆H₄NO₂^-


	Structure factor file (CIF format) (125.6 kbytes) [ doi:10.1107/S0108270109021106/sk3319Isup2.hkl ] Contains datablock I

	Structure factor file (CIF format) (96.4 kbytes) [ doi:10.1107/S0108270109021106/sk3319IIsup3.hkl ] Contains datablock II

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