Acta Crystallographica Section C

Crystal Structure Communications

Volume 63, Part 4 (April 2007)

organic compounds

av3074 scheme

Acta Cryst. (2007). C63, o263-o266 [ doi:10.1107/S0108270107010098 ]

Lamellar aggregation and hydrogen-bonding motifs in 3-(aminocarbonyl)pyridinium perchlorate and hydrogen oxalate

S. Athimoolam and S. Natarajan

Abstract: In the title compounds, C₆H₇N₂O⁺·ClO₄^-, (I), and C₆H₇N₂O⁺·C₂HO₄^-, (II), the carboxamide plane is twisted from the plane of the protonated pyridine ring. Lamellar or sheet-like structural features are observed through N-HO and O-HO hydrogen-bonded motifs of cations and anions in (I) and (II), respectively. These sheets are aggregated through C(4) and C(5) chain motifs in (I) and (II), respectively. R₁²(4) ring motifs in (I) and R₁²(5) motifs in (II) are formed via pyridine-anion bifurcated N-HO interactions. In (II), carboxamide groups form N-HO dimers around the inversion centres of the unit cell, with R₂²(8) ring motifs. A 2₁ screw-related helical or ribbon-like structure along the b axis is formed in (II) through carboxamide and pyridinium N-HO hydrogen bonds with the oxalate anions.

Formula: C₆H₇N₂O⁺·ClO₄^- and C₆H₇N₂O⁺·C₂HO₄^-


	Structure factor file (CIF format) (75.4 kbytes) [ doi:10.1107/S0108270107010098/av3074Isup2.hkl ] Contains datablock I

	Structure factor file (CIF format) (92.4 kbytes) [ doi:10.1107/S0108270107010098/av3074IIsup3.hkl ] Contains datablock II

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