Acta Crystallographica Section C

Crystal Structure Communications

Volume 60, Part 8 (August 2004)

ga1062 scheme

Acta Cryst. (2004). C60, o585-o588 [doi:10.1107/S0108270104013964]

Picolinamidium squarate and di-p-toluidinium squarate dihydrate

I. Uçar, A. Bulut, O. Z. Yesilel and O. Büyükgüngör

Abstract: The crystal structure determinations of picolinamidium squarate, C₆H₇N₂O⁺·C₄O₄^-, (I), and di-p-toluidinium squarate dihydrate, 2C₇H₁₀N⁺·C₄O₄^2-·2H₂O, (II), are reported. While salt formation occurs by donation of one H atom from squaric acid to the picolinamide molecule in (I), in compound (II), each squaric acid molecule donates one H atom to the p-toluidine N atom of two trans p-toluidine molecules. In (I), the pyridine ring is coplanar with the squarate monoanion through imposed crystallographic mirror symmetry; in (II), the dihedral angle between the p-toluidine moiety and the squarate dianion is 70.71 (1)°. In (I), a three-dimensional structure is formed via van der Waals interactions between parallel planes of molecules, with hydrogen-bond interactions (N-HO and O-HO) acting within the planes; hydrogen bonds form a three-dimensional network in (II).

Formula: C₆H₇N₂O⁺·C₄HO₄^- and 2C₇H₁₀N⁺·C₄O₄^2-·2H₂O

Online 21 July 2004


	Structure factor file (CIF format) (35.6 kbytes) Contains datablock I

	Structure factor file (CIF format) (106.4 kbytes) Contains datablock II

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