Acta Cryst. (2012). C68, m246-m250 [ doi:10.1107/S0108270112031885 ]
Abstract: In order to explore the potential propensity of the 1,1'-methylenedipyridinium dication to form organic-inorganic hybrid ionic compounds by reaction with the appropriate halide metal salt, the organic-inorganic hybrid salts 1,1'-methylenedipyridinium tetrachloridocuprate(II), (C11H12N2)[CuCl4], (I), and 1,1'-methylenedipyridinium bis[tetrachloridoaurate(III)], (C11H12N2)[AuCl4]2, (II), were obtained by treatment of 1,1'-methylenedipyridinium dichloride with CuCl2 and Na[AuCl4], respectively. Both hybrid salts were isolated as pure compounds, fully characterized by multinuclear NMR spectroscopy and their molecular structures confirmed by powder X-ray diffraction studies. The crystal structures consist of discrete 1,1'-methylenedipyridinium dications and [CuCl4]2- and [AuCl4]- anions for (I) and (II), respectively. As expected, the dications form a butterfly shape; the CuII centre of [CuCl4]2- has a distorted tetrahedral configuration and the AuIII centre of [AuCl4]- shows a square-planar coordination. The ionic species of (I) and the dication of (II) each have twofold axial symmetry, while the two [AuCl4]- anions are located on a mirror-plane site. Both crystal structures are stabilized by intermolecular C-HCl hydrogen bonds and also by Cl interactions. It is noteworthy that, while the average intermolecular centroid-centroid pyridinium ring distance in (I) is 3.643 (8) Å, giving strong evidence for noncovalent - ring interactions, for (II), the shortest centroid-centroid distance between pyridinium rings of 5.502 (9) Å is too long for any significant - ring interactions, which might be due to the bulk of the two [AuCl4]- anions.
Formula: (C11H12N2)[CuCl4] and (C11H12N2)[AuCl4]2
Rietveld powder data file (CIF format) (237.7 kbytes)
Rietveld powder data file (CIF format) (251.7 kbytes)
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