Acta Crystallographica Section C

Crystal Structure Communications

Volume 63, Part 9 (September 2007)

organic compounds

gg3102 scheme

Acta Cryst. (2007). C63, o530-o534 [ doi:10.1107/S0108270107035469 ]

Hydrogen-bonded frameworks of bis(2-carboxypyridinium) hexafluorosilicate and bis(2-carboxyquinolinium) hexafluorosilicate dihydrate

V. O. Gelmboldt, E. V. Ganin and K. V. Domasevitch

Abstract: In bis(2-carboxypyridinium) hexafluorosilicate, 2C₆H₆NO₂⁺·SiF₆^2-, (I), and bis(2-carboxyquinolinium) hexafluorosilicate dihydrate, 2C₁₀H₈NO₂⁺·SiF₆^2-·2H₂O, (II), the Si atoms of the anions reside on crystallographic centres of inversion. Primary inter-ion interactions in (I) occur via strong N-HF and O-HF hydrogen bonds, generating corrugated layers incorporating [SiF₆]^2- anions as four-connected net nodes and organic cations as simple links in between. In (II), a set of strong N-HF, O-HO and O-HF hydrogen bonds, involving water molecules, gives a three-dimensional heterocoordinated rutile-like framework that integrates [SiF₆]^2- anions as six-connected and water molecules as three-connected nodes. The carboxyl groups of the cation are hydrogen bonded to the water molecule [OO = 2.5533 (13) Å], while the N-H group supports direct bonding to the anion [NF = 2.7061 (12) Å].

Formula: 2C₆H₆NO₂⁺·SiF₆^2- and 2C₁₀H₈NO₂⁺·SiF₆^2-·2H₂O


	Structure factor file (CIF format) (93.3 kbytes) [ doi:10.1107/S0108270107035469/gg3102Isup2.hkl ] Contains datablock I

	Structure factor file (CIF format) (129.7 kbytes) [ doi:10.1107/S0108270107035469/gg3102IIsup3.hkl ] Contains datablock II

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