Stacking Structure of Quinolinium Hydrogensquarate

Belombe, M. M.; Nenwa, J.; Emmerling, F.
April 2011
E-Journal of Chemistry;2011, Vol. 8 Issue 2, p603
Academic Journal
A new proton-transfer organic salt, quinolinium hydrogensquarate (C13H9NO4), has been synthesized and fully characterized by single crystal x-ray diffraction. The salt crystallizes in the monoclinic space group P21/n with the parameters: a = 3.8290(12) Å, b = 20.960(6) Å, c = 13.802(4) Å, β = 95.452(5)°, V = 1102.7(6) Å3, Z = 4 formula units. The structure consists of uncommon supramolecular neutral dimers which pile up parallel to [100] forming infinite sheets. These centrosymmetric dimers are held together by lateral hydrogen-bonds whereby two neighboring coplanar hydrogensquarate anions act as a bridge between two terminal quinolinium cations and C-H…O bridgings interlink next neighboring sheets. The bulk structure of this salt is consolidated by weak π-π interactions within the sheets which are neatly ordered side-by-side relative to one another.


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