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Title: Supramolecular salts containing the anionic [Ge(C(2)O(4))(3)](2-) complex and heteroaromatic amines
Author: Cunha-Silva, Luís
Shi, Fa-Nian
Almeida Paz, Filipe A.
Hardie, Michaele J.
Klinowski, Jacek
Trindade, Tito
Rocha, João
Keywords: Germanium(IV) oxalate
Organic–inorganic hybrids
Hydrogen bonds
Crystalline structures
Issue Date: Jan-2009
Publisher: Elsevier
Abstract: The crystalline compounds (Hbipy)2[Ge(C2O4)3] (1) and (Hphen)2[Ge(C2O4)3] 2(H2O) (2) [Hbipy+ is the 2,20-bipyridinium cation (C10H9N2), and Hphen+ is the 1,100-phenathrolinium cation (C12H9N2)] were isolated from mild hydrothermal syntheses and their structures were elucidated from single-crystal X-ray diffraction. The two compounds were further characterised by vibrational spectroscopy (FT-IR and FT-Raman), thermogravimetric analysis (TGA) and CHN elemental composition. Compounds 1 and 2 comprise the tris(oxalato-O,O0)germanate dianion complex, [Ge(C2O4)3]2 , which co-crystallises with Hbipy+ (in 1), or Hphen+ and water molecules (in 2). In 1, the germanium oxalate anionic complex, [Ge(C2O4)3]2 , and the Hbipy+ organic residues interact mutually via N–H O hydrogen bonding interactions, leading to supramolecular discrete hydrogen-bonded units which are further interconnected via p–p stacking. Compound 2, on the other hand, exhibits a more complex hydrogen bonding network due to the presence of the water molecules of crystallisation which, along with p–p stacking between neighbouring Hphen+ residues, mediate the crystal packing.
Peer review: yes
DOI: 10.1016/j.ica.2008.02.038
ISSN: 0020-1693
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