Received 29 November 2007
The reaction of antimony(III) chloride, 4,4'-bipyridine (4,4'-bipy) and pyridine-2,6-dicarboxylic acid (pydcH2), in a 1:2:2 molar ratio in an aqueous solution, resulted in the formation of the title centrosymmetric disordered mixed-valence SbIII/SbV compound, (C10H9N2)2[Sb2(C7H3NO4)2(OH)6]·8H2O or (4,4'-bipyH)2[Sb(pydc)(OH)2(-OH)]2·8H2O. The seven donor atoms of the (pydc)2- groups and the hydroxido ligands form a distorted pentagonal-bipyramidal arrangement around the SbIII/SbV centers. C-H stacking interactions between CH groups of the complex dianion and the aromatic rings of the (4,4'-bipyH)+ cations, with a distance of 2.89 Å, are observed. In the crystal structure, a wide range of noncovalent interactions, consisting of O-HO, N-HO and C-HO hydrogen bonds [DA ranging from 2.722 (2) to 3.137 (3) Å], ion pairing, - stacking [centroid-centroid distance of 3.4363 (13) Å] and C-H interactions, connect the various components into a supramolecular structure.
Data collection: SMART (Bruker, 2005); cell refinement: SAINT (Bruker, 2005); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: SU2034 ).
Financial support from Ilam University and the Teacher Training University is gratefully acknowledged.
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