Acta Cryst. (2008). E64, m1298-m1299  [ doi:10.1107/S1600536808029140 ]

Hemipiperazinediium bis(pyridine-2,6-dicarboxylato-³O,N,O')gallate(III) pyridine-2,6-dicarboxylic acid dihydrate

M. Rafizadeh, A. Nemati and Z. Derikvand

Abstract: The asymmetric unit of the title compound, (C₄H₁₂N₂)_0.5[Ga(pydc)₂]·pydcH₂·2H₂O, where pydcH₂ is pyridine-2,6-dicarboxylic acid, C₇H₅NO₄, contains one half of a centrosymmetric piperazinediium dication, one anion, one uncoordinated pydcH₂ molecule and two uncoordinated water molecules, one of which is disordered over two sites in a 1:1 ratio. In the anion, the Ga^III ion is coordinated by four O atoms [Ga-O = 1.9706 (16)-2.0494 (15) Å] and two N atoms [Ga-N = 1.9660 (18) and 1.9709 (17) Å] from two pydc ligands in a distorted octahedral geometry. The crystal structure exhibits intermolecular O-HO, N-HO and O-HN hydrogen bonds and - interactions [centroid-centroid distances of 3.5359 (13) and 3.6550 (14) Å].

Online 20 September 2008

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