Hemipiperazinediium bis­(pyridine-2,6-dicarboxyl­ato-κ3 O,N,O′)gallate(III) pyridine-2,6-dicarboxylic acid dihydrate

摘要

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 GaIII 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—H⋯O, N—H⋯O and O—H⋯N hydrogen bonds and π–π inter­actions [centroid–centroid distances of 3.5359 (13) and 3.6550 (14) Å].