Abstract
The crystal structure of [(H5O2)(pydaH)2][Gd(pydc)3]·2(H2O), (pyda·H = 2,6-diaminopyridinum), (pydc = 2,6-pyridinedicarboxylate), has been determined by the X-ray diffraction method. This ionic complex crystallizes in the monoclinic system, space group P2/n, with two molecules per unit cell. The unit cell dimensions are a = 9.641(4), b = 10.653(5), c = 17.696(9)A, β = 95.649(13)°, V = 1808.5(14)A3. The final R value is 0.0493 for 3177 measured reflections. The organic salt of a complex anion is formed between gadolinium(III) and three deprotonated [pydc·H2]ligand moieties. The gadolinium atom is at the center of a distorted tricaped trigonal prismatic donor-atom geometry. The geometry of the ligands and that of the primary coordination sphere is very similar to that of the analogous anionic tris(ligand)-rare earth complexes of the [pydc]2- dianion.
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