The crystal structure of ammonium di-μ-hydroxo-di[triscarbonato-zirconate(IV)]tetrahydrate
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The crystal structure of ammonium di-μ-hydroxo-di[triscarbonatozirconate(IV)]tetrahydrate, (NH4)6[Zr(OH)(CO3)3]2. 4H2O, has been determined. The crystals are monoclinic, P21/n, with cell dimensions a = 16.46 ± 0.02 Å, b = 11.53 ± 0.03 Å, c = 6.95 ± 0.01 Å and β = 92.0 ± 0.2 Å. The observed density, 1.87 ± 0.05 g/cm3, corresponding to four molecules per unit cell. The crystals consist of discrete dimeric species in which the metal atoms are bridged by hydroxo groups. Each carbonate ion behaves as a bidentate ligand forming with the hydroxo groups a distorted dodecahedron of oxygen atoms about each zirconium atom. The dimers are held in the crystal through the compensating electrostatic charge of the ammonium ions and a network of hydrogen bonds to the water molecules. © 1970.
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