Acta Cryst. (2002). E58, m200-m202 [ doi:10.1107/S1600536802006402 ]
Abstract: The title compound, [Zn(C12H8N2)3][Cr2O7]·4H2O, was obtained by mixing 1,10-phenanthroline (phen), potassium chromate and zinc sulfate solutions. The asymmetric unit is composed of a [Zn(phen)3]2+ cation, a Cr2O72- anion and four water molecules. The ZnII ion is in a distorted octahedral environment, coordinated by six N atoms from three phen molecules. The cations are connected to anions by weak C-HO hydrogen bonds, with shortest HO distances of ca 2.27-2.33 Å. The Cr2O72- anion is in a staggered conformation. Two of the four crystallographically independent water molecules are ordered, and two others are disordered, each over two sites.
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