The crystal structure of zirconyl chloride octahydrate and zirconyl bromide octahydrate

Abstract

The compounds ZrOC12. 8I-I20 and ZrOBr~. 8tt20 are isomorphous and belong to the tetragonal space group D~x-P421c, with Z --8. For the chloride a ----17-08 and c -~ 7.689 /~, and for the bromide a ----17-65 and c -~ 7.95 /~. The zireonyl group consists of a complex in which four zirconium atoms are at the corners of a slightly distorted square and are linked along each edge of the square by two OH groups--one above and one below the plane of the square. Four water molecules are bound to each zirconium in such a manner that the arrangement of the eight oxygens about each zirconium is a distorted square antiprism. There are no zirconium-halogen bonds in the structure.

High Surface Area Solids Obtained by Reaction of Montmorillonite with Zirconyl Chloride

“…The four zirconium ions can be hydrolyzed independently and such a tetrameric cation can be represented schematically as shown in Figure 7. The overall dimensions of this complex, estimated from the structural data reported by Clearfield and Vaughan (1956), are -10 ~ for the overall square configuation and 4.5 fl~ for the thickness, and include the van der Waals radii of the oxygen atoms. A complex with these dimensions can be fitted into the interlayer space of the expanded montmorillonite with either a double layer of flat-lying complexes, or a single layer of complexes standing normal to the layer.…”

Characterization of ZrO2 Nano Particles Prepared by Glycothermal Method and their Efficiency as Adsorbent of As(III) and As(V) from Waste Water

“…Sodium ions are kept in a zirconia nano particle structure, thus stabilizing the tetragonal phase [24]. Use of NaOH as a hydrothermal solution provides pH value, which is enough to activate dilution of t-ZrO 2 nano particles, stabilized by impurity ions.…”

Sorption of Heavy-Metal Cations by Al and Zr-Hydroxy-Intercalated and Pillared Bentonite

“…In solutions of zirconyl chloride, the planar Zr-tetramer [Zr4(OH)8(H20)j 8+ is the dominant species, which can polymerize to larger units (Clearfield and Vaughan, 1956;Bartley, 1988). Based on the d(001)-values of Zr-hydroxy-intercalated montmorillonite of 19 ,~, Yamanaka and Brindley (1979) postulated that Zr-tetramers measuring 10 • 10 • 4.5 ,~ are intercalated with the plane of the molecule either perpendicular to the clay layers or as a double layer of flat lying complexes.…”