Molten salt flux synthesis and structure of the new layered uranyl tellurite, K4[(UO2)5(TeO3)2O5] |
| |
Authors: | Jonathan D Woodward |
| |
Institution: | Department of Chemistry and Biochemistry, E.C. Leach Nuclear Science Center, Auburn University, Auburn, AL 36849, USA |
| |
Abstract: | The reaction of UO3 and TeO3 with a KCl flux at 800 °C for 3 days yields single crystals of K4(UO2)5(TeO3)2O5]. The structure of the title compound consists of layered, two-dimensional sheets arranged in a stair-like topology separated by potassium cations. Contained within these sheets are one-dimensional uranium oxide ribbons consisting of UO7 pentagonal bipyramids and UO6 tetragonal bipyramids. The ribbons are in turn linked by corner-sharing with trigonal pyramidal TeO3 units to form sheets. The lone-pair of electrons from the TeO3 groups are oriented in opposite directions with respect to one another on each side of the sheets rendering each individual sheet nonpolar. The potassium cations form contacts with nearby tellurite units and axial uranyl oxygen atoms. Crystallographic data (193 K, MoKα, ): triclinic, space group , , , , α=99.642(1)°, β=93.591(1)°, γ=100.506(1)°, , Z=1,R(F)=4.19% for 149 parameters and 2583 reflections with I>2σ(I). |
| |
Keywords: | Layered structure Uranyl compound Uranyl tellurite Stereochemically active lone-pair of electrons |
本文献已被 ScienceDirect 等数据库收录! |
|