Open-Framework Rubidium Halides Incorporated in Cadmium Oxalate Host Lattices

Abstract

The metathetic reaction between CdBr 2 and rubidium oxalate under hydrothermal conditions yields [RbBr] [Cd 6(C 2O 4) 6]·2H 2O, I, containing Cd 6O 24 clusters with the Br − ions in the center. The RbBr moiety forms a three-dimensional F m3 m structure, but with a unit cell double that of the normal stable phase. The hydrothermal reaction between rubidium oxalate and CdCl 2 in the presence of NO − 3 ions gives [Rb 2Cd(NO 3)(Cl)(C 2O 4)(H 2O)], II, containing cadmium chloro-oxalate layers. The Rb + ions present between the layers interact with the Cl atoms to form a one-dimensional RbCl chain decorated by NO − 3 groups.