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Tetrabromo- and -iodothallates(III) of the alkali cations crystallise from aqueous solutions as cubic hydrates MTlX 4 ·nH 2 O (M = Li, Na, K, Rb, Cs, NH 4 ; X = Br, I; n = 1-2). The tetraiodothallates retain their cubic structure on dehydratisation, while the tetrabromothallates undergo structural changes. The X-ray structure analyses of RbTlBr 4  · H 2 O, NH 4 TlBr 4  · 2H 2 O and KTlBr 4  · 2H 2 O (-50 °C) showed that these compounds consist of a three-dimensional framework of TlBr 4  tetrahedra and MBr 12  ikosahedra which reminds of zeolites. In cavities of this framework 2/3 of the alkali cations and the crystal water molecules are accommodated in a disordered manner.

zeitschrift für naturforschung b

Fehlordnung von Kationen und Kristallwasser bei kubischen Alkalitetrabromo- und -iodothallaten(III)/Disorder of Cations and Water Molecules in Cubic Tetrabromo- and -iodothallates