Abstract
The preparation of thallium(I) dodecahydro-closo-dodecaborate Tl2[B12H12] was studied over 40 years ago by Muetterties et al. [1], its crystal structure, however, was never determined. Colourless octahedral single crystals of this title compound were obtained by neutralizing an aqueous solution of the free acid (H3O)2[B12H12] with Tl2CO3 and recrystallization of the crude product from water. The crystal structure of Tl2[B12H12] (cubic, Fm3, Z 4; a 1075.51(6) pm) is isostructural to that one of the dodecahydrocloso-dodecaborates with heavy alkali-metal cations K , Rb and Cs reported previously [2, 3]. It can be described as an anti-CaF2type arrangement in which Tl cations occupy all the tetrahedral interstices within the cubic closest-packed host lattice of the quasiicosahedral [B12H12]-cluster dianions.
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