Abstract
Single crystals of Tl2[NbCl6] (1) and Tl2 [NbBr6] (2) are obtained as black needles on heating TlCl, Nb, S2Cl2 (1) and Tl, Nb, and Br2 at 400°C (2). Tl2NbBr6 also forms in the reaction of TlBr, Nb, Br2, and S at 500°C. Both compounds crystallize in the K2[PtCl6] structure type to form non-distorted octahedral [NbХ6]2– anions (Nb–Cl 2.397(4) Å and Nb–Br 2.516(2) Å). The magnetic properties of Tl2[NbBr6] in a range 5-300 K indicate an antiferromagnetic interaction between Nb4+ ion spins (d1, S = 1/2). On cooling, the compound becomes a noncollinear ferromagnet with Tc = 23 K.
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Original Russian Text © 2018 M. N. Sokolov, A. V. Rogachev, A. V. Virovets, A. S. Bogomyakov.
Translated from Zhurnal Strukturnoi Khimii, Vol. 59, No. 1, pp. 131–134, January–February, 2018.
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Sokolov, M.N., Rogachev, A.V., Virovets, A.V. et al. Crystal Structure of Tl2[NbCl6] and Tl2[NbBr6]. J Struct Chem 59, 126–130 (2018). https://doi.org/10.1134/S0022476618010183
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DOI: https://doi.org/10.1134/S0022476618010183