Crystal Structure of Tl2[NbCl6] and Tl2[NbBr6] |
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| Authors: | M. N. Sokolov A. V. Rogachev A. V. Virovets A. S. Bogomyakov |
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| Affiliation: | 1.Nikolaev Institute of Inorganic Chemistry, Siberian Branch,Russian Academy of Sciences,Novosibirsk,Russia;2.International Tomography Center, Siberian Branch,Russian Academy of Sciences,Novosibirsk,Russia;3.Novosibirsk State University,Novosibirsk,Russia |
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| 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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