Crystal structure of the new A2SnTa6X18 (A = K, Rb, Cs; X = Cl, Br) cluster compounds

Abstract : The crystal structure of the new cluster compounds A2SnTa6X18 (with A = K, Rb, Cs, and X = Cl, Br) was determined by using single-crystal and powder X-ray diffraction, and 119Sn Mössbauer spectroscopy. Those compounds crystallize in the Cs2EuNb6Br18-type structure of space group R3̅. This type of structure is built up on discrete edge-bridged [M6Xi 12Xa 6]4- cluster units arranged according to a pseudo face-centered cubic stacking, where the octahedral and tetrahedral vacancies are fully occupied by divalent tin cations and monovalent alkaline cations, respectively. The tin cations influence on the halogen matrix and the electronic effects on the cluster units in the Cs2EuNb6Br18-type structure are discussed by comparison with isotype compounds. From those analyses, the ionic radius of Sn2+ in coordination number VI is estimated to be 1.14(1) Å. Finally, K2SnTa6Br18 might be considered as a new example of compound containing a quite bare stannous ion (5 s2 configuration). © 2017 Elsevier Inc.
Type de document :
Article dans une revue
Journal of Solid State Chemistry, 2018, 257, pp.72-79. 〈10.1016/j.jssc.2017.09.027〉
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01639700
Contributeur : Laurent Jonchère <>
Soumis le : lundi 20 novembre 2017 - 15:14:01
Dernière modification le : vendredi 25 mai 2018 - 01:26:20

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P. Lemoine, M. Wilmet, B. Malaman, S. Paofai, N. Dumait, et al.. Crystal structure of the new A2SnTa6X18 (A = K, Rb, Cs; X = Cl, Br) cluster compounds. Journal of Solid State Chemistry, 2018, 257, pp.72-79. 〈10.1016/j.jssc.2017.09.027〉. 〈hal-01639700〉

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