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Crystals 2018, 8(8), 319;

Structural Chemistry of Halide including Thallides A8Tl11X1−n (A = K, Rb, Cs; X = Cl, Br; n = 0.1–0.9)

Institute of Inorganic Chemistry, University of Regensburg, 93040 Regensburg, Germany
Central Analytics, X-ray Crystallography Dept., University of Regensburg, 93040 Regensburg, Germany
Author to whom correspondence should be addressed.
Received: 23 July 2018 / Revised: 7 August 2018 / Accepted: 7 August 2018 / Published: 10 August 2018
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A8Tl11 (A = alkali metal) compounds have been known since the investigations of Corbett et al. in 1995 and are still a matter of current discussions as the compound includes one extra electron referred to the charge of the Tl117− cluster. Attempts to substitute this additional electron by incorporation of a halide atom succeeded in the preparation of single crystals for the lightest triel homologue of the group, Cs8Ga11Cl, and powder diffraction experiments for the heavier homologues also suggested the formation of analogous compounds. However, X-Ray single crystal studies on A8Tl11X to prove this substitution and to provide a deeper insight into the influence on the thallide substructure have not yet been performed, probably due to severe absorption combined with air and moisture sensitivity for this class of compounds. Here, we present single crystal X-Ray structure analyses of the new compounds Cs8Tl11Cl0.8, Cs8Tl11Br0.9, Cs5Rb3Tl11Cl0.5, Cs5.7K2.3Tl11Cl0.6 and K4Rb4Tl11Cl0.1. It is shown that a (partial) incorporation of halide can also be indirectly determined by examination of the Tl-Tl distances, thereby the newly introduced cdd/cdav ratio allows to evaluate the degree of distortion of Tl117− clusters. View Full-Text
Keywords: thallide; intermetallics; single crystal; X-ray structure analysis thallide; intermetallics; single crystal; X-ray structure analysis

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Gärtner, S.; Tiefenthaler, S.; Korber, N.; Stempfhuber, S.; Hischa, B. Structural Chemistry of Halide including Thallides A8Tl11X1−n (A = K, Rb, Cs; X = Cl, Br; n = 0.1–0.9). Crystals 2018, 8, 319.

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