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Neue Chalkogenometallate mit binuklearen Anionen, I:

Darstellung und Kristallstruktur von Rb

6

Sn

2

S

7

New Chalcogenometallates with Binuclear Anions, I:

Preparation and Crystal Structure of Rb

6

Sn

2

S

7

Kurt O. Klepp und Ferdinand Fabian

Institut f¨ur Allgemeine und Anorganische Chemie, Universit¨at Linz, Altenbergerstr. 69, A-4040 Linz

* Sonderdruckanforderungen an Prof. Kurt O. Klepp. E-mail: kurt.klepp@jk.uni-linz.ac.at Z. Naturforsch.54 b,1505–1509 (1999); eingegangen am 13. September 1999

Crystal Structure, Chalcogenides, Thiostannates, Rubidium, Tin, Sulfur

Colorless crystals of the new thiostannate Rb6Sn2S7were obtained by reacting a stoichio- metric melt of Rb2S, Sn and S at 700C. The compound is orthorhombic, oP60, s.g. P212121 (No.19) with a = 9.982(4), b = 13.45(1), c = 15.20(1) ˚A; Z = 4. The crystal structure was determined from diffractometer data and refined to a conventional R of 0.043 (1380 Fo's, 137 variables). The crystal structure contains dimeric anions, [Sn2S7]2 , which are built up by slightly distorted SnS4tetrahedra sharing a common sulfur atom. The mean Sn-S bond length calculates as 2.384 ˚A, the bond angle on the bridging S is 110.4. The structure contains six independent Rb-cations which are coordinated to 5-6 sulfur atoms in irregular configurations.

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