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Colorless crystals of the new thiostannate Rb 6 Sn 2 S 7  were obtained by reacting a stoichiometric melt of Rb 2 S, Sn and S at 700°C. The compound is orthorhombic, oP60, s.g. P2 1 2 1 2 1  (No. 19) with a = 9.982(4), b = 13.45(1), c = 15.20(1) Å; 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, [Sn 2 S 7 ] 2 - , which are built up by slightly distorted SnS 4  tetrahedra sharing a common sulfur atom. The mean Sn-S bond length calculates as 2.384 Å, 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.

zeitschrift für naturforschung b

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