Darstellung und Kristallstruktur von Rb6Sn2S7 New Chalcogenometallates with Binuclear Anions, I: Preparation and Crystal Structure of Rb6Sn2S7
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چکیده
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 Rb6Sn2S7 were obtained by reacting a stoichio metric melt of Rb2S, Sn and S at 700°C. The compound is orthorhombic, oP60, s.g. f ’2,2,2, (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 SnS4 tetrahedra sharing a common sulfur atom. The mean Sn-S bond length calculates as 2.384 Ä, 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. Neue Chalkogenometallate mit binuklearen Anionen, I:
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