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K 2 Sn 2 S 5  and K 2 Sn 2 Se 5  were prepared by reacting stoichiometric powdered mixtures of the binary compounds K 2 S or K 2 Se with Sn and the corresponding chalcogen at 1070 K, followed by slow cooling of the melt. The two compounds are isostructural and crystallize with the Tl 2 Sn 2 S 5  structure type, s.g. C 2/c, Z = 4 with a = 11.072(5) Å, b = 7.806(3)Å, c = 11.517(5)Å, β = 108.43(2)° for K 2 Sn 2 S 5  and a = 11.613(5)Å, b = 8.189(3) Å, c = 11,897(6) Å, β = 108.28(2)° for K 2 Sn 2 Se 5 . The crystal structures were refined to conventional R-factors of 0.032 and 0.031, respectively. Sn-atoms are in a distorted trigonal-bipyramidal chalcogen coordination. The average equatorial bond lengths are Sn -S: 2.427 Å and Sn -Se: 2.552 Å , the axial ones are Sn -S: 2.600 Å and Sn -Se: 2.774 Å.

Darstellung und Kristallstruktur von K 2 Sn 2 S 5 und K 2 Sn 2 Se 5 / Preparation and Crystal Structure of K 2 Sn 2 S 5 and K 2 Sn 2 Se 5