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Transparent yellow single crystals of Na 4 SnSe 4  and K 4 SnSe 4  were prepared by reacting stoichiometric powdered mixtures of the binary compounds Na 2 Se or K 2 Se, Sn and Se at 850 K. Na 4 SnSe 4  is tetragonal, s.g. P4̄2 1 c, with a = 8.165(2) Å, c = 7.268(2) Å, Z = 2. K 4 SnSe 4  is orthorhombic, s.g. Pnma, with a = 14.714(7) Å, b = 10.323(3) Å, c = 8.248(6) Å, Z = 4. The crystal structures were refined to conventional residuals of 0.058 and 0.031, respectively. Both com pounds are characterized as salts with discrete tetrahedral selenostannate anions. Na 4 SnSe 4  is isostructural with Na 4 SnS 4 , K 4 SnSe 4  is of a new type. The observed Sn -Se bond lengths range from 2.494 Å to 2.536 Å.

zeitschrift für naturforschung b

Na 4 SnSe 4  und K 4 SnSe 4 , zwei neue Selenostannate mit isolierten Anionen / Na 4 SnSe 4  and K 4 SnSe 4 , Two New Selenostannates with Discrete Anions