Solvothermal synthesis and structure of a new selenium-rich selenophosphate K(3)PSe(4).2Se(6) |
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Authors: | Dickerson Christine A Fisher Mary J Sykora Richard E Albrecht-Schmitt Thomas E Cody Jason A |
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Institution: | Department of Chemistry, Lake Forest College, Lake Forest, Illinois 60045, USA. |
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Abstract: | The compound K(3)PSe(4).2Se(6) was synthesized at 110 degrees C via solventothermal techniques from binary starting materials and Se in acetonitrile. The compound crystallizes in the space group Fd macro 3 of the cubic system with eight formula units in a cell with a dimension of a = 16.415(2) A at T = 193 K. The structure contains an unusual intermixing of ionic and uncharged species. The selenophosphate tetrahedral trianions PSe(4)(3-) are surrounded by potassium cations; other potassium cations in the structure are coordinated to 12 selenium atoms from four Se(6) rings in a tetrahedral arrangement. There are no short contacts between adjacent selenium rings. Heating the same reaction mixture to 160 degrees C results in the formation of only needles of trigonal selenium. |
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