Direct Syntheses of Bis(tetraphenylphosphonium) and Bis(ethyltriphenylphosphonium) Hexabromo‐diselenates(II), [PPh4]2[Se2Br6] and [PEtPh3]2[Se2Br6]. The Crystal Structure of [PEtPh3]2[Se2Br6] |
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| Authors: | Vitalijus Janickis Prof Dr Max Herberhold Wolfgang Milius |
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| Institution: | 1. Faculty of Chemical Technology, Kaunas University of Technology, Radvilenu str. 19, LT‐50254 Kaunas, Lithuania, FAX: +370 37 300152. PHONE: +370 37 451464;2. Bayreuth/Germany, Laboratory of Inorganic Chemistry, University of Bayreuth |
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| Abstract: | Brown crystals of PPh4]2Se2Br6] ( 1 ) and PEtPh3]2Se2Br6] ( 2 ) were obtained when selenium and bromine reacted in acetonitrile solution in the presence of tetraphenylphosphonium bromide and ethyltriphenylphosphonium bromide, respectively. The crystal structure of 2 has been determined by X‐ray methods and refined to R = 0.0420 for 4161 reflections. The crystals are monoclinic, space group P21/n with Z = 2 and a = 13.055(3) Å, b = 12.628(3) Å, c = 13.530(3) Å, β = 92.40(3)° (293(2) K). In the solid state structure of 2 the dinuclear hexabromo‐diselenate(II) anion is centrosymmetric and consists of two distorted almost square‐planar SeBr4 units sharing a common edge through two bridging Br atoms. The terminal SeII–Br bond distances are found to be 2.419(1) and 2.445(1) Å, the bridging μBr–SeII bond distances 2.901(1) and 2.802(1) Å. |
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| Keywords: | Selenium Hexabromodiselenate(II) Crystal structure Tetraphenylphosphonium and Ethyltriphenylphosphonium ions |
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