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]
Vitalijus JanickisMax HerberholdWolfgang Milius
Abstract
Abstract Brown crystals of [PPh 4 ] 2 [Se 2 Br 6 ] ( 1 ) and [PEtPh 3 ] 2 [Se 2 Br 6 ] ( 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 P2 1 / 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 SeBr 4 units sharing a common edge through two bridging Br atoms. The terminal Se II –Br bond distances are found to be 2.419(1) and 2.445(1) Å, the bridging μ Br–Se II bond distances 2.901(1) and 2.802(1) Å.
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