Synthese und Kristallstruktur von Tris(diethylamino)benzylphosphonium- bromiden: [(C₂H₅)₂N]₃PCH₂C₆H₅ ⁺ Br^- · CH₃CN und [(C₂H₅)₂N]₃PCH₂C₆H₅ ⁺ Br₃ ^- / Synthesis and Crystal Structures of Tris(diethylamino)benzylphosphonium Bromides: [(C₂H₅)₂N]₃PCH₂C₆H₅ ⁺ Br^- · CH₃CN und [(C₂H₅)₂N]₃PCH₂C₆H₅ ⁺ Br₃ ^-

Abstract

Tris(diethylamino)benzylphosphonium bromide, [(C 2 H 5 ) 2 N] 3 PCH 2 C 6 H 5 + Br − · CH 3 CN (1), has been prepared by the reaction of tris(diethylamino)phosphine with benzylbromide in acetonitrile and its structure determined. The colorless crystals are monoclinic, space group P2 1 /n, Z = 4, a = 954.5(11), b = 2552(3), c = 1017.9(9) pm, β = 92.27(8)°. The lattic contains Br − anions and [(C 2 H 5 ) 2 N] 3 PCH 2 C 6 H 5 + cations. [(C 2 H 5 ) 2 N] 3 PCH 2 C 6 H 5 ] + Br 3 − (2) has been obtained by treating compound 1 with equimolar quantities of elemental bromine in acetonitrile solution. The yellow-red crystals of 2 are monoclinic, space group P2 1 /n, Z = 4, a = 1065.1(4), b = 1952.9(2), c = 1201.7(2) pm, β = 98.18(2)°, and comprise [(C 2 H 5 ) 2 N] 3 PCH 2 C 6 H 5 + cations and linear Br 3 − anions.