Syntheses and Properties of Tetrakis(pentafluorophenyl)tellurium,Te(C6F5)4, and Related Compounds — Single Crystal Structures of Tris(pentafluorophenyl)tellurium Bromide,Te(C6F5)3Br,Tris(pentafluorophenyl)tellurium Trifluoromethanesulfonate, [Te(C6F5)3][OSO2CF3], and Bis(pentafluorophenyl)tellurium Oxide,Te(C6F5)2O

Te(C₆F₅)₄ was prepared from the reactions of TeCl₄ or Te(C₆F₅)₂Cl₂ with Grignard reagents or AgC₆F₅ in moderate to good yields. Substitution reactions with Me₃SiX (X = Cl, Br, OSO₂CF₃), with equimolar amounts of Br₂, with AgNO₃ and with H[BF₄] or BF₃·OEt₂ yielded the Te(C₆F₅)₃X derivatives (X = Cl, Br, OSO₂CF₃, NO₃, BF₄). Oxidation reactions of Cd, Hg, and Pd⁰ complexes led to Te(C₆F₅)₂ and the corresponding bis(pentafluorophenyl) derivatives M(C₆F₅)₂ (M = Cd, Hg, Pd) and with InBr to In(C₆F₅)₂Br. From very slow hydrolysis of Te(C₆F₅)₄ the oxide Te(C₆F₅)₂O was prepared. The thermal decomposition, the NMR and mass spectra of the partially new compounds are discussed. The crystal structures of Te(C₆F₅)₃Br (monoclinic, P2₁/a, Z = 4), [Te(C₆F₅)₃][OSO₂CF₃] (monoclinic, P2₁/n, Z = 16) and [Te(C₆F₅)₂O]₂ (triclinic, P1¯, Z = 2) were determined.