Tris(trifluoromethyl)tellurate(II), [Te(CF3)3]−, the dimeric bis(trifluoromethyl)chlorotellurate(II), [(CF3)2TeCl]22−, and bis(trifluoromethyl)iodate(I), [I(CF3)2]−: the first hypervalent alkyl [10-Te-3] and [12-Te-4] species and a novel [10-I-2] compound

The reactions of (CH3)3SiCF3/[(CH3)4N]F with Te(CF3)2 and CF3I, respectively in THF or glyme at −60 °C yield [(CH3)4N][Te(CF3)3] and [(CH3)4N][I(CF3)2]. Both salts were isolated as colorless and extremely reactive solids. The NMR spectra are discussed; the 1JF,C coupling constants of the CF3 groups of the linear CF3TeCF3 and CF3ICF3 units exhibit extremely high values. Under comparable conditions and also in CH2Cl2 at ambient temperature, salts with the anion [(CF3)2TeCl]− are formed from the reactions Te(CF3)2, [TAS][(CH3)3SiF2]/(CH3)3SiCl and [PNP]Cl, respectively. The crystal structure (triclinic; P-1) of [TAS]2[(CF3)2Te(μ-Cl)2Te(CF3)2] exhibits dimeric chloro-bridged TeCl units.