6533b861fe1ef96bd12c41d5

RESEARCH PRODUCT

Spectroscopic Investigation of the System TeCl4/[NEt4]PF6 in Solution and the Crystal Structure of [NEt4]2[Te2Cl10].

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Solutions containing TeCl 4 and [NEt 4 ][PF 6 ] in CH 2 Cl 2 were investigated by means of UV/vis and NMR spectroscopy in order to study the complex chemistry of TeCl 4 with the [PF 6 ] - anion. The results show formation of [TeCl 5 ] - and strong interactions of [PF 6 ] - with a tellurium containing species, presumably [TeCl 3 ] + . The life time of the Te I V -PF 6 complex is long enough to give different signals in the 1 9 F NMR spectrum of a solution containing excess [PF 6 ] - . Even a fivefold excess of Cl - ions over [PF 6 ] - does hardly lead to a dissociation of [TeCl 3 ...PF 6 ]. Crystals of [NEt 4 ] 2 [Te 2 Cl 1 0 ] were obtained from a 4:1 solution of [NEt 4 ]PF 6 and TeCl 4 in CH 2 Cl 2 . The compound crystallizes in the triclinic space group P1, a = 0.82626(7), b = 1.04260(8), c = 1.9915(3) nm, a = 84.641(9), β = 84.891(9), y = 75.208(6)° (T = 295 K). Slight variations in the molecular environment can have a substantial influence on the interatomic distances within the Te 2 Cl 2 bridge of the [Te 2 Cl 1 0 ] 2 - ion. This conclusion is confirmed by ab initio calculations.