Metal-metal multiply-bonded complexes of technetium. 7 1. Oxidative decomposition of tetrachlorotetrakis(dimethylphenylphosphino) ditechnetium(II) by an aminium hexachloroantimonate(V)

Abstract

TeCl 4(PMe 2Ph) 2·2SbCl 3 was isolated in low yield from the reaction of Te 2Cl 4(PMe 2Ph) 2 with 2 equiv. of [( p-BrC 6H 4) 3N][SbCl 6] in acetonitrite. Single crystals were obtained by slow evaporation of a toloune solution. The structure, determined by X-ray crystallography, is composed of infinite one-dimensional chains of an alternating sequence of TeCl 4(PMe 2Ph) 2 and (SbCl 3) 2 molecules. The individual molecular species are loosely associated through Lewis acid-base interactions between the equatorial chlorine atoms of TeCl 4(PMe 2Ph) 2 and the individual SbCl 3 units. The chains are contained by an additional weak Lewis acid-base interaction between neighboring SbCl 4 molecules. The distorted pentagonal bipyramidal coordination geometry about the antimony atom is completed by a weak π-interaction with the phenyl ring of TeCl 4(PMe 2Ph) 2. Crystal data for TeCl 4(PMe 2Ph) 2·2SbCl 4 ( 1) at 23°C: M=972.28, triclinic, Pl (No. 2), α=10.591(3), b=10.619(2), c=7.578(1) A ̊ , α=104.54(2), β=99.69(2), γ=69.92(2)°, V=771.7(3) A ̊ , Z=1 .