Synthesis of new T-shaped hypervalent complexes of tellurium showing Te-π-aryl interactions: X-ray characterization of [(mes)XTe(μ-X)Te(mes) (etu)] (X = Br, I) and [Ph(etu)Te(μ-I)Te(etu)Ph][PhTeI4] (mes = mesityl; Etu = ethylenethiourea)

  • Lang E
  • Manzoni De Oliveira G
  • Casagrande G
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Abstract

Dimesityl ditelluride, (mesTe)2, reacts with bromine/iodine and ethylenethiourea in methanol to give [(mes)XTe(μ-X)Te(mes)(etu)] {X = Br (1), I (2)}. The salt [Ph(etu)Te(μ-I)Te(etu)Ph][PhTeI4] (3) is obtained by reflux of a mixture of (PhTe)2, iodine, ethylenethiourea and PhTeI3in methanol. The new complexes were prepared in good yields by a one-pot procedure and characterized by single crystal X-ray diffraction. In the complexes 1 and 2, the tellurium atoms perform Te-π-aryl interactions and attain T-shaped coordinations with a bridging halogen ligand. The [PhTeI4]-anions of complex 3 are associated in a quasi-dimeric configuration and the tellurium atoms achieve an octahedral coordination through secondary Te-I bonds. © 2005 Elsevier B.V. All rights reserved.

Author-supplied keywords

  • Organotellurium halides
  • T-shaped complexes of TeII
  • Te-π-aryl interactions

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