Te4Se2O6 macrocycle stabilizing triangular planar and tetrahedral anions

Abstract

The anion exchange reactions of Cl-macrocycle 1a [(p-MeO-C₆H₄)₂Te)₂(μ-O)(μ-PhSeO₂)(μ₄-Cl)]₂ with AgNO₃, AgClO₄ and AgBF₄ yielded colourless solids whose single crystal X-ray diffraction studies revealed the formation of 12-membered macrocycles [(p-MeO-C₆H₄)₂Te)₂(μ-O)(μ-PhSeO₂)(μ-X)]₂ [X = NO₃ (2), ClO₄(3), BF₄(4)]. ESI-MS studies revealed that macrocycles 2–4 retain their integrity in solution. The solution ¹²⁵Te NMR spectrum of 4 shows the appearance of a triplet (¹J_Te⋯F = 568 Hz) that can be assigned to coupling between ¹²⁵Te nuclei and two fluorine atoms in BF₄⁻ ions.