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 (1JTe⋯F = 568 Hz) that can be assigned to coupling between 125Te nuclei and two fluorine atoms in BF4− ions.
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