title: 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 (125)Te NMR spectrum of 4 shows the appearance of a triplet ((1)JTe···F = 568 Hz) that can be assigned to coupling between (125)Te nuclei and two fluorine atoms in BF4(−) ions.
authors: School of Chemistry, University of Hyderabad, Hyderabad 500046, A.P., India. vbsc@uohyd.ernet.
authors: Nagarjuna Kumar
authors: NK
authors: Srungavruksham
authors: Viswanathan
authors: V
authors: Baskar