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.

Electrocatalytic hydrogen evolution mediated by an organotelluroxane macrocycle stabilized through secondary interactions

“…In solution, 19 F NMR (whose natural abundance of 19 F: 100%, I = 1/2) is suitable for monitoring the formation and stability of the products obtained in reactions. In previous reports cyclic phosphinates 35 and phenyl seleninate 39,40 act as bridging ions between two tetraorganoditelluroxane units, while in the present work, weak ligands like BF 4 − and ClO 4 − are present as bridging ligands.…”

“…On adding a strong protic acid (benzeneseleninic acid) to compound 2, the 125 Te and 19 In solution, 19 F NMR (whose natural abundance of 19 F: 100%, I = 1/2) is suitable for monitoring the formation and stability of the products obtained in reactions. In previous reports cyclic phosphinates 35 and phenyl seleninate 39,40 ] for 3. This matches well with the simulated HRMS patterns of 2 and 3 (Fig.…”

“…Subsequently, the anion exchange reaction of the 12-membered macrocycle with different anions shows a variable geometry around the central atom. 40 Synthesis of telluronium salts is known in the literature. 41–43 Here, we present the synthesis and structural characterization of 12-membered tellurium macrocycles where weak anions such as ClO 4 − and BF 4 − act as μ 2 -bridging and capping ligands and isolation of homoleptic telluronium salts, obtained through the milder synthetic methodology.…”