Abstract
<jats:p>The ability of the telluronium cation [Ar3Te]+ to bind crown ethers and acyclic polyethers through chalcogen bonding is investigated in both the solid state and in solution. Several 1:1 molecular complexes with polyoxygenated ligands of varying size and functionality were crystallized and analyzed by X-ray diffraction, revealing short Te•••O interactions (dTe-O below the sum of van der Waals radii) and high linearity (Ar-Te-O angles in the range 163-178°). NMR and DOSY (Diffusion Ordered NMR Spectroscopy) experiments confirm that these interactions persist in solution. Isothermal Titration Calorimetry provides the thermodynamic parameters for the telluronium–crown ether and telluronium–polyether equilibria, with association constants reaching Ka ~ 106 for the</jats:p>