title: 125Te NMR provides evidence of autoassociation of organo-ditellurides in solution.
abstract: The frequency of the resonance of125Te of two organo-ditellurides, R-Te-Te-R (R = 4-CH3C6H4and 2-(CH3)2NCH2C6H4), in solution undergoes a low-field shift as the concentration of the sample increases. In sharp contrast, the resonance of a sterically hindered ditelluride (R = (C6H5(CH3)2Si)3C) and telluric acid display the opposite effect. While the negative concentration coefficients can be explained by the change in magnetic susceptibility, the positive coefficients are consistent with autoassociation of the molecules through tellurium-centred supramolecular interactions. Although the corresponding equilibrium constants are small, the process is shown to be exothermic. However, the influence of autoassociation is much smaller than the effects of solvent polarity and the conformation of the ditelluride bond.
authors: Department of Chemistry and Chemical Biology, McMaster University, 1280 Main St. West, Hamilton, Ontario L8S 4M1, Canada. vargas@chemistry.mcmaster.ca.
authors: P J W
authors: PJ
authors: Elder
authors: Department of Chemistry and Chemical Biology, McMaster University, 1280 Main St. West, Hamilton, Ontario L8S 4M1, Canada. vargas@chemistry.mcmaster.ca.
authors: I
authors: http://orcid.org/0000-0002-3074-2051
authors: I
authors: Vargas-Baca