125 Te NMR provides evidence of autoassociation of organo-ditellurides in solution

The frequency of the resonance of ¹²⁵Te of two organo-ditellurides, R-Te-Te-R (R = 4-CH₃C₆H₄ and 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, …