摘要:
The synthetic methods available for diorgano tritellurides, which normally give only poor to moderate yields of product, are evaluated. Most reliable when organic groups such as 2-(2'-pyridyl)phenyl- are involved is the reaction of Te2- with the organotellurenyl halide in DMF. Other methods require a final oxidative step. Reactions of Te-2(2-) with organotellurenyl halides in DMF give deep red solutions which quantitatively deposit tellurium on exposure to air; successful syntheses of (RTe)2Se2 (R = 2-(2'-pyridyl or 2'-quinolinyl)phenyl-) were carried out by use of Se-2(2-) in DMF solution. The air stable bis-[2-(p-tolyliminomethyl)phenyl] tritelluride is reported, and its Te-125 and Raman spectral data presented. The role of intra-molecular coordination in stabilising these molecules may be a secondary one; the steric effect of a bulky 2-substituent on the tellurated phenyl-ring may be more significant.