摘要:
                                Complexes of 2-methyl(phenyl)benzo-1,3-tellurazole and 2-methyl(phenyl)benzo-1,3-selenazole with tungsten pentacarbonyl and boron trifluoride were studied by heteronuclear NMR spectroscopy (H-1, C-13, Se-77, and Te-125). The coordination mode of the ambident ligand can be determined from the coordination shifts of the Te-125 and Se-77 NMR signals: upfield at coordination via Te and Se atoms and downfield at N coordination.