NMR spectroscopic studies on chalcogen compounds. 4. Carbon-13 isotope effect on selenium-77 and tellurium-125 nuclear shielding and its correlation with carbon-selenium bond distances. Tellurium-123 isotope effect on tellurium-125 nuclear shielding
作者:Willy Gombler
DOI:10.1021/ja00388a023
日期:1982.12
A one-bond isotope effect of /sup 13/C on the nuclear shielding of /sup 77/Se and /sup 125/Te was observed for the first time. Thirty values for Se(II) and Se(IV) compounds containing sp/sup 3/-, sp/sup 2/-, and sp-hybridized carbon were measured, and a wide range of low frequency shifts was found between -0.012 and -1.099 ppM. A correlation was established between the isotope shift and the C-Se bond