INDIRECT DETECTION OF SE-77 IN NUCLEAR-MAGNETIC-RESONANCE SPECTRA OF ORGANOSELENIUM COMPOUNDS

Se-77 was measured by inverse proton detection using multiple-quantum H-1-{Se-77} correlation spectroscopy. One- and two-dimensional heteron uclear multiple quantum coherence (HMQC) experiments are reported for selenophene, benzeneselenol, dimethyl selenide, dimethyl diselenide, a nd D,L-selenomethionine with a range of Se-77-H-1 coupling constants f rom 9.5 to 54.2 Hz. In these compounds having protons with different S -77-H-1 coupling constants the different correlations can be selective ly enhanced by varying the mixing time. The enhancement for indirect v ersus direct Se-77 detection was estimated for dimethyl selenide yield ing a value close to the theoretical enhancement.