Abstract
The effect of all selenium isotopes on the nuclear shielding of the neighboring 77Se nucleus in CF 3SeSeCF 3, CH 3SeSeCH 3, and CF 3SeSeCH 3 was observed. The detection of this isotope effect helps to prove that two magnetically equivalent selenium atoms are bonded to each other in a molecule. The isotope shift per unit mass difference decreases with increasing mass of the Se isotopes. This isotope effect is sensitive toward the nature of substituents. The 77Se NMR spectrum of the CH 3Se group of CF 3SeSeCH 3 exhibits a fine splitting for each isotopomer; this is attributed to the occurrence of two different conformers of this diselenide. Two 77Se- 77Se coupling constants of 10.4 and 11.5 Hz were evaluated for the two conformers.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
