Effect of selenium isotopes on selenium-77 nuclear shielding in diselenides

Autor:	Willy Gombler
Rok vydání:	1983
Předmět:	Diselenide Isotopes of selenium chemistry Isotope Radiochemistry Kinetic isotope effect General Engineering Analytical chemistry chemistry.chemical_element Nuclear magnetic resonance spectroscopy Conformational isomerism Selenium Isotopomers
Zdroj:	Journal of Magnetic Resonance (1969). 53:69-75
ISSN:	0022-2364
DOI:	10.1016/0022-2364(83)90071-9
Popis:	The effect of all selenium isotopes on the nuclear shielding of the neighboring 77Se nucleus in CF3SeSeCF3, CH3SeSeCH3, and CF3SeSeCH3 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 CH3Se group of CF3SeSeCH3 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.
Databáze:	OpenAIRE
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