/sup 18/O-isotope-induced shifts in /sup 15/N nuclear magnetic resonance spectroscopy. 1. Isotope shift in nitrite and its application to the study of oxygen exchange of sodium (/sup 15/N, /sup 18/O/sub 2/)nitrite

Journal Article · Wed Sep 23 04:00:00 EDT 1981 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00409a002· OSTI ID:6021540

Van Etten, R L; Risley, J M

Substitution of /sup 18/O for /sup 16/O results in an upfield shift in the /sup 15/N nuclear magnetic resonance signal of the /sup 15/N-enriched nitrite and nitrate ions. The magnitude of the shift in the /sup 15/N NMR signal depends on the number of /sup 18/O atoms covalently bonded to the nitrogen atom. In nitrite the shift is 0.138 ppM//sup 18/O. This relatively large isotope shift permits the direct study by nuclear magnetic resonance spectroscopy of oxygen-exchange reactions involving nitrogen species. Acid-catalyzed medium nitrite(oxygen)-water exchange was followed in a continuous assay mode to demonstrate the ease and applicability of the isotope shift to the study of nitrogen(oxygen)-water exchange reactions. It was found that at pH 6.26 and 28/sup 0/C a sequential mode of exchange of the oxygen atoms is observed. This observation agreed with a mechanism postulated earlier on the basis of indirect evidence.

• Research Organization: Purdue Univ., West Lafayette, IN
• OSTI ID: 6021540
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 103:19; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400202* -- Isotope Effects
Isotope Exchange
& Isotope Separation
400203 -- Isotope Exchange & Isotope Separation-- (-1987)
ALKALI METAL COMPOUNDS
CHEMICAL REACTIONS
EVEN-EVEN NUCLEI
HYDROGEN COMPOUNDS
ISOTOPE EFFECTS
ISOTOPES
ISOTOPIC EXCHANGE
LIGHT NUCLEI
MEDIUM TEMPERATURE
NITROGEN 15
NITROGEN ISOTOPES
NMR SPECTRA
NUCLEI
ODD-EVEN NUCLEI
OXYGEN 18
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
PH VALUE
SODIUM COMPOUNDS
SPECTRA
STABLE ISOTOPES
WATER