Ultrahigh resolution in proton NMR spectra at 500 MHz: two-bond intrinsic chlorine and silicon isotope effects

Journal Article · Wed Sep 16 04:00:00 EDT 1987 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00253a060· OSTI ID:5889936

Anet, F A.L.; Kopelevich, M

Heavy-atom isotope effects on NMR /sup 1/H chemical shifts have been reported in a few cases but only for second-row elements. The authors now show that /sup 37/Cl//sup 35/Cl isotope effects on the /sup 1/H chemical shifts in chlorinated methanes are about +0.2 ppb (ca. 0.1 Hz at 500 MHz) and that the /sup 29/Si//sup 28/Si isotope effect on the /sup 1/H chemical shift in tetramethylsilane (TMS) is +0.06 +/- 0.01 ppb. It is likely that previously unreported splittings arising from heavy-atom isotope effects will be observable in the /sup 1/H NMR spectra of other organic compounds, given the excellent resolution of modern high field NMR spectrometers.

• Research Organization: Univ. of California, Los Angeles
• OSTI ID: 5889936
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 109:19; 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
CHEMICAL SHIFT
CHLORINATED ALIPHATIC HYDROCARBONS
CHLORINE 35
CHLORINE 37
CHLORINE ISOTOPES
DATA
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
HALOGENATED ALIPHATIC HYDROCARBONS
HYDRIDES
HYDROGEN 1
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
INFORMATION
ISOTOPE EFFECTS
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
NMR SPECTRA
NUCLEAR MAGNETIC RESONANCE
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC SILICON COMPOUNDS
RESOLUTION
RESONANCE
SILANES
SILICON 28
SILICON 29
SILICON COMPOUNDS
SILICON ISOTOPES
SPECTRA
STABLE ISOTOPES