Negative linear deuterium isotope shift for /sup 13/C in iodoform

Journal Article · Sun May 01 04:00:00 EDT 1988 · J. Struct. Chem. (Engl. Transl.); (United States)

OSTI ID:5875053

Sergeev, N M; Sergeeva, N D; Kobets, L F

It is well known that substitution of deuterium for hydrogen (H/D substitution) leads to an upfield shift for the /sup 13/C nucleus directly bonded to the hydrogen of i.e., to positive /sup 1//triangle//sup 13/C(H/D) shifts, defined as the difference between the shielding constants (/sigma//sup 13/C(D) - /sigma//sup 13/C(H)). In order to further study the effect of substituents on the value of /sup 1//triangle//sup 13/C(H/D), we have measured the /sup 13/C isotopic shift in iodoform, where we might expect a substantial reduction in the value of /sup 1//triangle//sup 13/C(H/D). The value obtained for the isotopic shift in iodoform, compared with the isotopic shift in methane, leads to the conclusion that each substitution of iodine for hydrogen is accompanied by a decrease in the isotope shift by about 0.18 ppm.

• Research Organization: M. V. Lomonosov State Univ. (USSR)
• OSTI ID: 5875053
• Journal Information: J. Struct. Chem. (Engl. Transl.); (United States), Journal Name: J. Struct. Chem. (Engl. Transl.); (United States) Vol. 28:6; ISSN JSTCA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400202 -- Isotope Effects
Isotope Exchange
& Isotope Separation
640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
CARBON 13
CARBON ISOTOPES
CHEMICAL REACTIONS
COUPLING
COUPLING CONSTANTS
DEUTERATION
DEUTERIUM
DEUTERIUM COMPOUNDS
ELEMENTS
EVEN-ODD NUCLEI
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
HYDROGEN TRANSFER
INTERMEDIATE COUPLING
IODINATED ALIPHATIC HYDROCARBONS
IODOFORM
ISOTOPE EFFECTS
ISOTOPES
ISOTOPIC EXCHANGE
J-J COUPLING
LIGHT NUCLEI
NMR SPECTRA
NONMETALS
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC IODINE COMPOUNDS
SPECTRA
SPECTRAL SHIFT
STABLE ISOTOPES