Chemical shielding tensor of /sup 13/C in a carboxyl group

Journal Article · Fri Mar 15 04:00:00 EDT 1974 · J. Chem. Phys.; (United States)

OSTI ID:6166094

Chang, J J; Griffin, R G; Pines, A

The full chemical shielding tensor was measured for /sup 13/C in a carboxyl group. The experiments were performed on a single crystal of ammonium d-tartrate employing multiple-contact and total cross-polarization versions of proton-enhanced nuclear magnetic resonance. Full tensors were determined for all the /sup 13/C nuclei in the unit cell. A proton-enhanced and decoupled /sup 13/C free induction decay and Fourier transform obtained from a small single crystal of ammonium d-tartrate are shown. The unit cell of the crystal (space group P/sub 2/) contains two molecules, and thus, in general orientations, four lines are expected from the carboxyl groups. These are the four low field lines observed in the spectrum. The high field lines are from the hydroxyl carbons for which the analysis will be presented separately. In contrast, only two lines are observed using conventional NMR in isotropic solution from the two magnetically inequivalent carbon sites (carboxyl and hydroxyl).

• Research Organization: Univ. of California, Berkeley
• OSTI ID: 6166094
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 60:6; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
AMMONIUM COMPOUNDS
AROMATICS
BENZENE
CARBON 13
CARBON ISOTOPES
CARBOXYLIC ACID ESTERS
CRYSTALS
DATA
DECAY
ESTERS
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
MECHANICS
MONOCRYSTALS
NUCLEAR MAGNETIC RESONANCE
NUCLEI
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC SOLVENTS
QUANTUM MECHANICS
RESONANCE
SOLVENTS
STABLE ISOTOPES
TARTARIC ACID ESTERS
TENSORS