/sup 13/C--/sup 13/C dipolar spectra in solids

Journal Article · Thu Dec 15 04:00:00 EST 1977 · J. Chem. Phys.; (United States)

OSTI ID:5336060

van Willigen, H; Griffin, R G; Haberkorn, R A

A single crystal NMR study has been made of the /sup 13/C--/sup 13/C dipolar interaction in oxalic acid dihydrate (HOX) and diammonium oxalate monohydrate (DAOX). The results show that indirect contributions to the interaction are negligibly small so that the dipolar tensor provides information on the C--C bond length and orientation in the crystal lattice. In HOX the relative orientations of the principal components of the chemical shift and dipolar tensors confirm the unusual orientation of the shift tensor components with respect to the molecular coordinate system. Because of the nonplanar structure of the oxalate ion in DAOX, the ratio between the chemical shift difference of the two /sup 13/C atoms in one molecule and the dipolar splitting can be varied by a suitable choice of crystal orientation. As a consequence, the /sup 13/C--/sup 13/C spectra exhibit A/sub 2/ and AB patterns.

• Research Organization: Francis Bitter National Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
• OSTI ID: 5336060
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 67:12; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400202* -- Isotope Effects
Isotope Exchange
& Isotope Separation
CARBON 13
CARBON ISOTOPES
CARBOXYLIC ACID SALTS
CRYSTALS
DIPOLE MOMENTS
ELECTRIC DIPOLE MOMENTS
ELECTRIC MOMENTS
EVEN-ODD NUCLEI
ISOTOPE EFFECTS
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
MONOCRYSTALS
NUCLEAR MAGNETIC RESONANCE
NUCLEI
OXALATES
RESONANCE
STABLE ISOTOPES