An NMR study of the occupation of C sub 60 interstitial sites by oxygen molecules

Conference · Tue Jan 01 04:00:00 EST 1991

OSTI ID:7034684

Assink, R A; Loy, D A; Schirber, J E; Morosin, B

The 13{sub C} NMR of FCC C{sub 60} under magic angle spinning (MAS) conditions yields linewidths on the order of 1 Hz at fields of 4.7 T. The spectrum consists of a primary resonance at 143.7 ppm and a minor peak shifted 0.7 ppm downfield. The intensity of the minor resonance relative to the primary resonance was found to vary from 0.6 to 5.5 % depending on the sample history. The downfield shift obeys Curie's law and is attributed to the Fermi contact coupling interaction between paramagnetic oxygen molecules and all 60 carbon atoms of rapidly rotating adjacent C{sub 60} molecules. Exposure of the sample to 1 kbar oxygen for 1 3/4 hours resulted in a spectrum of 7 evenly spaced resonances corresponding to 0 to 6 of the adjacent octahedral interstitial sites being filled with oxygen molecules. At ambient pressure, the oxygen diffused out of the lattice on time scales ranging from hours to days.

• Research Organization: Sandia National Labs., Albuquerque, NM (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 7034684
• Report Number(s): SAND-91-2592C; CONF-920402--50; ON: DE92019436
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
665100* -- Nuclear Techniques in Condensed Matter Physics -- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BASIC INTERACTIONS
CARBON
CARBON 13
CARBON ISOTOPES
CURIE-WEISS LAW
DIFFUSION
ELEMENTS
EVEN-ODD NUCLEI
FERMI INTERACTIONS
INTERACTIONS
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
MAGNETISM
NONMETALS
NUCLEAR MAGNETIC RESONANCE
NUCLEI
OXYGEN
PARAMAGNETISM
RELAXATION TIME
RESONANCE
SOLID CLUSTERS
STABLE ISOTOPES
WEAK INTERACTIONS