Two-dimensional chemical exchange NMR in the solid: proton dynamics in phthalocyanine

Journal Article · Wed Sep 17 04:00:00 EDT 1986 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00279a084· OSTI ID:5343015

Meier, B H; Storm, C B; Earl, W L

Carbon-13 solid-state cross-polarization magic angle spinning (CP-MAS) has proved to be a powerful method for investigating dynamical processes in solids. In investigations of molecules with several resonances, the intrinsically lower resolution of CP-MAS NMR spectra compared to liquid-state spectra makes the interpretation of the spectra cumbersome due to peak overlap. In some cases, such as porphyrins or phthalocyanines, these problems arising in the /sup 13/C spectra have been overcome by observing /sup 15/N instead of /sup 13/C. This requires considerable synthetic effort because the NMR measurements must be performed on an enriched sample to overcome the low sensitivity. They present here results which show that /sup 13/C 2-D exchange exchange spectroscopy can extend the resolution, allowing the spectroscopist to extract the details of the exchange process from a natural abundance sample even when the /sup 13/C resonances strongly overlap in the one-dimensional spectrum. There is another example in which 2-D exchange spectroscopy has been exploited in a solid to determine a proton exchange rate but it was in a system where resolution was not a problem. The use of 2-D spectroscopy to extend resolution should be applicable to a large class of solid compounds.

• Research Organization: Los Alamos National Lab., NM
• OSTI ID: 5343015
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 108:19; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
CARBON 13
CARBON ISOTOPES
CRYSTALS
DATA
DYES
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
HYDROGEN TRANSFER
INFORMATION
ISOTOPE ENRICHED MATERIALS
ISOTOPES
LIGHT NUCLEI
LOW TEMPERATURE
MAGNETIC RESONANCE
MATERIALS
MEDIUM TEMPERATURE
NMR SPECTRA
NUCLEAR MAGNETIC RESONANCE
NUCLEI
NUMERICAL DATA
ORGANIC COMPOUNDS
PHTHALOCYANINES
RESONANCE
SPECTRA
STABLE ISOTOPES