Solid state n NMR

Fig. 7 Solid state N-NMR spectra of GS-3/3 at 1 40 in oriented DMPC bilayers. The arrow indicates the new resonance emerging at high peptide concentration, from which the upright alignment of gramicidin S in the membrane was calculated. The dashed line corresponds to the respective powder pattern of the lyophilized peptide...

The first natural-abundance N NMR spectrum on humic material was obtained by the solid-state CPMAS technique on a peat having a nitrogen content of 4% by Preston et al.(53). After systematic determination of important N NMR spectral parameters, it was possible to obtain solid-state N NMR spectra of humic material in soil and sediments at natural N levels(60-62) with an acceptable signal-to-noise ratio. Recently solid-state N NMR spectroscopy was extended to the investigation of the nitrogen functionality in coals.(63)... 

The covalent binding of N-labelled aniline, in the presence and absence of catalysis by horseradish peroxidase and bimessite, to the fulvic and humic acids isolated from the IHSS Elliot silt loam soil, has been examined by a combination of liquid and solid state N NMR. 

Soil contaminated with 2,4,6-trinitrotoluene (TNT) and spiked with and [ N3]-TNT has been subjected to an anaerobic-aerobic soil slurry treatment and subsequently analyzed by radiocounting and solid-state N NMR. "... 

Humic isolates from different layers of an organic matter rich algal sapropel from Mangrove Lake, Bermuda, have been analyzed using solid-state N NMR in order to reveal chemical structural interrelationships that allow delineation of diagenetic pathways. ... 

Fig. 8.5. Solid-state N NMR spectra obtained from the oriented [ N]Gly silk fibroin fiber sample. Spectra were observed with the fiber axis both (A) parallel and (B) perpendicular to the magnetic field. The best-fit simulated line shapes are superimposed on the experimental spectra. Parameters for spectral simulation were found from error analysis as a function of ap and Pf(C).

Fig. 12.15. (a) Solid-state N NMR spectral simulation of PMIA and (b) P4M-MPTA oriented samples set parallel to Bo. The solid and broken lines represent observed and simulated spectra, respectively. The simulated peaks are composed of three components A, B and C. 

FIGURE 8.17 Solid-state N NMR spectrum of freeze-dried N-labeled algae. Spinning sidebands (SSB) are indicated by asterisks (Zang et al., 2000). 

Solid state N NMR has also been used " to study lyophilized powders of N-enriched histidine and imidazole, prepared from aqueous solutions with pH ranging... 

Dynamic solid-state N NMR studies have been performed to study proton transfer in, e.g., porphine derivatives. Line-shape analysis has provided rates of proton exchange that differ greatly from case to case and that are often very different when comparing solution and solid-state data. 

Y. Ishii, R. Tycko, Sensitivity enhancement in solid state N NMR by indirect detection with high-speed magic angle spinning,). Magn. Reson. 142 (2000) 199-204. 

Figure 16.9. Solid-state N NMR spectra of undoped (lower spectrum) and iodine-doped (upper sectrum) methyl substituted polyazine. The asterisks denote spinning side-bands. The reference is NH4CI. The spectra are normalized to the intensity maximum and offset on the intensity scale for clarity.

Knicker, H., Hatcher, P.G., and Scaroni, A.W. A solid-state N NMR spectroscopic investigation of the origin of nitrogen structures in coal. 

Smemik, R.J., and Baldock, J.A. Does solid-state N NMR spectroscopy detect all... 

Structure of Solids - A H- H dipolar coupling NMR study of the water molecule in magnetically H dilute crystalline hydrates has been reported. High resolution F MAS and F- Cd REDOR NMR spectroscopy has been used to study oxygen/fluorine ordering in oxyfluorides. Solid-state N NMR spectroscopy has been used to investigate nitrosoarene-metal interactions in model systems and in haem proteins. Phase-alternated composite pulses have... 

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