Modeling solid-state effects on NMR chemical shifts using electrostatic models
โ Scribed by Nicolas Di Fiori; Anita M. Orendt; M. C. Caputo; M. B. Ferraro; J. C. Facelli
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- English
- Weight
- 156 KB
- Volume
- 42
- Category
- Article
- ISSN
- 0749-1581
- DOI
- 10.1002/mrc.1432
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โฆ Synopsis
This paper presents a comparison of the embedded ion method (EIM) and the surface charge representation of the electrostatic embedding potential (SCREEP) method, two methods which can be used to calculate solid-state effects on NMR chemical shifts. The results in a selected group of compounds with known single-crystal solid-state NMR data and neutron diffraction structures, confirm that these effects are important in both (13)C and (15)N chemical shifts. The solid-state effects calculated by both methods are similar and of equal statistical quality when compared with the experimental data.
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The effect of an offset term in the cross-polarization (CP) Hamiltonian of a heteronuclear spin-12 pair due to off-resonant radio frequency (rf) irradiation and/or chemical shift anisotropy on one of the rf channels is investigated. Analytical solutions, simulations, and experimental results are pre
## Abstract Schiff base derivatives of 2โhydroxynaphthylaldehyde were studied by means of ^13^C and ^15^N crossโpolarization magic angle spinning NMR spectroscopy and deuterium isotope effects on ^15^N chemical shifts, ฮN(D), in the solid state. ฮN(D) in the solid state provided evidenced for the p