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- W2007659699 abstract "The anisotropic character of the chemical shift can be measured using experiments that provide shift tensor values, and a comparison of the experimental components, obtained from microcrystalline powders, with 3D nuclear shielding tensor components calculated with quantum chemistry yields structural models of the analyzed molecules. The use of a metric tensor for evaluating the mean squared deviations, d 2, between two or more tensors provides a statistical way to verify the molecular structure governing the theoretical shielding components. The sensitivity of the method is comparable to diffraction methods for the heavier organic atoms (i.e., C, O, N, etc.) but considerably better for the positions of H atoms. Thus, the method is especially powerful for H-bond structure, the position of water molecules in biomolecular species, and other proton important structural features, etc. Unfortunately, the traditional Cartesian tensor components appear as a reducible metric representation and lack the orthogonality of irreducible icosahedral and irreducible spherical tensors, both of which are also easy to normalize. Metrics give weighting factors that carry important statistical significance in a structure determination. Details of the mathematical analysis are presented and examples given to illustrate the reason NMR are rapidly assuming an important synergistic relationship with diffraction methods (X-ray, neutron scattering and high-energy synchrotron irradiation). See the companion manusript on by James Harper (Emrstm 1013)." @default.
- W2007659699 created "2016-06-24" @default.
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- W2007659699 date "2009-09-15" @default.
- W2007659699 modified "2023-09-23" @default.
- W2007659699 title "Metric Spaces in NMR Crystallography" @default.
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- W2007659699 doi "https://doi.org/10.1002/9780470034590.emrstm1063" @default.
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