Structure of crystalline phosphates from P-31 double-quantum NMR spectroscopy
1996
31P multiple-quantum solid-state NMR spectroscopy is introduced as a new approach for elucidating internuclear distances between phosphorus nuclei in phosphates. The typical shorter distance between chemically bound groups allows the determination of the chemical network. The method is superior to 31P exchange experiments, which, in principle, provide similar information. Separation of two crystalline Mg2P2O7 phases is observed by both methods, but the double-quantum experiment gives further information of couplings between sites with equal isotropic chemical shifts. In Ca2P6Ol7, which contains Q2 and Q3 groups with large chemical shift anisotropies, the connectivities can be deduced from the double-quantum experiment due to different cross-peak intensities. Our results are in good agreement with X-ray diffraction measurements and suggest applications to other, more complicated phosphates.
Keywords:
- Nuclear magnetic resonance spectroscopy
- Carbon-13 NMR
- Nuclear magnetic resonance crystallography
- Carbon-13 NMR satellite
- Chemical shift
- Nuclear magnetic resonance spectroscopy of nucleic acids
- Transverse relaxation-optimized spectroscopy
- Two-dimensional nuclear magnetic resonance spectroscopy
- Nuclear magnetic resonance
- Chemistry
- Inorganic chemistry
- Deuterium NMR
- Chemical physics
- Fluorine-19 NMR
- Correction
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