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Updated: Jun 12, 2026

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
13:56

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Published on: October 12, 2019

极相NaNbO(3):通过粉末衍射,固态NMR和第一原则计算的综合研究

Karen E Johnston1, Chiu C Tang, Julia E Parker

  • 1School of Chemistry and EaStCHEM, University of St. Andrews, UK.

Journal of the American Chemical Society
|June 5, 2010
PubMed
概括

研究人员使用sol-gel方法合成了酸 (NaNbO3) 的新型极相. 这一新阶段,与已知的多态形态相结合,具有特征,揭示了不同的位和潜在的微妙扭曲.

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Other Nuclides: 31P, 19F, 15N NMR01:16

Other Nuclides: 31P, 19F, 15N NMR

Many organic, inorganic, and biological molecules contain spin-half nuclei such as nitrogen-15, fluorine-19, and phosphorus-31. As a result, NMR studies of these nuclei have found extensive applications in chemical and biological research.
While fluorine-19 and phosphorous-31 have high natural abundances (100%) and positive gyromagnetic ratios, nitrogen-15 has a low natural abundance and a negative gyromagnetic ratio. However, nitrogen-15 is still preferred over nitrogen-14 (which has a high...
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¹H NMR: Complex Splitting

A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.