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Updated: Sep 19, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Published on: April 10, 2018

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NMRシグネチャからのPt単原子触媒の調整環境

Jonas Koppe1, Alexander V Yakimov2,3, Domenico Gioffrè2

  • 1Centre de RMN à Très Hauts Champs de Lyon, CNRS/Ecole Normale Supérieure de Lyon/Université Claude Bernard Lyon 1, Villeurbanne, France.

Nature
|June 4, 2025
PubMed
まとめ

核磁共振 (NMR) スペクトロスコーピーは,プラチナ-195 (195Pt) のNMRスペクトルを分析することによって,単原子触媒 (SAC) を正確に特徴付けます. この方法は,高度な触媒材料の開発に役立つ原子調整環境を明らかにします.

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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR14:44

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¹H NMR: Long-Range Coupling

The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
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¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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