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Related Concept Videos

2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

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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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Carbon-13 (¹³C) NMR: Overview01:10

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Carbon-13 is a naturally occurring NMR-active isotope of carbon with a low natural abundance of 1.1%. In contrast, carbon-12 is the most abundant isotope of carbon with zero nuclear spin. Therefore, it is NMR inactive. The gyromagnetic ratio of carbon-13 is smaller than that of protons. As a result, carbon-13 resonance is about 6000 times weaker than proton resonance. For a given magnetic field strength, the resonance frequency of carbon-13 is about one-fourth of the resonance frequency for...
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Mass Spectrometry: Isotope Effect01:13

Mass Spectrometry: Isotope Effect

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Most elements exist in nature as a mixture of isotopes. The isotopes differ in weight due to their respective number of neutrons. The molecular weight of a molecule is different depending on the specific isotope of its elements involved. As a result, the mass spectrum of the molecule exhibits peaks from the same fragment at multiple positions. The positions of these mass signals depend on the mass differences between isotopes. Furthermore, the intensity of these signals is dependent on the...
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¹³C NMR: ¹H–¹³C Decoupling01:04

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
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2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

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Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
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NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

2.0K
NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
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What can we learn from N2 O isotope data? - Analytics, processes and modelling.

Longfei Yu1,2, Eliza Harris3, Dominika Lewicka-Szczebak4

  • 1Laboratory for Air Pollution & Environmental Technology, Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf, CH-8600, Switzerland.

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Summary
This summary is machine-generated.

Nitrous oxide (N2 O) isotope analysis helps identify sources and budgets, but multiple pathways complicate interpretation. Future research should refine analytical techniques and modeling for better understanding of N2 O processes.

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Atmospheric Chemistry

Background:

  • Nitrous oxide (N2 O) isotope composition offers insights into its sources and budgets.
  • Quantifying distinct N2 O processes is challenging due to multiple transformation pathways and spatiotemporal variability.

Purpose of the Study:

  • To review recent advancements in N2 O isotopic studies.
  • To suggest future research directions focusing on analytical techniques, N2 O production/consumption, and interpretation/modeling.

Main Methods:

  • Comparison of isotope-ratio mass spectrometry (IRMS) for lab analysis and laser absorption spectroscopy (LAS) for in situ studies.
  • Analysis of isotopic fractionation effects at molecular and larger scales.
  • Application of dual isotope plots for process attribution.
  • Development and evaluation of process-based N2 O isotopic models.

Main Results:

  • IRMS provides precise lab N2 O isotope analysis; LAS is suitable for in situ/site-specific studies.
  • Molecular-scale isotopic effects are enzyme-specific; larger scales involve process mixing and variability.
  • Dual isotope plots aid semi-quantitative attribution of N2 O processes.
  • Process-based models show effectiveness, especially with high temporal resolution data.

Conclusions:

  • Significant progress in N2 O isotope studies necessitates further work on analytical techniques, reference materials, inter-laboratory comparisons, and mechanistic/modeling approaches.
  • Continued research will enhance understanding of N2 O transformation processes and improve global budget constraints.
  • Future efforts aim to refine N2 O source attribution and management strategies.