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Related Concept Videos

¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

1.3K
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...
1.3K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.1K
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.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.1K
¹H NMR Signal Integration: Overview00:58

¹H NMR Signal Integration: Overview

1.6K
The intensity of a signal, which can be represented by the area under the peak, depends on the number of protons contributing to that signal. The area under each peak is shown as a vertical line called an integral, with the integral value listed under it, as seen in the proton NMR spectrum of benzyl acetate. Each integral value is divided by the smallest integral value to obtain the ratio of the number of protons producing each signal. The ratio reveals the relative number of protons and not...
1.6K
Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

1.4K
In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
1.4K
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

256
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...
256
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

802
Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
802

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Rational method for defining and quantifying pseudo-components based on NMR spectroscopy.

Thomas Specht1, Kerstin Münnemann1, Hans Hasse1

  • 1Laboratory of Engineering Thermodynamics (LTD), RPTU Kaiserslautern, Erwin-Schrödinger-Straße 44, 67663 Kaiserslautern, Germany. fabian.jirasek@rptu.de.

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This summary is machine-generated.

This study introduces a new, automated method using nuclear magnetic resonance (NMR) to define and quantify pseudo-components in unknown chemical mixtures, simplifying process modeling.

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Area of Science:

  • Chemical Engineering
  • Biochemical Engineering
  • Analytical Chemistry

Background:

  • Poorly specified chemical mixtures with unknown compositions are common in engineering.
  • Current methods for analyzing these mixtures are often complex and assumption-dependent.

Purpose of the Study:

  • To develop a rational, automated method for defining and quantifying pseudo-components in poorly specified mixtures.
  • To reduce the need for tedious structure elucidation in mixture analysis.

Main Methods:

  • Utilizes standard nuclear magnetic resonance (NMR) experiments.
  • Analyzes mixture composition by identifying structural groups.
  • Clusters structural groups into pseudo-components using self-diffusion coefficients from pulsed-field gradient (PFG) NMR spectroscopy.

Main Results:

  • Successfully demonstrated the method on various aqueous mixtures.
  • The approach is free of ad hoc assumptions and automatable.
  • Provides accurate pseudo-component quantification.

Conclusions:

  • The proposed NMR-based method offers a robust solution for characterizing poorly specified mixtures.
  • Enables improved modeling and simulation of processes involving complex mixtures.
  • Applicable for process monitoring and reducing analytical costs.