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Related Concept Videos

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

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

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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...
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¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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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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Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

913
The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
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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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¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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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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Rapid quantitative 1H-13C two-dimensional NMR with high precision.

Yu-Shan Wu1, Bai-Xiang Li2, Ying-Yun Long2

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|April 15, 2022
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Summary

Precise quantitative analysis of linear low density polyethylene (LLDPE) is improved using optimized two-dimensional 1H-13C heteronuclear single-quantum correlation (HSQC) spectroscopy. Time-saving strategies like nonuniform sampling (NUS) and band-selective HSQC achieve high accuracy in polymer composition determination.

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Area of Science:

  • Polymer Chemistry
  • Analytical Chemistry
  • Spectroscopy

Background:

  • Quantitative determination of linear low density polyethylene (LLDPE) using 2D 1H-13C HSQC requires high precision.
  • Optimizing experimental conditions is crucial for reliable quantification of polymer composition.

Purpose of the Study:

  • To determine the optimal conditions for achieving high precision in 2D 1H-13C HSQC analysis of LLDPE.
  • To evaluate time-saving strategies for enhanced precision and accuracy in polymer quantification.

Main Methods:

  • Utilized optimized parameters for 2D 1H-13C HSQC spectroscopy.
  • Evaluated nonuniform sampling (NUS) and band-selective HSQC on model poly(ethylene-co-1-hexene)s.
  • Assessed repeatability for ethylene (E mol%) and 1-hexene (H mol%) content determination.

Main Results:

  • Achieved precision better than 0.3% for E mol% and 5% for H mol% using 50% NUS or band-selective HSQC.
  • Demonstrated dramatic precision enhancements (better than 0.15% for E mol% and 2.5% for H mol%) with combined band-selective HSQC and 50% NUS.
  • Reduced experiment times to approximately 0.5 hours.

Conclusions:

  • Optimized 2D 1H-13C HSQC with NUS and band-selective techniques enables rapid, precise, and accurate quantitative analysis of complex polymers.
  • These advanced spectroscopic methods offer significant improvements for polymer characterization.
  • The study highlights the potential for efficient and reliable compositional analysis in polymer science.