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Related Concept Videos

¹H NMR Signal Multiplicity: Splitting Patterns01:13

¹H NMR Signal Multiplicity: Splitting Patterns

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When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

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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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2D NMR: Overview of Heteronuclear Correlation Techniques01:18

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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: Complex Splitting01:13

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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.
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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...
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The Concept of Multiple Allelism
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Implementing multiplicity editing in selective HSQMBC experiments.

Josep Saurí1, Eduard Sistaré2, R Thomas Williamson3

  • 1Servei de Ressonància Magnètica Nuclear, Universitat Autònoma de Barcelona, Facultat de Ciències, E-08193 Bellaterra (Barcelona), Catalonia, Spain; NMR Structure Elucidation, Process and Analytical Chemistry, Merck & Co. Inc., 126 E. Lincoln Avenue, Rahway, NJ 07065, USA.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|February 24, 2015
PubMed
Summary
This summary is machine-generated.

A new Multiplicity-Edited (ME)-selHSQMBC experiment distinguishes carbon-multiplicity information using peak phases. This method precisely determines long-range coupling constants and enhances sensitivity with broadband homonuclear decoupling.

Keywords:
HOBSHSQMBCHeteronuclear coupling constantsIPAPMultiplicity-editing

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Organic Chemistry
  • Structural Biology

Background:

  • Distinguishing carbon (C) types (e.g., CH, CH2, CH3) is crucial for molecular structure elucidation.
  • Traditional NMR methods can be complex and time-consuming for detailed multiplicity analysis.
  • Accurate determination of long-range heteronuclear coupling constants (nJ(C,H)) aids in structural assignments.

Purpose of the Study:

  • To introduce a novel Multiplicity-Edited (ME)-selHSQMBC experiment for direct carbon-multiplicity differentiation.
  • To demonstrate the compatibility of the experiment for precise long-range heteronuclear coupling constant determination.
  • To enhance NMR sensitivity and signal resolution through integrated techniques.

Main Methods:

  • Development and application of a novel ME-selHSQMBC NMR experiment.
  • Utilizing the relative positive/negative phase of cross-peaks for multiplicity editing.
  • Incorporation of TOCSY (Total Correlation Spectroscopy) for spectral editing extension.
  • Application of broadband homonuclear decoupling techniques.

Main Results:

  • Direct distinction between even (CH/CH2) and odd (CH/CH3) carbon multiplicities based on cross-peak phase.
  • Simultaneous and precise determination of long-range heteronuclear coupling constants.
  • Enhanced sensitivity and signal resolution achieved through J(HH) multiplet collapse via homonuclear decoupling.

Conclusions:

  • The novel ME-selHSQMBC experiment provides a direct and efficient method for carbon-multiplicity assignment in NMR.
  • The technique is versatile, allowing for simultaneous measurement of coupling constants and improved spectral quality.
  • This advancement offers significant benefits for complex molecule structure determination and analysis.