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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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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 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.
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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
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High- and low-field NMR in binary solvent gradients.

Haider Hussain1, Paulina Putko2, Dariusz Gołowicz3

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We developed a novel NMR method using solvent composition gradients for rapid chemical analysis. This technique significantly reduces experiment time for determining properties like pKa and improves spectral resolution for complex mixtures.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Nuclear Magnetic Resonance (NMR)

Background:

  • Traditional NMR analysis often requires extensive experimentation across various solvent compositions.
  • Determining properties like pKa for poorly soluble compounds can be time-consuming and labor-intensive.
  • Limited methods exist for efficient spectral analysis of complex mixtures using NMR.

Purpose of the Study:

  • To introduce solvent composition gradients as a new dimension for NMR analysis.
  • To demonstrate the application of this method on both high-field and benchtop NMR instruments.
  • To showcase its utility in accelerating chemical analysis and improving spectral resolution.

Main Methods:

  • Creating solvent composition gradients by layering binary solvent mixtures in an NMR tube.
  • Utilizing spatially resolved NMR techniques like chemical shift imaging (CSI) or sample movement.
  • Analyzing chemical systems as a function of continuous solvent composition variation.

Main Results:

  • Accurate determination of pKa for poorly water-soluble APIs in DMSO/water mixtures, enabling rapid extrapolation to aqueous values.
  • Identification of the minimum solvent composition required to maintain API solubility.
  • Successful transfer of resonance assignments between different solvents and enhanced spectral resolution for complex mixtures.

Conclusions:

  • Solvent composition gradients offer a powerful and efficient approach for NMR analysis.
  • This method significantly reduces experimental time and resources for various applications.
  • The technique is versatile, applicable to both high-field and benchtop NMR instruments for diverse chemical analyses.