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Aromatic compounds can be identified or analyzed using proton NMR and carbon‐13 NMR. Typically, aromatic hydrogens or hydrogens directly bonded to the aromatic rings are strongly deshielded by the aromatic ring current. Therefore, they absorb in the range of 6.5–8.0 ppm in proton NMR spectra. For instance, aromatic hydrogens directly bonded to the benzene ring absorb at 7.3 ppm. However, aromatic hydrogens of larger rings absorb farther upfield or downfield than the ideal range.
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Evaluation of benchtop NMR Diffusion Ordered Spectroscopy for small molecule mixture analysis.

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Diffusion Ordered Spectroscopy (DOSY) on benchtop NMR instruments successfully analyzes complex mixtures. This method accurately identifies compounds even with overlapping spectra and similar diffusion coefficients, making it valuable for various chemical analyses.

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Area of Science:

  • Analytical Chemistry
  • Nuclear Magnetic Resonance (NMR) Spectroscopy

Background:

  • Diffusion Ordered Spectroscopy (DOSY) separates liquid-state chemical mixtures by molecular weight.
  • DOSY has potential applications in forensics, reaction analysis, quality control, and fraud detection, similar to LC-MS.
  • Benchtop NMR instruments offer lower spectral dispersion and sensitivity, leading to spectral overlap issues in mixtures.

Purpose of the Study:

  • To evaluate the performance of existing high-field DOSY pulse sequences and processing methods on a 43 MHz benchtop NMR instrument.
  • To demonstrate the capability of benchtop DOSY for analyzing complex mixtures with overlapping spectra and varying diffusion coefficients.

Main Methods:

  • Utilized existing high-field DOSY pulse sequences and processing techniques on a 43 MHz benchtop NMR spectrometer.
  • Analyzed molecular mixtures with constituents exhibiting 20% and 50% differences in diffusion coefficients.
  • Employed a bespoke spectral library for matching and identification of mixture components.

Main Results:

  • Successful identification of mixture constituents with 20% diffusion coefficient differences and significant spectral overlap.
  • Accurate identification of mixture components with severe spectral overlap and 50% diffusion coefficient differences.
  • Demonstrated the effectiveness of benchtop NMR for DOSY analysis, overcoming limitations of lower field strength.

Conclusions:

  • Existing high-field DOSY pulse sequences and processing methods perform effectively on benchtop NMR instruments at 43 MHz.
  • Benchtop DOSY can accurately analyze complex mixtures, even with substantial spectral overlap and minor diffusion coefficient variations.
  • The combination of benchtop NMR and modern DOSY techniques offers a promising, accessible solution for research and industrial chemistry laboratories.