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SCFit: Software for single-crystal NMR analysis. Free vs constrained fitting.

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Summary

This study introduces SCFit, a software package for analyzing single-crystal NMR data, handling multiple interactions. It improves tensor analysis precision, particularly for complex 17O and 31P NMR spectra.

Keywords:
Chemical shift tensorHalogen bondOxygen-17Phosphorus-31Quadrupolar couplingSingle-crystal NMRSoftwareSolid-state NMRSpin-spin coupling

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Computational Chemistry
  • Materials Science

Background:

  • Single-crystal NMR spectroscopy provides detailed information on molecular structure and dynamics.
  • Analyzing complex NMR spectra requires sophisticated software capable of handling multiple interacting interactions.

Purpose of the Study:

  • To present the design and implementation of SCFit, a versatile software package for single-crystal NMR data analysis.
  • To demonstrate SCFit's capability in analyzing spectra influenced by chemical shift, quadrupolar coupling, and spin-spin coupling interactions.

Main Methods:

  • Development of the SCFit software package.
  • Application of SCFit to analyze 17O and 31P single-crystal NMR data of triphenylphosphine oxide and its cocrystals.
  • Comparison of unconstrained and constrained fitting strategies for tensor parameter optimization.

Main Results:

  • SCFit successfully analyzes single-crystal NMR spectra involving chemical shift, quadrupolar coupling, and spin-spin coupling.
  • The software was validated using complex 17O NMR data where all four interactions are present.
  • Constrained fitting, utilizing pre-determined tensor parameters, enhanced the precision of tensor orientations in certain cases.

Conclusions:

  • SCFit is a powerful tool for the comprehensive analysis of single-crystal NMR data.
  • The constrained fitting approach offers advantages in refining tensor parameters and improving orientation precision.
  • This work facilitates more accurate structural and dynamic studies using solid-state NMR.