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Modeling solid-state effects on NMR chemical shifts using electrostatic models.
Nicolas Di Fiori1, Anita M Orendt, M C Caputo
1Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. I, (1428) Buenos Aires, Argentina.
Magnetic Resonance in Chemistry : MRC
|September 15, 2004
Summary
This study compares the embedded ion method (EIM) and surface charge representation of the electrostatic embedding potential (SCREEP) for calculating solid-state effects on NMR chemical shifts. Both methods yield similar, statistically comparable results for (13)C and (15)N chemical shifts.
Area of Science:
- Solid-state chemistry
- Nuclear Magnetic Resonance (NMR) spectroscopy
- Computational chemistry
Background:
- Solid-state effects significantly influence NMR chemical shifts.
- Accurate calculation of these effects is crucial for interpreting solid-state NMR data.
- Two primary computational methods, EIM and SCREEP, are available for this purpose.
Purpose of the Study:
- To compare the efficacy of the embedded ion method (EIM) and the surface charge representation of the electrostatic embedding potential (SCREEP) method.
- To evaluate their performance in calculating solid-state effects on NMR chemical shifts.
- To assess the importance of solid-state effects on (13)C and (15)N chemical shifts.
Main Methods:
- Comparison of EIM and SCREEP computational methods.
- Calculation of solid-state effects on NMR chemical shifts.
- Validation using single-crystal solid-state NMR data and neutron diffraction structures.
Main Results:
- Solid-state effects were confirmed to be important for both (13)C and (15)N chemical shifts.
- Calculated solid-state effects using EIM and SCREEP showed similar trends.
- Both methods demonstrated equal statistical quality when compared to experimental NMR data.
Conclusions:
- EIM and SCREEP are both effective methods for calculating solid-state effects on NMR chemical shifts.
- The choice between EIM and SCREEP may not significantly impact the statistical quality of the results.
- These findings aid in the accurate interpretation of solid-state NMR spectra.