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Journal of Molecular Modeling

, 21:244 | Cite as

Critical test of some computational methods for prediction of NMR 1H and 13C chemical shifts

  • Eve Toomsalu
  • Peeter Burk
Original Paper

Abstract

Performance of 18 DFT functionals (B1B95, B3LYP, B3PW91, B97D, BHandHLYP, BMK, CAM-B3LYP, HSEh1PBE, M06-L, mPW1PW91, O3LYP, OLYP, OPBE, PBE1PBE, tHCTHhyb, TPSSh, wB97xD, VSXC) in combinations with six basis sets (cc-pVDZ, aug-cc-pVDZ, cc-pVTZ, aug-cc-pVTZ, IGLO-II, and IGLO-III) and three methods for calculating magnetic shieldings (GIAO, CSGT, IGAIM) was tested for predicting 1H and 13C chemical shifts for 25 organic compounds, for altogether 86 H and 88 C atoms. Proton shifts varied between 1.03 ppm to 12.00 ppm and carbon shifts between 7.87 ppm to 209.28 ppm. It was found that the best method for calculating 13C shifts is PBE1PBE/aug-cc-pVDZ with CSGT or IGAIM approaches (mae = 1.66 ppm), for 1H the best results were obtained with HSEh1PBE, mPW1PW91, PBE1PBE, CAM-B3LYP, and B3PW91 functionals with cc-pVTZ basis set and with CSGT or IGAIM approaches (mae = 0.28 ppm). We found that often larger basis sets do not give better results for chemical shifts. The best basis sets for calculating 1H and 13C chemical shifts were cc-pVTZ and aug-cc-pVDZ, respectively. CSGT and IGAIM NMR approaches can perform really well and are in most cases better than popular GIAO approach.

Graphical Abstract

Mean absolute errors for 1H and 13C chemical shifts and computational times of neutral toluene molecule with aug-cc-pVDZ basis set and CSGT approach

Keywords

Chemical shifts CSGT DFT calculations NMR calculations GIAO IGAIM 

Notes

Acknowledgments

This work was supported by the Estonian Science Foundation (Grant No. 8809) and institutional research funding (IUT20-15) of the Estonian Ministry of Education and Research.

Supplementary material

894_2015_2787_MOESM1_ESM.pdf (4.7 mb)
ESM 1 (PDF 4819 kb)

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© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Institute of ChemistryUniversity of TartuTartuEstonia

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