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

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 (1)H and (13)C 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 (13)C shifts is PBE1PBE/aug-cc-pVDZ with CSGT or IGAIM approaches (mae = 1.66 ppm), for (1)H 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 (1)H and (13)C 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.

journal_name

J Mol Model

authors

Toomsalu E,Burk P

doi

10.1007/s00894-015-2787-x

subject

Has Abstract

pub_date

2015-09-01 00:00:00

pages

244

issue

9

eissn

1610-2940

issn

0948-5023

journal_volume

21

pub_type

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