Regression formulas for density functional theory calculated 1H and 13C NMR chemical shifts in toluene- d 8

Ivan A. Konstantinov, Linda J Broadbelt*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

This study aimed at investigating the performance of a series of basis sets, density functional theory (DFT) functionals, and the IEF-PCM solvation model in the accurate calculation of 1H and 13C NMR chemical shifts in toluene-d8. We demonstrated that, on a test set of 37 organic species with various functional moieties, linear scaling significantly improved the calculated shifts and was necessary to obtain more accurate results. Inclusion of a solvation model produced larger deviations from the experimental data as compared to the gas-phase calculations. Moreover, we did not find any evidence that very large basis sets were necessary to reproduce the experimental NMR data. Ultimately, we recommend the use of the BMK functional. For the 1H shifts the use of the 6-311G(d) basis set gave linearly scaled mean unsigned (MU) and root-mean-square (rms) errors of 0.15 ppm and 0.21 ppm, respectively. For the calculation of the 13C chemical shifts the 6-31G(d) basis set produced MUE of 1.82 ppm and RMSE of 3.29 ppm.

Original languageEnglish (US)
Pages (from-to)12364-12372
Number of pages9
JournalJournal of Physical Chemistry A
Volume115
Issue number44
DOIs
StatePublished - Nov 10 2011

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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