A new method for calculating nuclear magnetic shielding in solutions is developed based on the reference interaction site model self-consistent field (RISM-SCF) with spatial electron density distribution (SEDD). In RISM-SCF-SEDD, the electrostatic interaction between the solute and the solvent is described by considering the spread of electron to obtain more realistic electronic structure in solutions. It is thus expected to allow us to predict more quantitative chemical shifts of a wide variety of chemical species in solutions. In this study, the method is applied to a water molecule in water and is validated by examining the dependence of the solvent temperature and density on chemical shifts. The dependence of solvent species is also investigated, and more accurate results are obtained for polar solvents compared to the previous RISM-SCF study. Another application example of this method is the 15N chemical shifts of two azines in water, which is difficult to predict with the polarizable continuum model (PCM). Our results are in good agreement with the previous quantum mechanical/molecular mechanics study and experimental results. It is also shown that our method gives more realistic results for methanol and acetone than the PCM.
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21 May 2020
Research Article|
May 18 2020
Nuclear magnetic shielding of molecule in solution based on reference interaction site model self-consistent field with spatial electron density distribution
Kosuke Imamura
;
Kosuke Imamura
1
Department of Molecular Engineering, Graduate School of Engineering, Kyoto University
, Kyoto 615-8510, Japan
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Takeshi Yamazaki
;
Takeshi Yamazaki
2
1QB Information Technologies (1QBit)
, 200-1285 West Pender Street, Vancouver, British Columbia V6E 4B1, Canada
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Daisuke Yokogawa
;
Daisuke Yokogawa
3
Graduate School of Arts and Science, The University of Tokyo
, Komaba, Meguro-ku, Tokyo 153-8902, Japan
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Masahiro Higashi
;
Masahiro Higashi
1
Department of Molecular Engineering, Graduate School of Engineering, Kyoto University
, Kyoto 615-8510, Japan
4
Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University
, Kyoto 615-8520, Japan
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Hirofumi Sato
Hirofumi Sato
a)
1
Department of Molecular Engineering, Graduate School of Engineering, Kyoto University
, Kyoto 615-8510, Japan
4
Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University
, Kyoto 615-8520, Japan
5
Fukui Institute for Fundamental Chemistry, Kyoto University
, Kyoto 606-8103, Japan
a)Author to whom correspondence should be addressed: hirofumi@moleng.kyoto-u.ac.jp
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a)Author to whom correspondence should be addressed: hirofumi@moleng.kyoto-u.ac.jp
J. Chem. Phys. 152, 194102 (2020)
Article history
Received:
March 26 2020
Accepted:
April 27 2020
Citation
Kosuke Imamura, Takeshi Yamazaki, Daisuke Yokogawa, Masahiro Higashi, Hirofumi Sato; Nuclear magnetic shielding of molecule in solution based on reference interaction site model self-consistent field with spatial electron density distribution. J. Chem. Phys. 21 May 2020; 152 (19): 194102. https://doi.org/10.1063/5.0008903
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