Reaction field effects on nitrogen shielding

Chang Guo Zhan, Daniel M. Chipman

Research output: Contribution to journalArticlepeer-review

95 Scopus citations

Abstract

Solvation effects on nuclear magnetic shielding at nitrogen in the CH3CN, CH3NO2, CH3NCS, and CH3ONO2 molecules are studied using electronic structure calculations. Reaction field theory together with a dielectric continuum is invoked to describe solute-solvent electrostatic interactions, using a solute electronic isodensity contour to define the cavity surface. With the common approach that treats only surface polarization effects, it is found that the nitrogen shielding is very sensitive to the cavity size and usually provides results in reasonable agreement with experiment only for rather large cavity sizes corresponding to contour values of ∼0.000 25-0.0005 a.u. With a more complete treatment that also includes volume polarization effects arising from penetration of the solute charge density outside the cavity, the nitrogen shielding becomes much less sensitive to the cavity size and reasonable agreement with experiment can be obtained with contour values ∼0.001-0.003 a.u., which is more consistent with previous findings on the optimum cavity size for determination of free energies of solvation.

Original languageEnglish
Pages (from-to)1611-1622
Number of pages12
JournalJournal of Chemical Physics
Volume110
Issue number3
DOIs
StatePublished - Jan 15 1999

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry

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