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Issue 31, 2014
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The calculation of 29Si NMR chemical shifts of tetracoordinated silicon compounds in the gas phase and in solution

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Abstract

Aiming at the identification of an efficient computational protocol for the accurate NMR assessment of organosilanes in low-polarity organic solvents, 29Si NMR chemical shifts of a selected set of such species relevant in organic synthesis have been calculated relative to tetramethylsilane (TMS, 1) using selected density functional and perturbation theory methods. Satisfactory results are obtained when using triple zeta quality basis sets such as IGLO-III. Solvent effects impact the calculated results through both, changes in substrate geometry as well as changes in the actual shieldings. Spin–orbit (SO) corrections are required for systems carrying more than one chlorine atom directly bonded to silicon. Best overall results are obtained using gas phase geometries optimized at MPW1K/6-31+G(d) level in combination with shielding calculations performed at MPW1K/IGLO-III level in the presence of the PCM continuum solvation model.

Graphical abstract: The calculation of 29Si NMR chemical shifts of tetracoordinated silicon compounds in the gas phase and in solution

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Publication details

The article was received on 22 Apr 2014, accepted on 25 Jun 2014 and first published on 27 Jun 2014


Article type: Paper
DOI: 10.1039/C4CP01736F
Citation: Phys. Chem. Chem. Phys., 2014,16, 16642-16650
  • Open access: Creative Commons BY-NC license
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    The calculation of 29Si NMR chemical shifts of tetracoordinated silicon compounds in the gas phase and in solution

    C. Zhang, P. Patschinski, D. S. Stephenson, R. Panisch, J. H. Wender, M. C. Holthausen and H. Zipse, Phys. Chem. Chem. Phys., 2014, 16, 16642
    DOI: 10.1039/C4CP01736F

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