Substituent effects on Ni-61 NMR chemical shifts

Michael Buehl, Dietmund Peters, Rainer Herges

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Ni-61 chemical shifts of Ni(all-trans-cdt) L (cdt = cyclododecatriene, L = none, CO, PMe3), Ni(CO)(4), Ni(C2H4)(2)(PMe3), Ni(cod)(2) (cod = cyclooctadiene) and Ni(PX3)(4) (X = Me, F, Cl) are computed at the GIAO (gauge-including atomic orbitals), BPW91, B3LYP and BHandHLYP levels, using BP86-optimised geometries and an indirect referencing scheme. For this set of compounds, substituent effects on delta(Ni-61) are better described with hybrid functionals than with the pure BPW91 functional. On going from Ni(all-trans-cdt) to Ni(all-cis-cdt) the computations predict substantial shielding of the Ni-61 nucleus by nearly 700 ppm, as well as a sharp increase of the electric field gradient at this position. The latter result is predicted to afford an undetectably broad Ni-61 NMR line for the all-cis-cdt complex, rationalizing the apparent failure to record the NMR spectrum experimentally.

Original languageEnglish
Pages (from-to)6037-6044
Number of pages8
JournalDalton Transactions
Issue number30
Early online date28 Apr 2009
DOIs
Publication statusPublished - 2009

Keywords

  • Density-functional computation
  • Transition-metal-complexes
  • Correlation-energy
  • Electron-diffraction
  • Aromaticity probe
  • NMR
  • Spectroscopy
  • Exchange
  • Tris(ethylene)nickel(0)
  • Approximation

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