Computational Insight into Rh-103 Chemical Shift-Structure Correlations in Rhodium Bis(phosphine) Complexes

Manuel A. Ortuno, Ludovic Castro, Michael Buehl*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

103RhNMR chemical shifts have been computed at the GIAO-B3LYP level of density functional theory (DFT) for a number of [Rh(COD)(P∩P)]+ complexes [COD = 1,5-cyclooctadiene, P∩P = chelating bis(phosphine) including
bis(dimethylphosphino)ethane (dmpe), bis(diphenylphosphino)ethane (dmpe),
MeDUPHOS, DIOP, BINAP, and others]. Structures have been optimized using PBE0
and M06 functionals in the gas phase, in a continuum modeling the solvent, and
with [PF6]counteranion included explicitly. Observed trends in δ(103Rh)
are well reproduced for pristine PBE0-optimized cations in the gas phase or for
ion pairs optimized in a continuum with M06. While there is no overall trend
between computed δ(103Rh) values and complex stabilities (evaluated through isodesmic ligand exchange reactions), there is a linear relationship between the 103Rh chemical shifts and the mean Rh–P bond distances. This relationship appears to be remarkably general, encompassing various chelating ring sizes and
substituents at P, including remote electron-donating and -withdrawing
substituents that are characterized through their Hammett constants. The
combination of 103Rh NMR and DFT computations emerges as a useful tool for structure elucidation of Rh–phosphine complexes.

Original languageEnglish
Pages (from-to)6437-6444
Number of pages8
JournalOrganometallics
Volume32
Issue number21
Early online date4 Oct 2013
DOIs
Publication statusPublished - 11 Nov 2013

Keywords

  • Density-functional theory
  • Transition-metal-complexes
  • Molecular orbital methods
  • NMR spectroscopy
  • Basis sets
  • Organometallic complexes
  • Noncovalent interactions
  • Diolefin complexes
  • Shielding tensors
  • Olefin complexes

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