Solvent-Dependent Structure of Iridium Dihydride Complexes: Different Geometries at Low and High Dielectricity of the Medium.
Författare
Summary, in English
The hydride iridium pincer complex [(PCyP)IrH2 ] (PCyP=cis-1,3-bis[(di-tert-butylphosphino)methyl]cyclohexane, 1) reveals remarkably solvent-dependent hydride chemical shifts, isotope chemical shifts, JHD and T1 (min), with rHH increasing upon moving to more polar medium. The only known example of such behaviour (complex [(POCOP)IrH2 ], POCOP=2,6-(tBu2 PO)2 C6 H3 ) was explained by the coordination of a polar solvent molecule to the iridium (J. Am. Chem. Soc. 2006, 128, 17114). Based on the existence of an agostic bond between α-C-H and iridium in 1 in all solvents, we argue that the coordination of solvent can be rejected. DFT calculations revealed that the structures of 1 and [(POCOP)IrH2 ] depend on the dielectric permittivity of the medium and these compounds adopt trigonal-bipyramidal geometries in non-polar media and square-pyramidal geometries in polar media.
Avdelning/ar
Publiceringsår
2016-03-14
Språk
Engelska
Sidor
4078-4086
Publikation/Tidskrift/Serie
Chemistry - A European Journal
Volym
22
Issue
12
Dokumenttyp
Artikel i tidskrift
Förlag
Wiley-Blackwell
Ämne
- Analytical Chemistry
Nyckelord
- density functional calculations
- hydrides
- iridium
- Pincer complexes
- solvent effects
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 1521-3765