Selective anion effects in chiral complexes of iridium via diffusion and HOESY data: relevance to catalysis

Abstract

¹H and ¹⁹F Pulsed Gradient Spin Echo (PGSE) diffusion data, together with ¹H, ¹⁹F-HOESY results are shown to distinguish between different types of anion/cation interactions in chiral dihydrido-P,N-complexes of Ir(III); in CD₂Cl₂ the diffusion coefficients, D, for the BArF and the Ir-cation suggest ion-pairing whereas the D-values for PF₆⁻ reveal independent motion; the PF₆⁻ approaches the cation via a specific pathway; the combined PGSE/HOESY approach offers a unique opportunity for exploring anion effects in organometallic/catalytic chemistry.