Solvent-Dependent Structure of Iridium Dihydride Complexes: Different Geometries at Low and High Dielectricity of the Medium.
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 coordinatio