title: Ligand effects of NHC-iridium catalysts for signal amplification by reversible exchange (SABRE).
abstract: SABRE hyperpolarizes substrates by polarization transfer from para-hydrogen in a metal complex. We have measured the signal enhancement of pyridine and its exchange rate in various [Ir(NHC)(Py)3(H)2](+) complexes to gain insight into their dependence on the N-Heterocyclic Carbene (NHC) ligand's steric and electronic properties.
authors.affiliation: Radboud University Nijmegen, Institute for Molecules and Materials, Heyendaalseweg 135, 65625 AJ Nijmegen, The Netherlands.
authors.forename: Bram J A
authors.initials: BJ
authors.lastname: van Weerdenburg
authors.forename: Stefan
authors.initials: S
authors.lastname: Glöggler
authors.forename: Nan
authors.initials: N
authors.lastname: Eshuis
authors.forename: A H J Ton
authors.initials: AH
authors.lastname: Engwerda
authors.forename: Jan M M
authors.initials: JM
authors.lastname: Smits
authors.forename: René
authors.initials: R
authors.lastname: de Gelder
authors.forename: Stephan
authors.initials: S
authors.lastname: Appelt
authors.forename: Sybren S
authors.initials: SS
authors.lastname: Wymenga
authors.forename: Marco
authors.initials: M
authors.lastname: Tessari
authors.forename: Martin C
authors.initials: MC
authors.lastname: Feiters
authors.forename: Bernhard
authors.initials: B
authors.lastname: Blümich
authors.forename: Floris P J T
authors.initials: FP
authors.lastname: Rutjes
mesh_terms: D002384:Catalysis; D056831:Coordination Complexes / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry; D007495:Iridium / Q000737:chemistry*; D008024:Ligands; D008697:Methane / Q000031:analogs & derivatives* / Q000737:chemistry; D011725:Pyridines / Q000737:chemistry*
chemical_list: D056831:Coordination Complexes; D008024:Ligands; D011725:Pyridines; C030011:carbene; D007495:Iridium; D006859:Hydrogen; C023666:pyridine; D008697:Methane