13-03

Ligand effects of NHC-iridium catalysts for signal amplification by reversible exchange (SABRE)

Chem. Commun. 49 (2013) 7388-7390

B.J.A. van Weerdenburg, S. Glöggler, N. Eshuis, A.H.J. Engwerda, J.M.M. Smits,

R. de Gelder, S. Appelt, S. Wymenga. M. Tessari, M.C. Feiters, B. Blümich, F.P.J.T. Rutjes,

Abstract: SABRE hyperpolarizes substrates by polarization transfer from para-hydrogen in ametal 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.