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

Bram J. A. van Weerdenburg; Stefan Glöggler; Nan Eshuis; A. H. J. (Ton) Engwerda; Jan M. M. Smits; René de Gelder; Stephan Appelt; Sybren S. Wymenga; Marco Tessari; Martin C. Feiters; Bernhard Blümich; Floris P. J. T. Rutjes

doi:10.1039/C3CC43423K

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

Bram J. A. van Weerdenburg,^a Stefan Glöggler,^b Nan Eshuis,^a A. H. J. (Ton) Engwerda,^a Jan M. M. Smits,^a René de Gelder,^a Stephan Appelt,^bc Sybren S. Wymenga,^a Marco Tessari,^a Martin C. Feiters,*^a Bernhard Blümich^b and Floris P. J. T. Rutjes^a

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* Corresponding authors

^a Radboud University Nijmegen, Institute for Molecules and Materials, Heyendaalseweg 135, 65625 AJ Nijmegen, The Netherlands
E-mail: m.feiters@science.ru.nl
Fax: +31 24 36 53393
Tel: +31 24 36 52016

^b RWTH Aachen, Institut für Technische und Makromolekulare Chemie, Worringerweg 1, 52074 Aachen, Germany
E-mail: stgloeggler@gmx.de
Tel: +49 241 80 20469

^c Central Institute for Electronics, Research Center Jülich, Wilhelm-Johnen-Straße, 52428 Juelich, Germany
E-mail: st.appelt@fz-juelich.de
Tel: +49 2461 61 3884

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.

Chemical Communications

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

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

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