title: Using signal amplification by reversible exchange (SABRE) to hyperpolarise119Sn and29Si NMR nuclei.
abstract: The hyperpolarisation of the119Sn and29Si nuclei in 5-(tributylstannyl)pyrimidine (ASn) and 5-(trimethylsilyl)pyrimidine (BSi) is achieved through their reaction with [IrCl(COD)(IMes)] (1a) or [IrCl(COD)(SIMes)] (1b) and parahydrogen via the SABRE process. 1a exhibits superior activity in both cases. The two inequivalent pyrimidine proton environments of ASnreadily yielded signal enhancements totalling ∼2300-fold in its1H NMR spectrum at a field strength of 9.4 T, with the corresponding119Sn signal being 700 times stronger than normal. In contrast, BSiproduced analogous1H signal gains of ∼2400-fold and a29Si signal that could be detected with a signal to noise ratio of 200 in a single scan. These sensitivity improvements allow NMR detection within seconds using micromole amounts of substrate and illustrate the analytical potential of this approach for high-sensitivity screening. Furthermore, after extended reaction times, a series of novel iridium trimers of general form [Ir(H)2Cl(NHC)(μ-pyrimidine-κN:κN')]3precipitate from these solutions whose identity was confirmed crystallographically for BSi.
authors.affiliation: Department of Chemistry, University of York, Heslington, York YO10 5DD, UK. simon.duckett@york.ac.uk.
authors.forename: Alexandra M
authors.initials: AM
authors.lastname: Olaru
authors.affiliation: Department of Chemistry, University of York, Heslington, York YO10 5DD, UK. simon.duckett@york.ac.uk.
authors.forename: Alister
authors.identifier: 0000-0002-9341-2295
authors.initials: A
authors.lastname: Burt
authors.affiliation: Department of Chemistry, University of York, Heslington, York YO10 5DD, UK. simon.duckett@york.ac.uk.
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Rayner
authors.affiliation: Department of Chemistry, University of York, Heslington, York YO10 5DD, UK. simon.duckett@york.ac.uk.
authors.forename: Sam J
authors.initials: SJ
authors.lastname: Hart
authors.affiliation: Department of Chemistry, University of York, Heslington, York YO10 5DD, UK. simon.duckett@york.ac.uk.
authors.forename: Adrian C
authors.initials: AC
authors.lastname: Whitwood
authors.affiliation: Department of Chemistry, University of York, Heslington, York YO10 5DD, UK. simon.duckett@york.ac.uk.
authors.forename: Gary G R
authors.initials: GGR
authors.lastname: Green
authors.affiliation: Department of Chemistry, University of York, Heslington, York YO10 5DD, UK. simon.duckett@york.ac.uk.
authors.forename: Simon B
authors.identifier: 0000-0002-9788-6615
authors.initials: SB
authors.lastname: Duckett
mesh_terms: D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D012815:Signal Processing, Computer-Assisted; D012825:Silicon / Q000737:chemistry*; D014001:Tin / Q000737:chemistry*
chemical_list: D014001:Tin; D012825:Silicon