Heterogeneous Microtesla SABRE Enhancement of ¹⁵ N NMR Signals.

ABSTRACT: The hyperpolarization of heteronuclei via signal amplification by reversible exchange (SABRE) was investigated under conditions of heterogeneous catalysis and microtesla magnetic fields. Immobilization of [IrCl(COD)(IMes)], [IMes=1,3-bis(2,4,6-trimethylphenyl), imidazole-2-ylidene; COD=cyclooctadiene] catalyst onto silica particles modified with amine linkers engenders an effective heterogeneous SABRE (HET-SABRE) catalyst that was used to demonstrate a circa 100-fold enhancement of ¹⁵ N NMR signals in ¹⁵ N-pyridine at 9.4 T following parahydrogen bubbling within a magnetic shield. No ¹⁵ N NMR enhancement was observed from the supernatant liquid following catalyst separation, which along with XPS characterization supports the fact that the effects result fro

SUBMITTER: Kovtunov KV 

PROVIDER: S-EPMC5561492 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature