Iridium α-carboxyimine complexes hyperpolarized with parahydrogen exist in nuclear singlet states before conversion into iridium carbonates

Ben J. Tickner, Wissam Iali, Soumya S. Roy, Adrian C. Whitwood, Simon B. Duckett*

*Corresponding author for this work

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The formation and hyperpolarization of an [Ir(H)2(amine)(IMes)(η2-imine)]Cl complex that can be created in a hyperpolarized nuclear singlet state is reported. These complexes are formed when an equilibrium mixture of pyruvate, amine (benzylamine or phenylethylamine), and the corresponding imine condensation product, react with preformed [Ir(H)2(amine)3(IMes)]Cl. These iridium -carboxyimine complexes exist as two regioisomers differentiated by the position of amine. When examined with para-hydrogen the hydride resonances of the isomer with amine trans to hydride become strongly hyperpolarized. The initial hydride singlet states readily transfer to the corresponding 13C2 state in the labelled imine and exhibit magnetic state lifetimes of up to 11 seconds. Their 13C signals have been detected with up to 420 fold signal gains at 9.4 T. On a longer timescale, and in the absence of H2, further reaction leads to the formation of neutral carbonate containing [Ir(amine)(η2-CO3)(IMes)(η2-imine)]. Complexes are characterized by, IR, MS, NMR and X-ray diffraction.
Original languageEnglish
Article numbercphc.201800829
Number of pages6
Early online date10 Sept 2018
Publication statusPublished - 27 Sept 2018

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