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Complete magnetic field dependence of SABRE ‐derived polarization
Author(s) -
Kiryutin Alexey S.,
Yurkovskaya Alexandra V.,
Zimmermann Herbert,
Vieth HansMartin,
Ivanov Konstantin L.
Publication year - 2018
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.4694
Subject(s) - spin isomers of hydrogen , chemistry , polarization (electrochemistry) , hyperpolarization (physics) , magnetic field , singlet state , induced polarization , molecular physics , nuclear magnetic resonance , atomic physics , nuclear magnetic resonance spectroscopy , physics , excited state , stereochemistry , hydrogen , organic chemistry , quantum mechanics , electrical resistivity and conductivity
Signal amplification by reversible exchange (SABRE) is a promising hyperpolarization technique, which makes use of spin‐order transfer from parahydrogen (the H 2 molecule in its singlet spin state) to a to‐be‐polarized substrate in a transient organometallic complex, termed the SABRE complex. In this work, we present an experimental method for measuring the magnetic field dependence of the SABRE effect over an ultrawide field range, namely, from 10 nT to 10 T. This approach gives a way to determine the complete magnetic field dependence of SABRE‐derived polarization. Here, we focus on SABRE polarization of spin‐1/2 hetero‐nuclei, such as 13 C and 15 N and measure their polarization in the entire accessible field range; experimental studies are supported by calculations of polarization. Features of the field dependence of polarization can be attributed to level anticrossings in the spin system of the SABRE complex. Features at magnetic fields of the order of 100 nT–1 μT correspond to “strong coupling” of protons and hetero‐nuclei, whereas features found in the mT field range stem from “strong coupling” of the proton system. Our approach gives a way to measuring and analyzing the complete SABRE field dependence, to probing NMR parameters of SABRE complexes and to optimizing the polarization value.