Lindale, Jacob R., Christian P.N. Tanner, Shannon L. Eriksson, and Warren S. Warren. “Decoupled LIGHT-SABRE Variants Allow Hyperpolarization of Asymmetric SABRE Systems at an Arbitrary Field.” Journal of Magnetic Resonance 307 (October 2019): 106577.
Signal Ampliﬁcation By Reversible Exchange, or SABRE, uses the singlet-order of parahydrogen to generate hyperpolarized signals on target nuclei, bypassing the limitations of traditional magnetic resonance. Experiments performed directly in the magnet provide a route to generate large magnetizations continuously without having to ﬁeld-cycle the sample. For heteronuclear SABRE, these high-ﬁeld methods have been restricted to the few SABRE complexes that exhibit efﬁcient exchange with symmetric ligand environments as co-ligands induce chemical shift differences between the parahydrogen-derived hydrides, destroying the hyperpolarized spin order. Through careful consideration of the underlying spin physics, we introduce 1H decoupled LIGHT-SABRE pulse sequence variants which bypasses this limitation, drastically expanding the scope of heteronuclear SABRE at high ﬁeld.