Kim, Sarah, Sein Min, Heelim Chae, Hye Jin Jeong, Sung Keon Namgoong, Sangwon Oh, and Keunhong Jeong. “Hyperpolarization of Nitrile Compounds Using Signal Amplification by Reversible Exchange.” Molecules 25, no. 15 (July 23, 2020): 3347.
Signal Ampliﬁcation by Reversible Exchange (SABRE), a hyperpolarization technique, has been harnessed as a powerful tool to achieve useful hyperpolarized materials by polarization transfer from parahydrogen. In this study, we systemically applied SABRE to a series of nitrile compounds, which have been rarely investigated. By performing SABRE in various magnetic ﬁelds and concentrations on nitrile compounds, we unveiled its hyperpolarization properties to maximize the spin polarization and its transfer to the next spins. Through this sequential study, we obtained a ~130-fold enhancement for several nitrile compounds, which is the highest number ever reported for the nitrile compounds. Our study revealed that the spin polarization on hydrogens decreases with longer distances from the nitrile group, and its maximum polarization is found to be approximately 70 G with 5 µL of substrates in all structures. Interestingly, more branched structures in the ligand showed less eﬀective polarization transfer mechanisms than the structural isomers of butyronitrile and isobutyronitrile. These ﬁrst systematic SABRE studies on a series of nitrile compounds will provide new opportunities for further research on the hyperpolarization of various useful nitrile materials.