Fig. 2. Comparison of thermally polarized (top) and SABRE hyperpolarized (bottom) 1H NMR spectra of 52 mM pyridine with 5.2 mM catalyst in methanol-d4 for NMR detection at (A) 9.4 T and (B) 1 T. (C) SABRE enhancement factor, ε, and (D) polarization level, P, for the ortho resonance (blue triangle) as a function of substrate concentration with NMR detection at 1 T (gray) and 9.4 T (green). Error bars represent the standard deviation across 5 measurements.
