Figure 3.

Comparison between the ¹⁵N HET-SABRE-SHEATH result in Figure 2(a) and a corresponding ¹⁵N SABRE-SHEATH spectrum obtained with the standard homogenous catalyst (b). The ¹⁵N-py concentrations were 100 mM and 50 mM, respectively and both spectra are presented in the same vertical scale. The inset shows the expected presence of bound substrate resonances in the spectrum obtained with the homogeneous catalyst, and the apparent absence of bound substrate peaks for the heterogeneous system.