. Author manuscript; available in PMC: 2015 Jul 14.

Published in final edited form as: J Phys Chem C Nanomater Interfaces. 2015 Mar 11;119(13):7525–7533. doi: 10.1021/acs.jpcc.5b02036

Table 1.

Polarization enhancement (ɛ) values for three aromatic proton sites of pyridine (Figures 4, 5, & 7) achieved via conventional (ex situ, low-field) SABRE and detected by high-resolution ¹H NMR spectroscopy using the nanoscale catalysts (PVPCs or NPCs) in d₆-ethanol or d₄-methanol. Reported ɛ values are calculated from spectral integrals and are approximate, with estimated uncertainties of ~10%. Numbers in parentheses are pH₂ bubbling times.

Catalyst	ɛ(H_o)	ɛ (H_p)	ɛ (H_m)
PVPCs (30 s)	−7	−6	−3
NPCs (30 s)	−18	−17	−7
NPCs (300 s)	−26	−39	−11
NPCs recycled	−11	−9.7	−3.2