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. Author manuscript; available in PMC: 2020 May 23.
Published in final edited form as: J Phys Chem C Nanomater Interfaces. 2019 Apr 19;123(20):12827–12840. doi: 10.1021/acs.jpcc.9b02041

Figure 9.

Figure 9.

(a) Reaction scheme of pairwise addition of p-H2 to propargyl 1-13C-pyruvate in D2O over water-soluble Rh catalyst followed by polarization transfer to 13C nuclei (HA and HB are two atoms from the same p-H2 molecule). (b) 1H NMR spectrum acquired after 1H ALTADENA hyperpolarization of allyl 1-13C-pyruvate with ~10 mM catalyst concentration and 30 s p-H2 bubbling duration at 80 psig and 85 °C. (c) Corresponding thermal 1H NMR spectrum acquired after relaxation of hyperpolarization (multiplied by a factor of 16). Acetone was used during sample preparation step.62 ε1H = 1090, P1H = 3.2% (6.0% at 85% p-H2 fraction) (calculated using signal 13c+15c). (d) 13C NMR spectrum acquired after 13C hyperpolarization of allyl 1-13C-pyruvate using MFC at 0.025 μT magnetic field with ~5.3 mM catalyst concentration and 20 s p-H2 bubbling duration at 70 psig and 80 °C. (e) Corresponding thermal 13C NMR spectrum acquired after relaxation of hyperpolarization. ε13C = 760, P13C = 0.55% (0.82% at 85% p-H2 fraction).