fig7
Figure 7. EPR in situ signals of (A) DMPO-·OH; (B) DMPO-·O2-; (C) TEMP-1O2, and (D) TEMPO-h+ species during photooxidation of HMF with Au/CN(I) and water, except methanol for (B). EPR: electron paramagnetic resonance; DMPO: 2,2,6,6-tetramethyl-4-piperidinol; TEMP: 2,2,6,6-tetramethylpiperidine; TEMPO: 2,2,6,6-tetramethyl-1-piperidinyloxy; HMF: 5-hydroxymethylfurfural; EPR: electron paramagnetic resonance.
