Fig. 6. (A) UPS spectra of ATT-Cu and TT-Cu; (B) positive relationship between d-band center and K_m of ATT-Cu and TT-Cu; (C) UV-vis spectra of TCNQ solutions in the presence of ATT-Cu and TT-Cu; (D) trapping other reactive oxygen species (˙OH and ¹O₂) during the biomimetic oxidation of 3,5-DTBC over ATT-Cu; 2,2,6,6-tetramethylpiperidine (TEMP) and 5,5-dimethyl-1-pyrroline N-oxide (DMPO) were used to trap ¹O₂ and ˙OH, respectively; note: the ˙OH signal was inconspicuous, and the DMPO–H adduct and TEMPO were found; (E) proposed catalytic mechanism of ATT-Cu.