Fig. 6. (a) CVs of 0.75 mM 1 with the addition of H₂O₂ using the GC electrode at a 100 mV s^–1 scan rate. (b) DPV curves of 0.50 mM 1 with or without 1.0 mM H₂O₂. Conditions: 0.10 M phosphate buffer and 20 °C. (c) RRDE analysis of 0.5 mM 1 in 0.10 M pH 7.0 phosphate buffer. (d) RRDE analysis of 0.50 mM 1 in 0.10 M pH 3.0 phosphate buffer. The potential of the ring electrode is maintained at 0.70 V. Rotation rate is 1000 rpm, and scan rate is 10 mV s^–1.