Fig. 3. Square-wave voltammograms of carboxylate derivatives 17 (orange), 18 (black) and 19 (light blue), iridium photocatalysts 1 (green) and 2 (dark blue), and the archetypal Michael acceptor 3a (red); sample concentration: 1 mM. Experiments were carried out in room-temperature acetonitrile solutions and recorded at a scan rate of 100 mV s–1 with a square-wave amplitude of ±20 mV and a frequency of 25 Hz.
