Transparent rotated-disk electrode

Figure 5.39 Transparent rotated-disk electrode system for producing and electiochem-ically monitoring photochemical reaction products.

Diphenylanthracene (DPA) has also been an important substrate in pyridination reactions. Anodic reaction leads to a di-pyridinium ion [32]. Marcoux (1971) found from the use of working curves that although the pyridination data could be described by both ECE and disproportionation processes, the data fitted disproportionation better. In contrast, Blount (1973), with transparent electrodes, and Svanholm and Parker (1973), with rotating disk electrodes, find that pyridination of DPA is an ECE reaction, following the pattern of Sioda s (1968) hydroxylation reaction. Anodic oxidation of DPA in the presence of 2,5-, 2,6-, and 3,5-... 

Figure 5.39 depicts a rotated electrode system that reverses the roles of the light and the electrode from that of preceding assembly. Here an intense beam of light shines through the transparent disk to produce a photochemical reaction. The products of the photochemical reaction are swept past the disk electrode, where they may be monitored for their electroactivity. 40... 

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