Photochemical decomposition, regenerated

Moilanen et al. (1978) observed that it was stable to irradiation when it was in a nitrogen carrier gas, indicating that molecular oxygen is involved in the photochemical decomposition they suggest that 02 may add to a biradical formed from the chloropicrin upon light absorption but that 02 is regenerated in the decomposition of the adduct. 

Figure 10. Data on the heterogeneous acid hydrolysis, enzymatic hydrolysis, and photochemical decomposition of regenerated cellulose. (Reproduced with permission from Ref. 16. Copyright 1966 TAPPI.)...

Photoreleasable esters. A method for carboxyl group protection is based on esters obtained by O-alkylation of acids with the phenacyl chloride. The photochemical decomposition that regenerates the acids does not require a photosensitizer. 

Figure 9.51 Schematics of (a) photochemical cell, where two different molecules undergo redox reaction, which leads to the photoassisted decomposition of molecules (b) PEC solar cell, where same redox gets reduced and oxidized reversibly at photoelectrode and counter electrode, and thns net conversion of light into the electricity (c) dye-sensitized PEC solar cell. The light is absorbed by dye molecule (D) and in an excited state, it injects the electron to CB. Electron travels through external circuit and reduces the mediator molecule, for example, Ij into Ij. Ij reduces D and the dye is regenerated for next electron transfer.

---