Photosensitized reductions of anthraquinone sulphonates in SiO2 colloids are mediated by propyl viologen sulphonate (PVS°)(1) as a primary electron acceptor; reduction yields are affected by electrostatic repulsions of the reduced acceptors from the negatively charged colloid.
I. Willner and Y. Degani, J. Chem. Soc., Chem. Commun., 1982, 761 DOI: 10.1039/C39820000761
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