In this paper we describe the synthesis of a new viologen with zwitter-ionic character [(7,8-dihydro-6H-dipyrido[1,2,-a:2,1-c][1,4]diazepinium)-2,12-]di-4,4′-phenethylsulphonate, which belongs to the series of bridged 2,2′-bipyridinium compounds. Its E 1 2 value has been measured using cyclic voltammetry and it has been used in investigations of the sacrificial photo-reduction of water, either in a homogeneous phase or in the presence of colloidal SiO2 as a support. This viologen has proved to be four times more efficient than those previously employed to generate hydrogen at the basic pHs needed for the use of SiO2. © 1985.
Bourdelande, J. L., Camps, J., Font, J., De March, P., & Brillas, E. (1985). Synthesis of a new relay four photosensitized hydrogen production in basic aqueous SiO2 media. Journal of Photochemistry, 30(4), 437-444. https://doi.org/10.1016/0047-2670(85)85061-9