
TY  - JOUR
A1  - Launikonis, A 
A1  - Loder, JW 
A1  - Mau, AWH 
A1  - Sasse, WHF 
A1  - Summers, LA 
A1  - Wells, D 
T1  - Solar reduction of water. III. Improved electron-transfer agents for the system water-Tris(2,2'-bipyridine)ruthenium dication-ethylenediaminetetraacetic acid-platinum
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1982
VL  - 35
IS  - 7
SP  - 1341
EP  - 1355
KW  - 
UR  - https://doi.org/10.1071/CH9821341 
N2  - In searching for more effective electron-transfer agents for the photochemical production of hydrogen by the title system 16 diquaternary pyridinium compounds have been evaluated. At pH values of 5.0 and 7.0 the best results are obtained with compounds with potentials near -0.5 and -0.6 V, respectively, provided they are stable. Kinetic measurements show that the rate of quenching of *Ru(bpy)32+ decreases and the rate of the catalysed reduction of Haq+ increases as the potential becomes more negative, so that a range of optimum potential is created. The pH dependence of hydrogen formation arises from the effects of pH on the rate of reduction of Haq+. The main loss of diquaternary pyridinium compounds during irradiation is caused by catalytic hydrogenation. Therefore compounds that are more resistant to hydrogenation than methylviologen are more effective in the production of hydrogen, provided their potentials fall within the required range. 
ER  -

