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Improved Hydrogen Production with Tetramethyl‐and Hexamethylviologen as Electron‐Transfer Agents in the System H 2 O‐Ru(bpy) 2+ 3 ‐edta‐Pt
Author(s) -
Launikonis Anton,
Loder John W.,
Mau Albert W.H.,
Sasse Wolfgang H. F.,
Wells Darrell
Publication year - 1982
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.198200030
Subject(s) - chemistry , viologen , platinum , hydrogen , electron transfer , catalysis , hydrogen production , turnover number , photochemistry , radical , glutathione , inorganic chemistry , medicinal chemistry , organic chemistry , enzyme
The 1,1′,2,2′‐tetramethyl‐4,4′‐bipyridinium and the 1,1′,2,2′,6,6′‐hexamethyl‐4,4′‐bipyridinium dications have been compared with methylviologen as electron‐transfer agents in the photoreduction of water by the title system at pH 5.0 and 7.0. Rates of formation and yields of hydrogen, turnover numbers of viologens, and rates of decay of viologen radicals have been measured at different concentrations of platinum and in the presence of glutathione. The results suggest that improved performance by tetramethyl‐ and hexamethylviologen in the production of hydrogen is related to higher rates in the hydrogen‐producing step and to increased stability towards platinum‐induced side reactions, such as catalytic hydrogenation. These side reactions can be largely suppressed by addition of glutathione to give improved yields and rates of formation of hydrogen and increased turnover numbers for the viologens.