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'Viologen Derivatives' in keywords Facet   section ZfN Section B  [X]
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1991 (1)
1988 (1)
1Author    R. Upert Bauer, Christian KönigsteinRequires cookie*
 Title    Sterische Effekte auf die Hydrierstabilität von l,r-Dialkyl-4,4-bipyridiniumsalzen (Viologenen) in wasserphotolytischen Systemen Steric Effects on the Hydrogen Stability of l,r-D ialkyl-4,4'-bipyridinium Salts (Viologens) in W ater Photolytic Systems  
 Abstract    The chemical stability o f l,l'-dialkyl-4,4'-bipyridinium com pounds (viologens) as electron relay agents in hydrogen producing water photolytic systems is o f great importance for practi­ cal applications. Three new l,r-dialkyl-4,4'-bipyridinium com pounds (1 = l,l'-dim 
  Reference    Z. Naturforsch. 46b, 1544—1548 (1991); eingegangen am 7. M ärz/27. M ai 1991 
  Published    1991 
  Keywords    Electron Relay Com pounds, Viologen Derivatives, Water Photolytic Systems, Hydrogen, Radicals 
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 TEI-XML for    default:Reihe_B/46/ZNB-1991-46b-1544.pdf 
 Identifier    ZNB-1991-46b-1544 
 Volume    46 
2Author    Rupert Bauer, Peter Nussbaumer, Michael Neumann-SpallartRequires cookie*
 Title    On the Synthesis and Electrochemical Properties of Some New Bipyridinium and Related Compounds  
 Abstract    The synthesis of some new bipyridinium salts is described. Their behavior upon reduction is studied by cyclovoltammetry, coulometry and spectroscopically. Halfwave potentials range from —0.28 V to —0.59 V and e values of the reduced viologens lie around 10 4 MT'cm -1 . In addition two relay compounds (4,4'-pyridine-2,4-diyl)-bis-(l-methylpyridinium methylsulfate), 4.4',4"-(pyridine-2,4,6-triyl)-tris-(l-methylpyridiniumchloride) that are not viologens are described. These substances also form a colored radical upon reduction, but with exceptional stability to-wards oxidation with dioxygen. From coulometric measurements it is inferred that three electrons are transferred in one step. Spectral changes observed in the course of the electrochemical reduction are explained by dimer formation. 
  Reference    Z. Naturforsch. 43b, 475—482 (1988); received February 13/October 22 1987 
  Published    1988 
  Keywords    Electron Transfer Relays, Viologen Derivatives, Bipyridinium Compounds, Stable Cation Radicals, Photoinduced Water Splitting 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-0475.pdf 
 Identifier    ZNB-1988-43b-0475 
 Volume    43