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1993 (1)
1Author    Structure, M. Spectroscopy, H.-D Agnetism, WolfgangK. Hausena, Aim, Andreas Schulz3, MichaelM. Oscherosch3, Jeanne Jordanovb, C.E A, -CE N GrenobleRequires cookie*
 Title    Erstmaliger Nachweis von ;r-;r-Dimerenbildung bei stabilen 1,4-Dialkylchinoxalinium-Radikalkationen. Struktur, Spektroskopie und Magnetismus First Evidence for 7t-7r-Dimerization of the Stable 1,4-Dialkylquinoxalinium Radical Cations  
 Abstract    Crystal and molecular structure analysis o f 1,4-diethylquinoxalinium iodide shows a virtual­ ly planar quinoxaline ring with 11 conjugated 7r-electrons. In contrast to the triiodide o f the I,4,6,7-tetramethyl derivative or to the tetraphenylborate salt o f 1,4-diethylquinoxalinium cat­ ion radical the iodide exhibits 7r-7r-dimerized radical cations in the solid state with synplanar ethyl groups and a rather small intermolecular distance o f about 315 pm between the 7r-planes o f the primarily interacting 1,4-diazine rings. Solid state magnetic measurements between 2 and 300 K show considerably diminished magnetic m om ents due to partial spin-pairing, and UV/VIS spectroscopic measurements in acetonitrile reflect the 7r-7r-interaction in solution through the appearance o f a long-wavelength absorption band. 
  Reference    Z. Naturforsch. 48b, 1181—1186 (1993); eingegangen am 1. Juni 1993 
  Published    1993 
  Keywords    Heterocycles, Radical Cations, Structure, M agnetism, A ssociation Phenomena 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-1181.pdf 
 Identifier    ZNB-1993-48b-1181 
 Volume    48