Go toArchive
Browse byFacets
Bookbag ( 0 )
'Tetraphenylbutatriene Radical Anion and Dianion Salts' in keywords
Results  1 Item
Sorted by   
Publication Year
1996 (1)
1Author    H. Bock, C. Arad, C. Näther, I. G. Öbel, A. John, R. BaurRequires cookie*
 Title    Elektronentransfer und Kontaktionen-Bildung, 45 [1, 2] Strukturänderungen bei der Einelektronen-Reduktion von Tetraphenyl- butatrien zum Radikalanion und bei der Zweifach-Deprotonierung von Tetraphenyl-butin-2 zum Tetraphenylbutatrien-Dianion Electron Transfer and Contact Ion Pair Form ation, 45 [1 ,2 ] Structural Changes on Single Electron R eduction of Tetraphenylbutatriene to its Radical A nion and on Twofold D eprotonation of Tetraphenylbutyne-2 to the Tetraphenylbutatriene D ianion  
 Abstract    Tetraphenylbutatriene is reduced under aprotic conditions to its ESR/ENDOR-spectro-scopically characterized radical anion and to its dianion, with both electron transfers quasi-reversible according to cyclovoltammetric measurements. The alkali cation salts, the red con­ tact ion pair [(H ^C ^C j K N a^H iC O C H iC H iO C H ^d and the dark violet contact ion triple [(H3C6)4C4" ' KLi^H ^CO CH iCIU O CH O ?^ can be prepared by single electron reduction at a sodium metal mirror or by twofold de-protonation of l,l,4,4-tetraphenylbutyne-2 using lithium-/;-butyl. Their single crystal structures as well as that of the parent acetylene have been determined at low temperatures. The essential structural changes observed are the twisting of both molecular halves (H5C6)2CC relative to each other with increasing negative charge. The simultaneously resulting bond alternancy >C = C = C = C< — >Ce -C = C -C < within the cumulene chain is discussed based on MNDO calculations for the structures determined. Ausgangspunkt: Die Strukturen von K um ulenen 
  Reference    Z. Naturforsch. 51b, 1381—1390 (1996); eingegangen am 15. November 1995 
  Published    1996 
  Keywords    Tetraphenylbutatriene Radical Anion and Dianion Salts, Cyclovoltammetry, ESR/ENDOR Spectra, Single Crystal Structures 
  Similar Items    Find
 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1381.pdf 
 Identifier    ZNB-1996-51b-1381 
 Volume    51