| | 1 | Author
| H. Bock, C. Arad, C. Näther, I. G. Öbel, A. John, R. Baur | Requires 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 | | | |
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