SCHOLZ, M and GESCHEIDT, G and SCHOBERL, U and DAUB, J (1995) FACTORS DETERMINING ION-PAIR FORMATION - STUDIES OF THE RADICAL-ANIONS OF 2,5-BIS(TRICYANOVINYL)FURAN AND 2,5-BIS(TRICYANOVINYL)THIOPHENE. JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2 (2). pp. 209-213. ISSN 0300-9580,
Full text not available from this repository.Abstract
The specificity of ion-pair formation of the radical anions of 2,5-bis(tricyanovinyl)furan (1) and 2,5-bis(tricyanovinyl)thiophene (2) has been studied using solvents covering a broad range on the polarity scale and Li+, Na+, K+ and Cs+ as the counter-ions. The EPR/ENDOR spectra show that 1.(-) and 2.(-) can exist as the free radical anions in which the tricyanovinyl groups have a syn/anti conformation, but under appropriate conditions 2.(-) can also exist in a syn/syn conformation in an ion-pair with the metal cation. This is rationalised in terms of a selectivity for the formation of ion pairs depending on the size of the alkali-metal cation and of the cavity presented by the proximate pair of cyano groups.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ELECTRON-PARAMAGNETIC RESONANCE; ETHERS; CHEMISTRY; ENDOR; EPR; |
| Depositing User: | Dr. Gernot Deinzer |
| Last Modified: | 19 Oct 2022 08:38 |
| URI: | https://pred.uni-regensburg.de/id/eprint/52766 |
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