In the rather polar organic solvents dimethoxyethane, tetrahydrofuran and 3-methyltetrahydrofuran, the behaviour of contact ion pairs, solvent-separated ion pairs and free carbanions of polystyryl sodium has been investigated by kinetic and conductivity measurements• Both the equilibrium between the
Structure features of ions and ion pairs of nitroarene anionic σ-complexes in aprotic solvents
✍ Scribed by E.N Alifanova; K.K Kalninsh; A.Ja Kaminsky; Yu.M Atroshchenko; S.S Gitis; A.D Kutzenko; P.V Chudakov; E.Yu Tarasova
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 457 KB
- Volume
- 91
- Category
- Article
- ISSN
- 0167-7322
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✦ Synopsis
The structure of ions and ion pairs of Meisenheimer and Janovsky o-complexes of 1,3,5trinitrobenzene has been studied by derivative spectroscopy and semiempitical quantum chemical PM3 and CNDO/S methods. On the base of comparison of theoretical and experimental electronic absorption spectra the three types of co-ordination of anion and cation have been defined. It was established that the structure of ion pairs is determined by the nature of the subsituents of the pyramidal unit.
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Analysis of.internalvibrations of the ~JCO~ anion of the lithium trifluoroacekkdissolved in acetonitrile or dimethyl-.,' .' sulphoede shows 5yu-in' cty ofss&&tion~. In dimethylsulphoxide solutions, an e,quilibrium is .obxrve between frqc ions ,, and ion ptis; in aeeto$ile even at relat&ely low con