Ion Pair Properties of Lithium and Cesium Salts of Carbazole1
The lithium salt of carbazole, LiCb, is monomeric in THF in the concentration range (1−5) × 10-3 M. It is a contact ion pair (CIP) with an effective ion pair pK of 13.48 on a scale where fluorenyllithium solvent separated ion pairs (SSIP) are 22.90 (per hydrogen). The cesium salt, CsCb, is a mixture...
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| Veröffentlicht in: | Journal of the American Chemical Society 1998-03, Vol.120 (8), p.1718-1723 |
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| Hauptverfasser: | , , , |
| Format: | Artikel |
| Sprache: | eng |
| Online-Zugang: | Volltext |
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| Zusammenfassung: | The lithium salt of carbazole, LiCb, is monomeric in THF in the concentration range (1−5) × 10-3 M. It is a contact ion pair (CIP) with an effective ion pair pK of 13.48 on a scale where fluorenyllithium solvent separated ion pairs (SSIP) are 22.90 (per hydrogen). The cesium salt, CsCb, is a mixture of monomer and dimer with K 2 = 300 M-1. The monomer forms a 1:1 complex, CsCb·CbH, with K c = 62 M-1. The ion pair pK of monomeric CsCb is 19.24. |
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| ISSN: | 0002-7863 1520-5126 |
| DOI: | 10.1021/ja972839t |