Abstract
Complexation of alkali cations by macroheterobicyclic ligands leads to a now well-known class of complexes, called cryptates, in which the cation is included within the central molecular cavity of the ligand [1]. Solutions of these alkali metal cryptates have been studied by different techniques [2], however, only few data exist concerning their physicochemical properties in low polarity aprotic solvents [3]. This information is needed in order to elucidate the mechanism and the kinetics of the anionic polymerization of heterocyclic and vinyl monomers with cryptates as counterions [4]. Thus we have examined the behavior and the structure of some lithium ion pairs and of their complexes with cryptands, namely the [211], in THF and in toluene by two complementary techniques : UV and visible spectrophotometry, and by 1H 7Li and NMR.
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© 1987 Elsevier Science Publishing Co., Inc.
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Hubert, S., Momtaz, C., Hemery, P., Boileau, S., Kintzinger, J.P. (1987). Spectroscopic Studies of some Cryptated Lithium Carbanions and Related Species. In: Hogen-Esch, T.E., Smid, J. (eds) Recent Advances in Anionic Polymerization. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3175-6_3
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DOI: https://doi.org/10.1007/978-94-009-3175-6_3
Publisher Name: Springer, Dordrecht
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