Journal of the Chemical Society, Dalton Transactions p. 2331 - 2336 (1982)
Update date:2022-08-04
Topics: Ligands Alkali metals
Handyside, Timothy M.
Lockhart, Joyce C.
McDonnell, Martin B.
Rao, P. V. Subba
Three homologous series of bis(crowns) have been produced by condensation of the appropriate formylbenzocrown with long-chain α, ω-diaminoalkanes.The ligands may be viewed as pocket or crevice sites for alkali-metal cations, lined with donor groups to provide ion-dipole interaction and terminated by a hydrophobic methylene chain.The interaction of these ligands with alkali-metal cations has been investigated by spectroscopic techniques and solvent extraction.Pocket complexes of these bis(crowns) with alkali-metal cations were apparently formed in 'best-fit' situations: thus bis(crown-5) compounds formed pocket complexes with cations larger than sodium, while bis(crown-6) ligands formed pocket complexes with cations larger than potassium.The bis(crown-4) ligands did not appear to complex strongly with any cation.The rates of trapping and release of alkali-metal cations from some of these ligands in methanol solution, investigated by temperature-jump techniques, indicate behaviour distinct from that of any of the crown and cryptand types described in the literature.
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