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Ligands for the Alkali Metals. Part 6. Some Bis(crown) Schiff Bases which form Pocket Complexes with Alkali-metal Cations of Appropriate Size

DOI: 10.1039/DT9820002331

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 2331 - 2336 (1982)

Update date:2022-08-04

Topics: Ligands   Alkali metals  

Authors:

Handyside, Timothy M.Handyside, Timothy M.

Lockhart, Joyce C.Lockhart, Joyce C.

McDonnell, Martin B.McDonnell, Martin B.

Rao, P. V. SubbaRao, P. V. Subba

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Article abstract of DOI:10.1039/DT9820002331

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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Product name:N,N'-Bis-[1-(6,7,9,10,12,13-hexahydro-5,8,11,14-tetraoxa-benzocyclododecen-2-yl)-meth-(E)-ylidene]-heptane-1,7-diamine

Cas No:84992-94-9

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