Abstract
New receptor molecules have been synthesized in which α,α′-bis-(4-hydroxyphenyl)-1,4-diisopropylbenzene is linked to 1,10-diaza-18-crown-6, 1,10-diaza-21-crown-7 or 1,13-diaza-24-crown-8 units by ethylene or 1,4-butylene bridges. Binding abilities of the new receptors and the model compoundN,N-didecyl-1,10-diaza-18-crown-6 toward alkali metal cations and alkylammonium ions were assessed by picrate extraction. Spectral evidence for inclusion of alkylammonium ions within the receptor cavity was obtained by1H NMR spectroscopy. From a1H NMR titration experiment conducted in CDCL3−CD3OD (9∶1), a relatively strong inclusion complex (K a ∼ 900M−1) of the receptor having a 1,10-diaza-18-crown-6 subunit and ethylene spacers with propylammonium picrate was observed.
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Bartsch, R.A., Spruce, L.W., Purkiss, D.W. et al. New ditopic receptors for alkylammonium ion complexation. J Incl Phenom Macrocycl Chem 15, 181–193 (1993). https://doi.org/10.1007/BF00710227
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DOI: https://doi.org/10.1007/BF00710227