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|Title: ||Thiacalixarene derivatives bearing imidazole units: a ditopic hard/soft receptor for Na+ and K+/Ag+ with an allosteric effect and a reusable extractant for dichromate anions|
|Authors: ||Zhao, Jiang-Lin|
Elsegood, Mark R.J.
Warwick, Thomas G.
Teat, Simon J.
|Issue Date: ||2016|
|Publisher: ||© Wiley-VCH|
|Citation: ||ZHAO, J.-L. ... et al., 2016. Thiacalixarene derivatives bearing imidazole units: a ditopic hard/soft receptor for Na+ and K+/Ag+ with an allosteric effect and a reusable extractant for dichromate anions. Chemistry Select, 1 (8), pp.1541-1547.|
|Abstract: ||Two novel receptors 5,11,17,23-tetra-tert-butyl-25,27-bis[(ethoxycarbonyl)methoxy]-26,28-bis-[1-methyl-(imidazole)meth-oxy]-2,8,14,20-tetra-thiacalixarene (L1) and 5,11,17,23-tetra-tert-butyl-25,27-bis-[(benzyl)methoxy]-26,28-bis-[1-methyl-(imidazole)-methoxy]-2,8,14,20-tetrathiacalixarene (L2) possessing imidazole moieties based on thiacalixarene in the 1,3-alternate conformation have been synthesized and characterized. The crystal structures of L1 and L2 have been determined. The binding behaviour towards Li+, Na+, K+ and Ag+ ions has been examined by 1H NMR titration experiments in (CDCl3/CD3CN; 10:1, v/v) solution. The exclusive formation of mononuclear complexes of L1 with metal cations is of particular interest revealing a negative allosteric effect in the thiacalixarene family. Liquid-liquid extraction experiments indicate that synthesized L2 can be utilized as an efficient reusable extractant for dichromate anion by controlling the pH of the aqueous solution.|
|Description: ||Closed access until 07/06/2017.|
|Sponsor: ||We would like to thank the OTEC at SagaUniversity and the International Cooperation Projects of Guiz-hou P rovince (N o. 20137005) for financial support. The EPSRC isthanked for a travel grant (to CR).|
|Version: ||Accepted for publication|
|Publisher Link: ||http://dx.doi.org/10.1002/slct.201600245|
|Appears in Collections:||Closed Access (Chemistry)|
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