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Title: Thiacalix[4]arene 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
Wu, Chong
Zeng, Xi
Rahman, Shofiur
Georghiou, P.E.
Elsegood, Mark R.J.
Warwick, Thomas G.
Redshaw, Carl
Teat, Simon J.
Yamato, Takehiko
Keywords: Thiacalix[4]arene
Imidazole
Allosteric effect
Dichromate
Issue Date: 2016
Publisher: © Wiley-VCH
Citation: ZHAO, J.-L. ... et al., 2016. Thiacalix[4]arene 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-thiacalix[4]arene (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-tetrathiacalix[4]arene (L2) possessing imidazole moieties based on thiacalix[4]arene 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 thiacalix[4]arene 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
DOI: 10.1002/slct.201600245
URI: https://dspace.lboro.ac.uk/2134/21753
Publisher Link: http://dx.doi.org/10.1002/slct.201600245
ISSN: 2365-6549
Appears in Collections:Closed Access (Chemistry)

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