Journal
SUPRAMOLECULAR CHEMISTRY
Volume 32, Issue 5, Pages 313-319Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/10610278.2019.1659269
Keywords
Oxacalix[4]arene carboxylate; herbicide sensing; 1; 3-alternate conformation
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Funding
- Estonian Research Council [PRG399, IUT23-7, IUT23-9, MOBJD39]
- European Regional Development Fund project [CoE TK134]
- ASTRA 'TUT Institutional Development Programme for 2016-2022' Graduate School of Functional materials and technologies [2014-2020.4.01.16-0032]
- European Regional Development Fund project CoE [2014-2020.4.01.15-0013]
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We demonstrate that Ullman fragment-coupling can be used to synthesise an oxacalix[4]arene monocarboxylic acid, which provides easy access to its water-soluble carboxylato derivatives. Crystallographic and computational data suggest that the new carboxyl-substituted oxacalix[4]arene adopts a 1,3-alternate conformation both in the solid-state and in methanol solution. Its water-soluble tetrabutylammonium derivate can detect the herbicide paraquat at neutral pH in aqueous media (K-a = 111 +/- 3 M-1) and in methanol (K-a = 2020 +/- 70 M-1).
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