New oxacalix[4]arene carboxylate detects viologen in protic media

Autor:	Maria Fomitšenko, Tõnis Pehk, Mari-Liis Ludvig, Anna Peterson, Jasper Adamson, Merle Uudsemaa, Sandra Kaabel, Aleksander Trummal, Jevgenija Martõnova, Riina Aav, Paul Kerner
Rok vydání:	2019
Předmět:	chemistry.chemical_compound 010405 organic chemistry Chemistry medicine Viologen General Chemistry Carboxylate 010402 general chemistry 01 natural sciences Combinatorial chemistry 0104 chemical sciences medicine.drug
Zdroj:	Supramolecular Chemistry. 32:313-319
ISSN:	1029-0478 1061-0278
DOI:	10.1080/10610278.2019.1659269
Popis:	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 (Ka = 111 ± 3 M–1) and in methanol (Ka = 2020 ± 70 M–1).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e88036c5ba95ddab5cad2cbf74b4e5b7 https://doi.org/10.1080/10610278.2019.1659269 Zobrazit plný text záznamu