Anion influence on extraction and transport of amino acid methyl esters by functionalised calix[4]arene

作者：Mutihac Lucia; Enache Ioana Varduca; Diacu Elena; Mutihac Radu Cristian; Vicens Jacques^*

来源：Supramolecular Chemistry, 2014, 26(7-8): 521-525.

DOI：10.1080/10610278.2013.863315

• functionalised calix[4]arene
• amino acids
• liquid-liquid extraction
• membrane transport

The liquid-liquid extraction of a series of amino acid methyl esters has been carried out with functionalised calix[4]arene (5,11,17,23-tetrakis(N-methylpiperazino)-25,26,27,28-tetrahydroxycalix[4]arene) from an aqueous phase into a chloroform phase as ion pairs in the presence of picrate ion or tropaeolin 00 as counter ion in order to study the molecular recognition properties of this receptor. The active transport assisted by pH gradient of amino acids as ion pairs through liquid membrane employing the functionalised calix[4]arene as carrier has been investigated. The results showed that the receptor exhibits good extractability towards amino acids and it can also act as carrier through liquid membrane aiming to the separation of amino acids. It was highlighted that the anion nature used as counter ion, the structure of calix[4]arene, and the structure of amino acids are responsible for the experimental results obtained. High yields in both amino acids extraction and transport were obtained for picrate ion used as counter ion.

• 出版日期2014-8