The present study is a continuation of our work on the complexing properties of supramolecular architectures based on calixarenes and crown ethers. This work discloses the complexing and extraction abilities of calixarene derivatives depending upon the size of the intramolecular cavity formed by different numbers of identical crown ether substituents. The extraction and complexing properties of a series of p-tert-butylcalixarene derivatives containing N-methoxycarbonylmonoaza-12-crown-4 as substituents were evaluated through liquid-liquid extraction and spectrophotometric titration methods. It has been demonstrated that monosubstituted calixarene is an effective and highly selective extractant towards sodium cations. Calixarene´s derivative comprising two crown ether substituents tend to interact with alkali metal cations with formation of 1:1 complexes. On the contrary, cesium cation forms with the disubstituted calixarene a biligand mononuclear complex. The tetrasubstituted analog is an effective but not selective extractant for both s-element cations and cadmium and iron cations in the d-element series. Both tri- and tetrasubstituted calixarenes form mononuclear complexes with sodium cations in the alkali metal series and calcium ions in the alkaline earth metal series with lgK>5. At the same time, these macrocycles form the complexes of 1:1 and 1:2 compositions (ligand-cation) with barium and strontium cations. The ability of calixarene with four crown ether substituents to form binuclear complexes with cations of transition metals - copper, nickel, cobalt and cadmium - has also been demonstrated.
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Extraction and complexing abilities of a series of p-tert-butylcalixarenes substituted by N-carbonylmonoaza-12-crown-4
Published: 15 November 2023 by MDPI in The 27th International Electronic Conference on Synthetic Organic Chemistry session Polymer and Supramolecular Chemistry
https://doi.org/10.3390/ecsoc-27-16114 (registering DOI)
Keywords: Calixarenes; crown ethers; supramolecular architecture, complexing abilities, extraction