Highly Selective Coextraction of H+/SO42- Using a Strapped Calix[4]pyrrole

Ying-Chun He; Hong-Bo Tong; Cheng-Gang Xu; Zhen-Xing Ren; Yong-Zhao Wang; Yan-Mei Yan; Meng-Liang Wang

doi:10.1021/acs.orglett.3c00422

Highly Selective Coextraction of H⁺/SO₄^2- Using a Strapped Calix[4]pyrrole

Org Lett. 2023 Mar 17;25(10):1737-1741. doi: 10.1021/acs.orglett.3c00422. Epub 2023 Mar 6.

Authors

Ying-Chun He¹, Hong-Bo Tong¹, Cheng-Gang Xu¹, Zhen-Xing Ren¹, Yong-Zhao Wang², Yan-Mei Yan³, Meng-Liang Wang¹

Affiliations

¹ Institute of Applied Chemistry, Shanxi University, Taiyuan 030006, P. R. China.
² Engineering Research Center of Ministry of Education for Fine Chemicals, Shanxi University, Taiyuan 030006, P. R. China.
³ College of Chemistry and Materials, Taiyuan Normal University, Jinzhong 030619, P. R. China.

PMID: 36877585
DOI: 10.1021/acs.orglett.3c00422

Abstract

We report on the synthesis of a cage-type calix[4]pyrrole (1) bearing an additional basic pyridinebisthiazolamine group on the strap. The receptor in its protonated form shows strong affinity and selectivity for sulfate over a wide range of inorganic anions. With receptor 1 as a liquid-liquid extractant, H⁺/SO₄^2- in the form of H₂SO₄ is almost quantitatively extracted from an aqueous solution containing HNO₃ at a high concentration to CH₂Cl₂ in a recyclable manner.