Recognition-guided sulfate extraction and transport using tripodal hexaurea receptors

Si Qi Chen, Shu Na Yu, Wei Zhao*, Lin Liang, Yunyan Gong, Lifei Yuan, Juan Tang, Xiao Juan Yang, Biao Wu*

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

14 引用 (Scopus)

摘要

The separation of sulfate anions (SO42−) from water is a great challenge due to its high hydration energy. Using synthetic receptors that are designed with a size-complementary cavity for sulfate binding, sulfate anions could be extracted from water to the organic phase via liquid-liquid extraction (LLE) method. To understand the correlation between sulfate binding (recognition chemistry) and sulfate-separation efficiency across two phases, herein we prepared a family of tripodal hexaurea receptors bearing various terminal substitutions: 4-nitrophenyl substituted L1, 4-methylphenyl substituted L2, and hexyl-chain-substituted L3. The crystal structures of [L2·SO4]2− and [L3·SO4]2− and 1H NMR titrations suggested that the sulfate-binding affinity of these receptors were terminal substitution-dependent, where the H-bonding strength and secondary C-H⋯π interactions were regulated. Comprehensive LLE studies indicated that all three receptors displayed highly efficient sulfate extraction with receptor-loading dependence and concentration independence. Relative sulfate-extraction efficiency was consistent with the sulfate-binding affinity of these receptors. Notably, using the hexyl-chain-substituted receptor L3, sulfate anions could be extracted and released by acidification for several cycles. Typical U-tube transport experiments demonstrated that over 70% of sulfate anions could be transported from the source phase to the receiving phase in 3 days across a bulk liquid membrane, which comprised the receptor L3. Our work shows a paradigm of how the sulfate-recognition property is correlated with sulfate separation via LLE, which may help to understand and promote the development of supramolecular recognition-based systems for achieving desired separations.

源语言英语
页(从-至)6091-6101
页数11
期刊Inorganic Chemistry Frontiers
9
23
DOI
出版状态已出版 - 11 10月 2022

指纹

探究 'Recognition-guided sulfate extraction and transport using tripodal hexaurea receptors' 的科研主题。它们共同构成独一无二的指纹。

引用此

Chen, S. Q., Yu, S. N., Zhao, W., Liang, L., Gong, Y., Yuan, L., Tang, J., Yang, X. J., & Wu, B. (2022). Recognition-guided sulfate extraction and transport using tripodal hexaurea receptors. Inorganic Chemistry Frontiers, 9(23), 6091-6101. https://doi.org/10.1039/d2qi01991d