Hemispherand-Strapped Calix[4]pyrrole: An Ion-pair Receptor for the Recognition and Extraction of Lithium Nitrite

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• 作者：Qing He ; Zhan Zhang ; James T. Brewster ; Vincent M. Lynch ; Sung Kuk Kim ; Jonathan L. Sessler
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：August 10, 2016
• 年：2016
• 卷：138
• 期：31
• 页码：9779-9782
• 全文大小：335K
• 年卷期：0
• ISSN：1520-5126

文摘

The hemispherand-strapped calix[4]pyrrole (1) acts as an ion pair receptor that exhibits selectivity for lithium salts. In organic media (CD<sub>2sub>Cl<sub>2sub> and CD<sub>3sub>OD, v/v, 9:1), receptor 1 binds LiCl with high preference relative to NaCl, KCl, and RbCl. DFT calculations provided support for the observed selectivity. Single crystal structures of five different lithium ion-pair complexes of 1 were obtained. In the case of LiCl, a single bridging water molecule between the lithium cation and chloride anion was observed, while tight contact ion pairs were observed in the case of the LiBr, LiI, LiNO<sub>3sub>, and LiNO<sub>2sub> salts. Receptor 1 proved effective as an extractant for LiNO<sub>2sub> under both model solid–liquid and liquid–liquid extraction conditions.