Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 138, Issue 31, Pages 9779-9782Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.6b05713
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Funding
- Office of Basic Energy Sciences, U.S. Department of Energy (DOE) [DE-FG02-01ER15186]
- Basic Science Research Program of the National Research Foundation of Korea (NRF) by the Ministry of Science, ICT & Future Planning [2015R1C1A1A02037578]
- National Research Foundation of Korea [2015R1C1A1A02037578, 21A20151513130] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The hemispherand-strapped calix[4]pyrrole (1) acts as an ion pair receptor that exhibits selectivity for lithium salts. In organic media (CD2Cl2 and CD30D, 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, LiNO3, and LiNO2 salts. Receptor 1 proved effective as an extractant for LiNO2 under both model solid liquid and liquid liquid extraction conditions.
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