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Hemispherand-Strapped Calix[4]pyrrole: An Ion-pair Receptor for the Recognition and Extraction of Lithium Nitrite
- Authors
- He, Qing; Zhang, Zhan; Brewster, James T.; Lynch, Vincent M.; Kim, Sung Kuk; Sessler, Jonathan L.
- Issue Date
- 10-Aug-2016
- Publisher
- AMER CHEMICAL SOC
- Citation
- JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.138, no.31, pp 9779 - 9782
- Pages
- 4
- Indexed
- SCI
SCIE
SCOPUS
- Journal Title
- JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
- Volume
- 138
- Number
- 31
- Start Page
- 9779
- End Page
- 9782
- ISSN
- 0002-7863
1520-5126
- Abstract
- 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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