Abstract
Hosts with thiourea groups bind anions by formation of multiple hydrogen bonds. This contribution discusses how spacers linking two or four thiourea groups affect the host affinity and selectivity. While most of the bis-thioureas bind H2PO4- preferentially, the extent of selectivity over chloride, acetate, and H2AsO4- is determined by the size of the binding cavity. A tetrakis-thiourea is shown to exhibit a unique H2AsO4- selectivity, and the discrimination of chloride is enhanced by specific solvation in dimethyl sulfoxide.
Original language | English (US) |
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Pages (from-to) | 2530-2536 |
Number of pages | 7 |
Journal | Tetrahedron |
Volume | 64 |
Issue number | 11 |
DOIs | |
State | Published - Mar 10 2008 |
Bibliographical note
Funding Information:This work was partially supported by the National Institute of Health (1R01 EB005225-01) and an NSF Research Experience for Undergraduates fellowship to A.N.L. Trevor Bieber and Mary Messner are gratefully acknowledged for their assistance with the preparation of host compounds.