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Structural and anion binding aspects of the tiny octaazacryptand

✍ Scribed by Md.Alamgir Hossain; José M. Llinares; Nathaniel W. Alcock; Douglas Powell; Kristin Bowman-James

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
382 KB
Volume
2
Category
Article
ISSN
1472-7862

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✦ Synopsis

The pH sensitivity of the binding of anions with a small octaazacryptand, 1,4,7,10,13,16,21,24-octaazabicyclo[8.8.8]hexacosane (L), has been examined. NMR studies were performed comparing the binding of a variety of anions: fluoride, chloride, bromide, iodide and nitrate, with the hexatosylate salt of L at pD 2.0 and 4.0. Results indicate that significant complexation only occurs between L and fluoride at pD 4.0 and with chloride and fluoride at pD 2.5 and lower. No binding was observed at either pD with the other anions examined. Crystallographic findings obtained for the chloride ( 1

and mixed chloride/nitrate (3), [H 6 L(Cl)][NO 3 ] 5 . 1.5H 2 O . CH 3 OH, complexes of L were obtained. For 1 and 3, L is hexaprotonated and a chloride ion is inside the cavity. In the iodide salt, 2, a molecule of water is encapsulated and L is tetraprotonated.

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