Hg2+-selective fluoroionophore of p-tert-butylcalix[4]arene-diaza-crown ether having pyrenylacetamide subunits
- Authors
- Kim, Ju Hee; Hwang, Ah-Ran; Chang, Suk-Kyu
- Issue Date
- Oct-2004
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- calix-aza-crown ether; fluoroionophore; pyrene; Hg2+ selectivity; ON-OFF type switching
- Citation
- TETRAHEDRON LETTERS, v.45, no.41, pp 7557 - 7561
- Pages
- 5
- Journal Title
- TETRAHEDRON LETTERS
- Volume
- 45
- Number
- 41
- Start Page
- 7557
- End Page
- 7561
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/24752
- DOI
- 10.1016/j.tetlet.2004.08.125
- ISSN
- 0040-4039
- Abstract
- A new ionophore having two pyrenylacetamide moieties based on the p-tert-butylcalix[4]arene-diaza-crown ether has been prepared and its fluoroionophoric properties were investigated. Bis(pyrenyl) derivative was found to exhibit selective ON-OFF type sensing behaviour toward Hg2+ ions over other representative transition and heavy metal ions. The fluorescence quenching efficiency of larger than 20-fold was observed with 100equiv of Hg2+ ions and the association constant was found to be 4.5 x 10(4) M-1 in methanol. The ionophore also exhibited a very efficient quenching of excimer fluorescence selectively upon treatment with Hg2+ ions in 50% aqueous methanol solution. The observed Hg2+ -selective ON-OFF type fluorescence behaviour could be utilized as efficient sensing and switching devices for the design of other supramolecular systems. (C) 2004 Elsevier Ltd. All rights reserved.
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