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231223s2006 xx ||||| 00| ||eng c |
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|a (NLM)17129053
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|a DE-627
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|e rakwb
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|a eng
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|a Zhang, Sheng
|e verfasserin
|4 aut
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|a Selective anion sensing based on tetra-amide calix[6]arene derivatives in solution and immobilized on gold surfaces via self-assembled monolayers
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|c 2006
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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|b nc
|2 rdacarrier
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|a Date Completed 19.01.2007
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|a Date Revised 28.11.2006
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a Two anion receptors, 1 and 2, based on the calix[6]crown-4 architecture were synthesized and characterized by NMR (1H, 13C, COSY), UV-vis, and MALDI-MS. 1H NMR measurements demonstrate that receptors 1 and 2 exhibit the highest binding affinity for fluoride ions compared to other anions including Cl-, Br-, NO3-, HSO4-, H2PO4-, and AcO-. The binding constants of 1 with F- and AcO- are 326 (+/-32) and 238 (+/-23) M-1, whereas those of 2 with F- and AcO- are 222 (+/-25) and 176 (+/-21) M-1. The fluorescent titration of 2 with various anions such as Cl-, Br-, NO3-, HSO4-, and H2PO4- led to essentially no change in excimer emission and a slight enhancement of monomer emission. In contrast, a dramatic change was observed in the fluorescence spectra upon the addition of F- and AcO- to 2. Self-assembled monolayers (SAMs) of 1 were formed on gold surfaces and characterized by reductive desorption and other techniques. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy were used to monitor anion recognition by the SAM-modified gold electrodes. The gold electrodes modified by SAMs of 1, upon binding with the F- anion, exhibit a dramatic increase in charge-transfer resistance (Rct) values. This is due to the repulsion between the negatively charged electrode surfaces and the negatively charged Fe(CN)6(3-/4-) redox probe in the electrolyte solution. In contrast, smaller increases in Rct values were observed in the cases of other monovalent anions investigated
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|a Journal Article
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|a Palkar, Amit
|e verfasserin
|4 aut
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|a Echegoyen, Luis
|e verfasserin
|4 aut
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 22(2006), 25 vom: 05. Dez., Seite 10732-8
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|x 1520-5827
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|g volume:22
|g year:2006
|g number:25
|g day:05
|g month:12
|g pages:10732-8
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