Applications of Oligomers having Pendant Coumarins in the Metal Ions Sensing
Date Issued
2004
Date
2004
Author(s)
Lin, Yu-Chen
DOI
zh-TW
Abstract
In our previous research, we found that fluorosensor 1 with coumarin as the signal-transducing unit and with azacrown as the recognition unit provides high selectivity to heavy-metal ions and displays high fluorescence intensity in organic solvents. According to these experiment results, we replace diethylamine at 7-position of coumarin with norbornene, a functional group provide double bond for ROMP. Copolymerization by ring-opening metathesis may direct a new route to tune optical properties of sensors through combinations of various monomers and through stoichiometry of monomers.
We tune the ratio of coumarin-functionalized monomer 4 to cycloalkene to produce a series of copolymers (22~26). Copolymers bearing pendant coumarins and hydrophobic backbone are highly selective for strontium ion and display high fluorescence change, a 125-fold enhancement in dichloromethane. We can also utilize color change to achieve metal-ions detection by naked eyes. Thus we find color change from pale yellow to pink in tetrahydrofuran when iron ion is added.
We use unsaturated crown ether 28 instead of cycloalkene to produce copolymers bearing hydrophilic backbone. Copolymer 29 having hydrophilic backbone is highly selective for sodium ion and displays high fluorescence intensity in dichloromethane. Our experimental results indicate that incorporated hydrophilic backbone in our copolymers not only improves the solubility in acetonitrile but also participates in metal-ion binding.
Subjects
香豆素
化學感測分子
Metal Ions Sensing
Coumarin
Type
thesis
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