Abstract
A minimalist squaramide-based chemodosimeter for Cu(2+) is described. Upon selective chelation to 2, Cu(2+) induces the formation of a highly colored zwitterionic radical, which is kinetically stable for hours. The presence of a radical is confirmed by EPR and ESI-MS. It is then possible to use reagent 2 for visual and selective sensing of Cu(2+) at neutral pH.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Amides / chemistry*
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Chelating Agents / chemistry*
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Copper / analysis
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Copper / chemistry*
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Cyclobutanes / chemistry*
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Electron Spin Resonance Spectroscopy
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Free Radicals / chemistry
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Hydrogen-Ion Concentration
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Oxidation-Reduction
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Water / chemistry
Substances
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Amides
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Chelating Agents
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Cyclobutanes
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Free Radicals
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Water
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Copper
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squaric acid