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Strongly fluorescent polymers (FPs) were prepared from citric acid and ethylenediamine via a hydrothermal approach. The FPs display low toxicity, water solubility, a quantum yield of 91%, good photostability and stability in the physiological pH range. Ferric ions are found to quench the fluorescence which is best measured at excitation/emission wavelengths of 350/440 nm. Because ferric ions (Fe3+...
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