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The fluorescent and stable aqueous solution of 3-Cyano-4,6-dimethyl-2-pyridone (CDPy) has been used as a probe for selective detection of Hg+2 ions in natural river water. The fluorescence intensity of the probe was reduced on adding Hg+2 ions. The DFT and TD-DFT confirmed that the reduction in fluorescence intensity occurred due to excited state charge transfer between the CDPy molecule and Hg+2...
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