Abstract
A novel simple C3v-symmetric, completely water soluble quinoline based guanidinium Schiff's base system have been reported for the selective detection of Cd2+ in physiological environment through a turn-on fluorescence response. The cadmium complex is found to be highly selective toward iodide by turning off the fluorescence through the sequestration of Cd2+ from L1-Cd by the precipitation of CdI2. Detection limit for Cd2+ and iodide are found to be 51ppb and 1ppb, respectively. L1 is reversible toward Cd2+ and iodide and can be recycled. The receptor was used for the detection of Cd2+ in complex natural samples (tap, lake and river water).
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