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A novel coumarin derivative-grafted dialdehyde cellulose-based fluorescent sensor for selective and sensitive
Xiaoyuan Wang1, Zhiyuan Meng1, Xuechun Tian1
1Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, College of Light Industry and Food, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China.
Abstract:
A new fluorescent probe DAC-NCH with specific response to Fe3+ was synthesized via condensation reaction between dialdehyde cellulose and coumarin derivative. This probe exhibited a significant "turn-off" fluorescence response to Fe3+, accompanied by the fluorescence color change from bright pink to colorless. DAC-NCH was highly selective for Fe3+ and could achieve detection within a short time (<3 min). The detection limit of DAC-NCH for Fe3+ was determined to be as low as 91.7 nM. The complexation mechanism of DAC-NCH with Fe3+ was confirmed by Job's plot, FTIR analysis, 1H NMR titration, and density functional theory (DFT) calculations. In addition, DAC-NCH could be used for the determination of Fe3+ in actual water samples, and DAC-NCH-embedded fluorescent membrane was able to serve as a reliable platform for the detection of Fe3+.
