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A selective fluorescence probe based on naphthalene for the detection of barium(II).
A designed naphthalene derivative (potassium 2,2'-(naphthalen-1-ylazanediyl)diacetate, ND) was synthesized successfully which characterized by spectroscopic techniques (NMR, IR and HRMS-ESI-TOF). The sensitivity and selectivity were high toward Ba2+ in aqueous solution (100.0 mM HEPES buffer, 100.0 mM KNO3 , pH 7.4) over a wide variation of metal ions such as Li+ , Na+ , K+ , Cs+ , Mg2+ , Ca2+ , Al3+ , Pb2+ , Fe2+ , Fe3+ , Co2+ , Ni2+ , Cu+ , Cu2+ , Ag+ , Zn2+ , Cd2+ and Ce3+ . The limit of detection (LOD) was found to be 9.56×10-8 M. Density functional theory (DFT) calculations at the B3LYP level employing the 6-31G(d,p) and LANL2DZ basis set were performed for optimization of ND and ND-Ba2+ complex. The calculated results were consistent with a favorable complexation corresponding to the proposed coordination.
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