Application of europium fluorescent probe based on terephthalic acid in aniline detection
A technology of terephthalic acid and terephthalate, applied in the application field of detecting aniline, can solve the problems of high cost, slow reaction, complicated operation, etc., and achieve high selectivity, good recyclability, and high sensitivity Effect
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[0018] 0.5492g (1.5mmol) EuCl 3 ·6H 2 O, 0.0828g (0.5mmol) terephthalic acid and 0.8006g (3.5mmol) iodide 1-ethyl-3-methylimidazolium ionic liquid are added in the reactor of 25mL polytetrafluoroethylene liner, mix well, then Place the reaction kettle in an oven, react at 170°C for 5 days, cool to room temperature, and wash with acetone and ethanol to obtain a colorless and transparent block-shaped europium fluorescent probe based on terephthalic acid, whose structural unit is [Eu (BDC)Cl(H 2 O)], where BDC represents a terephthalate group that loses protons on two carboxyl groups, belongs to the monoclinic crystal system, and the space group is P 2 1 / c, the unit cell parameter is α=γ=90°, β=103.352(4)°, unit cell volume Z=4. like figure 1 As shown, Eu1 adopts a seven-coordinated coordination mode, surrounded by four single-atom chelated carboxyl groups, two μ 2 -Cl - and a water to form a single-capped triangular prism.
[0019] 1. Fluorescence performance test...
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