A coumarin-based "Turn-on" fluorescence chemosensor 1 containing L-histidine for Al 3+ was readily synthesized and investigated, which showed high selectivity and remarkable sensitivity for aluminium(III) ions based on photo-induced electron-transfer (PET) mechanism in aqueous solution (Tris-HCl, 0.1 mM, pH 7.2). The sensor responded rapidly to Al 3+ in aqueous solutions with a 1:1 stoichiometry. Meanwhile, it indicated excellent adaptability and also the responsiveness.
The structure and electronic properties of polyhedral oligomeric silsesquioxane (POSS) cages functionalized with mono-substituted and multi-substituted vinyl and mercaptopropyl have been studied using density functional theory calculations. Electron density distributions and frontier molecular orbitals (FMOs) have been constructed at the B3LYP/6-31+G(d) level to understand the electronic properties. 1 H, 13 C, and 29 Si NMR spectra by using the gauge including atomic orbital (GIAO) method of the studied compounds were compared with experimental data obtained.
First, 7-hydroxy-4-methylcoumarin (5.00 g, 0.0284 mol) and hexamine (10.0 g, 0.071 mol) in acetic acid (37 mL) were stirred for 5.5 h at 95 C. Then, hydrochloric acid (75 mL, HCl: H2O = 84:100, v/v) was added and further
College of Chemistry and Chemical Engineering, Southeast University, Nanjing, Jiangsu 211189, P. R. ChinaA novel chemosensor L based on coumarin Schiff-base was synthesized and investigated. Sensor L showed remarkable selectivity for Al 3+ in Tris-HCl aqueous buffer solution (pH 7.2), and the selectivity was not affected by the presence of a large excess of other competitive ions. The sensor responded rapidly to Al 3+ in aqueous solutions with a 2:1 stoichiometry. Meanwhile, it indicated significant improvement of quantum efficiency and ideal fluorescent lifetime.
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