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以β-萘酚为原料,经过多步反应合成了5种不同电子效应的1-(5,6-苯并香豆素-3-甲酰基)-4-芳基氨基硫脲衍生物,并通过1H NMR,13C NMR,IR及元素分析等测试手段对受体分子进行表征.利用紫外-可见吸收光谱和荧光光谱考察了这类受体分子与F-,Ac O-,C1-,Br-,I-,HSO4-等阴离子的作用,发现受体分子对其它阴离子无响应;而对F-和Ac O-离子具有良好的选择性检,检测限分别为5.45与7.00μg/L,响应时间分别为5与10 min.实验结果表明该类受体分子与阴离子通过氢键形成配位物,从而导致光谱信号的变化.通过主客体间结合比和稳定常数的计算,证实了受体分子对F-和Ac O-选择性好,形成稳定化合物.Job’s曲线可知受体分子与阴离子形成1∶2的配合物,并利用核磁滴定与理论计算[B3LYP/6-31G(d,p)]进一步证实了受体分子与阴离子的氢键作用.
Five kinds of 1- (5,6-benzocoumarin-3-formyl) -4-arylthiosemicarbazone derivatives with different electronic effects were synthesized by multi-step reaction using β-naphthol as raw material, The acceptor molecules were characterized by 1H NMR, 13C NMR, IR and elemental analysis. The UV-Vis absorption and fluorescence spectra were used to investigate the interaction of these acceptor molecules with F-, Ac O-, Cl-, Br- , I-, HSO4- and other anions and found that the receptor molecule did not respond to other anions; while the F- and Ac O- ions have good selectivity test, the detection limits were 5.45 and 7.00μg / L, the response time Respectively 5 and 10 min.The experimental results show that the acceptor molecules and anions through the hydrogen bond to form a ligand, resulting in changes in the spectral signal by the host-guest binding ratio and the stability of the constant calculation, confirmed the receptor molecule pairs The selectivity of F- and AcO- are stable and form a stable compound. The Job’s curve shows that the acceptor molecule forms an anion with a 1: 2 ratio and is further verified by NMR (B3LYP / 6-31G (d, p) Confirmed the hydrogen bond between the acceptor molecule and the anion.