以苯甲酸、乙酰水杨酸和罗丹明B为反应物,设计合成了3种苯甲酰氨基脲衍生物。应用裸眼识别、紫外-可见吸收光谱和荧光光谱研究了受体分子与阴离子(F^-、Cl^-、HSO^-₄、H₂PO^-₄、Ac^-、ClO^-₄)的相互作用。结果表明,在乙腈溶剂中,受体分子L₁和L₂对F^-表现出较高的选择性,F^-的加入使受体分子的吸光度增强。在乙醇溶剂中,F^-的加入使受体分子L₃的紫外吸收波长发生红移,并且在620nm处出现新的荧光值,表现了对F^-的选择性识别。随着F^-浓度的增加,受体L₃的吸光度和荧光值依次增加,呈现梯度变化。

Three benzoyl semicarbazide derivatives were designed and synthesized by using benzoic acid,acetylsalicylic acid and rhodamine B.The interaction of the acceptor molecules with anions (F^-,Cl^-,HSO^-₄,H₂PO^-₄,Ac^-,ClO^-₄) were studied using naked eye recognition,UV-Vis absorption spectra and fluorescence spectra.The results showed that in the acetonitrile solvent,the receptor molecules L₁ and L₂ showed higher selectivity for F^-,and the addition of F^- increased the absorbance of the receptor molecule.In the ethanol solvent,the UV absorption wavelength of the acceptor molecule L₃ red shifts after the addition of F^-and a new fluorescence value appeared at 620nm,which shown the selective recognition of F^-.With the increase of the concentration of F^-,the absorbance and fluorescence of receptor L₃ increased in turn,showing gradient changes.