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.
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