Synthesis of Novel N,N′,N″-Tris[aryl(hetaryl)-methylideneamino]guanidine Derivatives as Efficient and Selective Colorimetric Sensors for Fluoride Ion

Abstract

A series of N,N′,N″-tris[aryl(hetaryl)methylideneamino]guanidines have been synthesized in good yields by condensation of N,N′,N″-triaminoguanidine hydrochloride with aromatic and heteroaromatic aldehydes. All compounds have been characterized by ¹H and ¹³C NMR and FT-IR spectra, and the molecular structure of one compound has been determined by single crystal X-ray diffraction. Study of the optical properties of the title compounds in the presence of fluoride ions has shown selective color change from colorless to yellow and purple due to red shift in their UV-Vis absorption spectra.