Visual sensing of aqueous anions by C2-symmetric chemosensor and its application in real sample analysis

A novel, highly symmetric and sensitive chemosensor 1 containing hydrazone site was prepared in a single step by simple and easy method. Chemosensor 1 exhibits anion detection properties of F−, AcO− and H2PO4− ions in 100% aqueous medium using various types of anion sources. Its colorimetric response was confirmed by color changes from orange to violet without counter cation interference and aqueous environment. Receptor 1 detected the selected anions at the level of 10−6 M with the association constant (Ka) of 105 range. The application of receptor 1 was demonstrated in the real samples like toothpaste and vinegar in complete aqueous environment.