A study on anion recognition by a naphthyl-thiourea derivative

A piperazine N, N' - bis naphthyl thiourea derivative was designed and synt hesized. The interactions of this compound with different dicarboxylate ani on were characterized by UV - vis and H-1 NMR spectroscopy. Results indicat ed that the complex formation through the hydrogen bond interactions betwee n anion and the title compound induced variation of absorption spectrum. Th e stability constants were determined in this work. It was found that the s electivity of dicarboxylate is dependent strongly on the chain length of an ion. The complex model is also proposed according to the results obtained.