Synthesis of a crescent aromatic oligothioamide and its high selectivity in recognizing copper(II) ions

摘要

Functionalization of shape-persistent aromatic oligoamides still represents a diffcult task nowadays. A crescent aromatic oligothioamide was synthesized by simple thionation of the corresponding oligoamide with the Lawesson's reagent. The results from UV–vis spectra of the molecule upon metal ion complexation demonstrated its higher selectivity in recognizing Cu2+ions compared to the oligoamide precursor. The stoichiometry of the complex formed between the thioamide and Cu2+was found to be 1:1 with a binding constant of(4.3±0.9) 104mol/L.