Ultrasound-assisted synthesis of a chemosensor from benzoyl chloride and diethylenetriamine in acetonitrile was carried out and the product structure was confirmed by UV-VIS and FT-IR spectroscopy. The synthesized chemosensor interacts with metal ions and produces a notable change in colorimetric measurements. It is observed that as the concentration of metallic ions increases, absorbance also increases, thus the chemosensor can be used for quantitative estimation of metal-ion content.