Coumarin derivatives are excellent chromogenic and fluorogenic dyes that are widely utilized as reporters in chemosensors [11]. It is known that by introduction of an electron-withdrawing group in the 3-position and electron-donating group in the 7-position, due to the effective intramolecular charge transfer (ICT) induced by the electron push–pull system, the resulting coumarin derivatives show absorption within the visible region as a result of ICT effect and have been used as colorimetric sensor for detecting metal ions