Microwave-Induced Synthesis of a New Benzodiazepinone Based Chemosensor in Chloroform Under Thermal Agitation: A Potential Fluorescent Sensor for Multi-Signaling Detection of Metal Ions

Publication date: Available online 11 February 2020Source: Inorganica Chimica ActaAuthor(s): Merangmenla, Amrit PuzariAbstractA new fluorescent sensor 5, 10-dihydro-11H-pyrido [3, 2-b][1], [5] benzodiazepin-11-one (L) has been synthesized and characterized using conventional spectroscopic techniques. The receptor showed large fluorescence quenching effect with transition metal ions like Ni2+, Co2+, Cu2+ and Fe3+ via internal charge transfer (ICT), and with a detection limit at ppm level. The quenching constant was determined using Stern-Volmer plot. UV-vis titrations of L with selected divalent and trivalent metal ions like Ni2+, Co2+, Cu2+, Pb2+, Cr3+, and Al3+ exhibits specific interaction with red shifts in absorption wavelength. The binding stoichiometry of L with divalent metal ions in the ratio of 4:1 was determined using the Job’s plot. The experimental result of UV-vis absorption of L was found to be in good agreement with the calculated data obtained by Density functional theory (DFT) method. As a representative example, the TD-DFT calculations were used to explain the sensing ability of L towards Cu2+ ion.Graphical abstract

Source: Inorganica Chimica Acta - February 12, 2020 Category: Chemistry Source Type: research