Two water-stable Cd(II)-based coordination compounds as a fluorescent sensor for selective and sensitive detection of antibiotics

Developing highly stable materials for harmful compound detection in a water environment is of much importance and challenge. we report two cadmium based fluorescent coordination compounds with formula [Cd(HL) (phen)(H2O)3] (1) and [Cd(HL)(2,2 '-bipy)(H2O)2] (2) where H3L = 4-(N,N'-bis(4-carbonylbenzyl)amino)-3methylbenzenesulfonic acid, phen = 1,10-phenanthroline monohydrate and 2, 2 '-bipy = 2, 2 '-bipyridine. Details structural studies showed that compounds 1 and 2 are mononuclear and binuclear discrete compounds, respectively. Its excellent luminescence stability in aqueous solutions, coupled with outstanding thermal and chemical stabilities, enables it to function as an efficient detector for metamitron (MMT). It boasts a limit of detection of 2.72 ppm and exhibits quenching constant (KSV) values of 0.09, making it an effective luminescent sensor for detecting MMT. The luminescence quenching of the compound 1 by MMT was attributed to competing absorption and photoelectron energy transfer mechanisms.