New robust 2D cobalt (II) coordination polymer as an effective turn-on luminescent sensor to detect Tb3+ and pefloxacin.

• A new ternary Co(II) CP was synthesized and characterized. • The first dual-response fluorescence "turn-on" sensor to detect Tb3+ and PEF. • Compound 1 exhibited highly sensitive and selective for the sensing Tb3+ and PEF. • The possible mechanism of fluorescence enhancement was analyzed in detail. It is necessary to employ highly sensitive and rapid detection of antibiotics and heavy ions in the environment. A mixed-ligands ternary Co (II) coordination polymer containing new L ligands, {[Co(L)(mip)(H 2 O)]·2H 2 O} n (1), (L = 2,2′-bis-(2-pyridin-3-yl-vinyl)-3 H ,3′ H -[5,5]bibenzoimidazole, H 2 mip= 5-methylisophthalic acid) was synthesized under solvothermal condition. Compound 1 displays a sql 2D layer with the point symbol of {44.62}. Compound 1 owns excellent thermal and pH stability and can effectively sensitize the luminescence of Tb3+ ions through the "antenna effect". Compound 1 can serve as luminescent probe for detecting pefloxacin and Tb3+ with low detection limits. Especially Compound 1 is the first turn-on sensor for the detecting Tb3+ ions and pefloxacin via fluorescence enhancement. In addition, the sensing mechanism is discussed in detail. A noval ternary Co(II)-based coordination polymer was solvothermally synthesized and characterized, which can act as dual-functional luminescence turn-on sensor to detect Tb3+ and PEF in aqueous solution with high sensitivity, selectivity, and well anti-interference. The luminescence enhancement mechanism is supported by experiments and theoretical calculations. [Display omitted] [ABSTRACT FROM AUTHOR]