Two Zn(II)-based coordination polymers as dual-responsive luminescent sensors for the detection of Cr2O72− ions, levofloxacin/sulfamethoxazole

Abstract

Two Zn(II) coordination polymers (CPs), [Zn(NBTA)(HL)] n ( 1 ) and {[Zn(4-NPA)(L)]·H 2 O} n ( 2 ) were hydrothermally synthesized. 1 and 2 can selectively detect Cr 2 O 7 2− /levofloxacin, and Cr 2 O 7 2− /sulfamethoxazole with high selectivity, low detection limits and excellent reusability, respectively, via the luminescence quenching process. • Two new coordination polymers were synthesized and characterized. • 1 and 2 exhibited highly sensitive and selective detecting abilities for Cr 2 O 7 2− ions. • 1 could treat as an efficient probe for the sensing of levofloxacin. • 2 could detect sulfamethoxazole with high sensitivity. Two new ternary coordination polymers (CPs), namely, [Zn(NBTA)(HL)] n ( 1 ) and {[Zn(4-NPA)(L)]·H 2 O} n ( 2 ) (H 3 NBTA = 5-nitro-1,2,3-benzenetricarboxylic acid, 4-H 2 NPA = 4-nitrophthalic acid, L = 1,4-bis(benzimidazol-2-yl)butane were hydrothermally synthesized and characterized. 1 possesses a 1D straight chain, which is further extended into a 2D supramolecular network through π–π stacking interactions. 2 exhibits the 2D hcb layer. The two CPs present highly thermal and chemical stabilities in the pH range from 3 to 12. 1 and 2 can selectively detect Cr 2 O 7 2− ions/levofloxacin, and Cr 2 O 7 2− ions/sulfamethoxazole, respectively, with recyclability and low detection limits.