Two robust Zn( ii )-organic frameworks as dual-functional fluorescent probes for efficient sensing of enrofloxacin and MnO 4 − anions

• Published in: CrystEngComm 2021-12, Vol.24 (1), p.182-191
• Main Authors: Su, Yu-Qiao, Wang, Ruo-Tong, Blatova, Olga A., Shi, Yong-Sheng, Cui, Guang-Hua
• Format: Article
• Language: English
• ISSN: 1466-8033; 1466-8033
• DOI: 10.1039/D1CE01447A

Selective detection of antibiotics and MnO 4 − is crucial for human health improvement and protecting the environment. Two stable Zn( ii )-based metal–organic frameworks (MOFs) {[Zn 6 (L1) 2 (NDC) 5 ( μ 2 -OH) 2 ]·0.5H 2 O} n (1), and {[Zn(L2)(NDC)]·2H 2 O} n (2) (H 2 NDC = 1,4-naphthalenedicarboxylic acid, L1 = 1,5-bis(1-(pyridine-4-ylmethyl)-1 H -benzo[ d ]imidazol-2-yl)pentane, L2 = 1,6-bis(1-(pyridine-4-ylmethyl)-1 H -benzo[ d ]imidazol-2-yl)hexane) were successfully synthesized by adopting the mixed ligands approach. 1 is a rare 3D 3 , 5 , 6T23 framework based polynuclear complex group. 2 possesses a 2D sql layer. The two MOFs exhibit excellent chemical and thermal stability. The title compounds are promising dual-functional fluorescent sensors for detecting enrofloxacin/MnO 4 − anions with high selectivity and sensitivity ( K sv values toward enrofloxacin: 4.29 × 10 6 L mol −1 for 1 and 4.59 × 10 6 L mol −1 for 2 and toward MnO 4 − : 1.05 × 10 4 for 1, 5.48 × 10 3 L mol −1 for 2, respectively), which are the first observations of fluorescent MOFs for the sensing of enrofloxacin and MnO 4 − anions.