Two 3D Zn(II)/Co(II)-CPs as fluorescent sensors for turn-on and red-shift sensing of tryptophan and norfloxacin

• Published in: Journal of molecular structure 2024-06, Vol.1305, p.137821, Article 137821
• Main Authors: Zhao, Zi-Hao, Zhao, Fang-Hua, Li, Zhong-Lin, Li, Yu-Shuo, Feng, Rui, You, Jin-Mao, He, Yuan-Chun
• Format: Article
• Language: English
• Subjects: dia topology; Fluorescence sensing; Norfloxacin; Tryptophan; Zn(II)/Co(II) CPs
• ISSN: 0022-2860; 1872-8014
• DOI: 10.1016/j.molstruc.2024.137821

•Two new 3D Zn(II)/Co(II) CPs of sebacic acid and bbimb ligands are discribed.•CPs 1 and 2 display as 5-fold interpenetrating dia topology.•Both CPs exhibit selective sensing toward tryptophan and norfloxacin via turn-on and red shift effects. Two three-dimensional (3D) coordination polymers (CPs), namely {[M(seb)(bbimb)]·3H2O}n (M = Zn for 1; Co for 2), were obtained via hydrothermal method using sebacic acid (H2seb) mixed with 1,4-bis(benzoimidazol-1-yl)butane (bbimb). The structures of 1 and 2 both display as 3D frameworks with a 5-fold interpenetrating dia topology. CPs 1 and 2 both exhibit excellent luminescent properties and good water stability. Fluorescence sensing experiments demonstrate that 1 and 2 both can selectively detect tryptophan (Trp) and norfloxacin (Nor) in aqueous solution through turn-on and red-shift effect with remarkable anti-interference ability and low detection limits. The limits of detection (LOD) toward Trp-and Nor are 0.07 μM, 0.08 μM for 1 and 0.41 μM, 0.11 μM for 2. In addition, theoretical calculations and different detection methods were utilized to thoroughly investigate the potential sensing mechanisms for Trp-and Nor. Importantly, 1 and 2 represent two rare examples for sensing both Trp-and Nor via turn-on and red-shift effects. The fluoresence test films of 1 and 2 were prepared which can detect Trp-and Nor quickly with naked eye. [Display omitted] Two new 3D Zn(II)/Co(II) CPs of sebacic acid and bbimb ligands are discribed. CPs 1 and 2 display as 5-fold interpenetrating dia topology. Both CPs were confirmed to be luminescent sensors for detection of tryptophan (Trp) and norfloxacin (Nor) in aqueous solution through turn-on and red shift effects.