Fluorescent Quinoline-Based Supramolecular Gel for Selective and Ratiometric Sensing Zinc Ion with Multi-Modes
Qingqing Han,
Qingqing Wang,
Aiping Gao,
Xuefei Ge,
Rong Wan,
Xinhua Cao
Affiliations
Qingqing Han
Henan Province Key Laboratory of Utilization of Non-Metallic Mineral in the South of Henan Green Catalysis, Synthesis Key Laboratory of Xinyang City, College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China
Qingqing Wang
Henan Province Key Laboratory of Utilization of Non-Metallic Mineral in the South of Henan Green Catalysis, Synthesis Key Laboratory of Xinyang City, College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China
Aiping Gao
Henan Province Key Laboratory of Utilization of Non-Metallic Mineral in the South of Henan Green Catalysis, Synthesis Key Laboratory of Xinyang City, College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China
Xuefei Ge
Henan Province Key Laboratory of Utilization of Non-Metallic Mineral in the South of Henan Green Catalysis, Synthesis Key Laboratory of Xinyang City, College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China
Rong Wan
Henan Province Key Laboratory of Utilization of Non-Metallic Mineral in the South of Henan Green Catalysis, Synthesis Key Laboratory of Xinyang City, College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China
Xinhua Cao
Henan Province Key Laboratory of Utilization of Non-Metallic Mineral in the South of Henan Green Catalysis, Synthesis Key Laboratory of Xinyang City, College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China
A gelator 1 containing functional quinoline and Schiff base groups that could form organogels in DMF, DMSO, acetone, ethanol and 1,4-dioxane was designed and synthesized. The self-assembly process of geator 1 was characterized by field emission scanning electron microscopy (FESEM), UV-vis absorption spectroscopy, fluorescence emission spectroscopy, Fourier transform infrared spectroscopy(FTIR), X-ray powder diffraction (XRD) and water contact angle. Under non-covalent interactions, gelator 1 self-assembled into microbelts and nanofiber structures with different surface wettability. Weak fluorescence was emitted from the solution and gel state of 1. Interestingly, gelator 1 exhibited good selectivity and sensitivity towards Zn2+ in solution and gel states along with its emission enhancement and change. The emission intensity at 423 nm of solution 1 in 1,4-dioxane was slightly enhanced, and a new emission peak appeared at 545 nm along with its intensity sequentially strengthened in the titration process. The obvious ratiometric detection process was presented with a limit of detection (LOD) of 5.51 μM. The detection mechanism was revealed by a theoretical calculation and NMR titration experiment, which was that Zn2+ induced the transition from trans- to cis- of molecule 1 and further coordinated with 1. This study will introduce a new method for the construction of functional self-assembly gel sensors for the detection of Zn2+.
