A dual-emissive europium-based metal–organic framework for selective and sensitive detection of Fe3+ and Fe2+. Issue 39 (14th September 2021)

• Record Type: Journal Article
• Authors: Zhao, Yuming; Liu, Jinhui; Wang, Sha; Zhai, Xu; Shao, Lei; Liu, Yunling; Zhang, Xuemin; Chen, Junyi; Meng, Fanbao; Fu, Yu
• Is Part Of: Dalton transactions. Volume 50:Issue 39(2021)
• Page Start: 13823
• Page End: 13829
• Publication Date: 2021-09-14
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d1dt02249k
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : A novel dual-emissive Eu-BDC-OH material as a ratiometric fluorescent probe can easily distinguish Fe 3+ and Fe 2+ . Abstract : A dual-emissive optical material as a ratiometric fluorescent probe has been demonstrated to be remarkably superior in precise and quantitative analyses. Herein, a novel dual-emissive fluorescent probe Eu-BDC-OH was designed and successfully synthesized using Eu 3+ and 2-hydroxyterephthalic acid (H2 BDC-OH) at room temperature. Eu-BDC-OH has a three-dimensional interpenetrating network structure with a large number of exposed hydroxyl functional groups, providing abundant active sites for molecular recognition. In particular, the as-obtained Eu-BDC-OH serves as a unique fluorescent probe, and the double emission peaks of both the ligand and Eu 3+ are completely quenched by Fe 3+ . However, it is worth noting that the dual emissions of Eu-BDC-OH enable the ratiometric detection of Fe 2+, which leads to an increase in ligand emission and a decrease in Eu 3+ emission, accompanied by a distinct red to blue color transition. The relative fluorescence intensity ratio ( I 618 nm / I 433 nm ) decreased linearly with increasing Fe 2+ concentration in the 0–50 μM range with a superior detection limit of 0.32 μM. In this work, a fluorescent probe based on a MOF was developed for the recognition of Fe 2+ and Fe 3+, providing a promising strategy for the synthesis of novel dual-emission materials by integrating suitable luminescent ligands with lanthanide metal ions.