Bipyridine-linked Three-dimensional Covalent Organic Frameworks for Fluorescence Sensing of Cobalt(II) at Nanomole Level

Overview

Journal Mikrochim Acta

Specialties Biotechnology
Chemistry

Date 2021 Apr 20

PMID 33877439

Authors

Lingshuang Wang

Yujie Chen

Zhen Zhang

Yali Chen

Qiliang Deng

Shuo Wang

Affiliations

Soon will be listed here.

Abstract

A novel fluorometric method based on bipyridine-linked three-dimensional covalent organic frameworks (COFs) was developed for the determination of Co. The COFs were synthesized by the polyreaction of tetrakis(4-aminophenyl)methane (TAPM), 2,2'-bipyridine-5,5'-diamine (Bpy), and 4,4'-biphenyldicarboxaldehyde (BPDA) under solvothermal conditions. The fluorescence of the COFs, with excitation/emission peaks at 324/406 nm, is quenched by Co. Under the optimal conditions, the fluorescence quenching degrees (F-F) of the resulted COFs linearly enhance as the concentrations of Co increase in the range 0.01 to 0.25 μM, and a limit of detection of 2.63 nM is achieved. The fluorescence response mechanism was discussed in detail. This proposed approach has also been successfully employed to determine Co in complex samples (shrimp and tap water), and satisfactory recoveries (88.1 ~ 109.7%) was obtained. The relative standard deviations are below 4.9%.

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