A luminescent terbium coordination complex as multifunctional sensing platform

Zhouqing Xu; Xinglei He; Yaling He; Xiaolei Zhao; Munkhbayar Batmunkh; Huijun Li; Yuan Wang; Jianliang Cao; Tianyi Ma

doi:10.1016/j.talanta.2019.120363

A luminescent terbium coordination complex as multifunctional sensing platform

Talanta. 2020 Feb 1:208:120363. doi: 10.1016/j.talanta.2019.120363. Epub 2019 Sep 17.

Authors

Zhouqing Xu¹, Xinglei He², Yaling He², Xiaolei Zhao², Munkhbayar Batmunkh³, Huijun Li⁴, Yuan Wang², Jianliang Cao², Tianyi Ma⁵

Affiliations

¹ College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, Henan, 454000, China; Discipline of Chemistry, School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW, 2308, Australia.
² College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, Henan, 454000, China.
³ Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, QLD, 4072, Australia.
⁴ College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, Henan, 454000, China. Electronic address: lihuijunxgy@hpu.edu.cn.
⁵ Discipline of Chemistry, School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW, 2308, Australia. Electronic address: tianyi.ma@newcastle.edu.au.

PMID: 31816807
DOI: 10.1016/j.talanta.2019.120363

Abstract

In this paper, we report the synthesis of a multifunctional fluorescent probe Tb-CP, Tb(HL)(EtOH)₂(NO₃)₂ (HPU-10) (H₂L = 2,6-bis-(5-pyridin-4-yl-1H-[1,2,4]triazol-3-yl)- pyridine), and demonstrate that this novel chemosensor has the property of ratiometric detection of Zn²⁺ and Cd²⁺. The detection limit of HPU-10 sensing Zn²⁺ and Cd²⁺ is 0.319 and 0.965 μM, respectively. The sensing mechanism can be explained by (i) the decomposition of HPU-10 and (ii) the recombination of Zn²⁺ or Cd²⁺ with ligand forming 2HL^--Zn²⁺ or 2HL^--Cd²⁺, respectively. Moreover, the fluorescent sensor HPU-10 can detect the nitroaromatic compound 2, 4-DNP via a fluorescence quenching mechanism. The detection limits obtained from linear regression curve plots of 2, 4-DNP is calculated to be 1.69 μM. In addition, the possible use of the probe coated paper for tracing the target analytes has also been presented.

Keywords: Fluorescence; Metal-organic framework; Nitroaromatic compound; Ratiometric sensor.