A luminescent Cd(II)-metal organic frameworks combined of TPT and H3BTC detecting 2,4,6-trinitrophenol and chromate anions in aqueous

Jinxue Li; Nanxi Zhang; Ye Yuan; Xiangyu Li; Maoquan Wu; Qingfeng Yang; Xiaoyang Yu; Xiao Zhang; Yan Wang

doi:10.1016/j.saa.2020.118790

A luminescent Cd(II)-metal organic frameworks combined of TPT and H₃BTC detecting 2,4,6-trinitrophenol and chromate anions in aqueous

Spectrochim Acta A Mol Biomol Spectrosc. 2020 Dec 5:242:118790. doi: 10.1016/j.saa.2020.118790. Epub 2020 Aug 5.

Authors

Jinxue Li¹, Nanxi Zhang², Ye Yuan³, Xiangyu Li¹, Maoquan Wu¹, Qingfeng Yang⁴, Xiaoyang Yu⁵, Xiao Zhang⁶, Yan Wang⁷

Affiliations

¹ MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, People's Republic of China.
² School of Life Science and Technology, Harbin Institute of Technology, Harbin, People's Republic of China.
³ Center of Analysis, Measurement and Computing, Harbin Institute of Technology, Harbin, People's Republic of China.
⁴ State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, People's Republic of China.
⁵ Jilin Institute of Chemical Technology, Jilin City, Jilin 132022, People's Republic of China.
⁶ MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, People's Republic of China.. Electronic address: zhangx@hit.edu.cn.
⁷ MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, People's Republic of China.. Electronic address: wangy_msn@hit.edu.cn.

PMID: 32795950
DOI: 10.1016/j.saa.2020.118790

Abstract

A new luminescence Cd(II)-MOF (1) ([Cd₃(BTC)₂(TPT)(H₂O)₂]·4H₂O, TPT = tris(4-pyridyl)triazine, H₃BTC = 1,3,5-benzenetricarboxylic acid) was successfully synthesized under solvothermal conditions. 1 contains 3D framework which consist of Cd atoms and btc^3- anions with the large channels along c axis. Then, tpt ligands locate in the channels by utilizing three N atoms to bridge two Cd1 atoms and one Cd2 atom. 1 not only possesses remarkable thermal stability, but also can steadily exist in different organic solvents and various acid/base solutions (pH = 3-12). Moreover, 1 can detect 2,4,6-trinitrophenol (TNP) and chromate (CrO₄^2-/Cr₂O₇^2-) anions with high selectivity and sensitivity in water via the luminescent quenching. The detection limits of 1 for TNP and CrO₄^2-/Cr₂O₇^2- are 6.23 μM and 2.13 μM/2.87 μM. The mechanism of TNP luminescence quenching may be attributed to photoinduced electron transfer and resonance energy transfer, and CrO₄^2-/Cr₂O₇^2- quenching involves resonance energy transfer and competitive absorption of light. Additionally, 1 has the great anti-interference ability and repeatability for detecting TNP and CrO₄^2-/Cr₂O₇^2-, which can display the feasibility of this material as a stable luminescent probe in aqueous system.

Keywords: 2,4,6-trinitrophenol (TNP); Chromate (CrO(4)(2−)/Cr(2)O(7)(2−)) anions; Crystal structure; Fluorescent quenching; Metal organic framework.