Study on Fluorescence Recognition of Fe3+, Cr2O72- and p-Nitrophenol by a Cadmium Complex and Related Mechanism

Lu Liu; Jian-Min Li; Hui-Jie Wang; Meng-Di Zhang; Yu Xi; Jie Xu; Yuan-Yuan Huang; Bo Zhang; Ying Li; Zhen-Bei Zhang; Zi-Fang Zhao; Cheng-Xing Cui

doi:10.3390/molecules28041848

Study on Fluorescence Recognition of Fe³⁺, Cr₂O₇^2- and p-Nitrophenol by a Cadmium Complex and Related Mechanism

Molecules. 2023 Feb 15;28(4):1848. doi: 10.3390/molecules28041848.

Authors

Lu Liu¹, Jian-Min Li², Hui-Jie Wang¹, Meng-Di Zhang¹, Yu Xi¹, Jie Xu¹, Yuan-Yuan Huang¹, Bo Zhang¹, Ying Li¹, Zhen-Bei Zhang¹, Zi-Fang Zhao¹, Cheng-Xing Cui¹

Affiliations

¹ School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Xinxiang 453003, China.
² School of Resources and Environment, Henan Institute of Science and Technology, Xinxiang 453003, China.

Abstract

The effective detection of environmental pollutants is very important to the sustainable development of human health and the environment. A luminescent Cd(II) coordination complex, {[Cd(dbtdb)(1,2,4-H₃btc)]·0.5H₂O}_n (1) (dbtdb = 1-(2,3,5,6-tetramethyl-4-((2-(thiazol-4-yl)-2H-benzo[d]imidazol-3(3aH)-yl)methyl)benzyl)-2,7a-dihydro-2-(thiazol-4-yl)-1H-benzo[d]imidazole, 1,2,4-H₃btc = 1,2,4-benzenetricarboxylic acid), was obtained by hydrothermal reactions. Complex 1 has a chain structure decorated with uncoordinated Lewis basic O and S donors and provides good sensing of Fe³⁺, Cr₂O₇^2-, and p-nitrophenol with fluorescence quenching through an energy transfer process. The calculated binding constants were 3.3 × 10³ mol^-1 for Fe³⁺, 2.36 × 10⁴ mol^-1 for Cr₂O₇^2-, and 9.3 × 10³ mol^-1 for p-nitrophenol, respectively. These results show that 1 is a rare multiresponsive sensory material for efficient detection of Fe³⁺, Cr₂O₇^2-, and p-nitrophenol.

Keywords: coordination complex; fluorescence recognition; mechanism.

Grants and funding

This research was funded by the Key Scientific Research Project of Colleges and Universities in Henan Province (No. 23A150039), Key Scientific and Technological Project of Henan Province (No. 222102320259 and 222102240001 and 212102210304 and 222102310117), Henan University of Science and Technology innovation and entrepreneurship training program for college students (No. 2022CX095), Training Plan for University’s Young Backbone Teachers of Henan Province (No. 2019GGJS170).