Rapid and reliable ratiometric fluorescence detection of nitro explosive 2,4,6-trinitrophenol based on a near infrared (NIR) luminescent Zn(II)-Nd(III) nanoring

Yanheng Meng; Yuebo Cheng; Xiaoping Yang; Xiaoli Lv; Xianfeng Huang; Desmond Schipper

doi:10.1016/j.saa.2024.124468

Rapid and reliable ratiometric fluorescence detection of nitro explosive 2,4,6-trinitrophenol based on a near infrared (NIR) luminescent Zn(II)-Nd(III) nanoring

Spectrochim Acta A Mol Biomol Spectrosc. 2024 May 16:318:124468. doi: 10.1016/j.saa.2024.124468. Online ahead of print.

Authors

Yanheng Meng¹, Yuebo Cheng¹, Xiaoping Yang², Xiaoli Lv¹, Xianfeng Huang¹, Desmond Schipper³

Affiliations

¹ College of Chemistry and Materials Engineering, College of Life and Environmental Science, Zhejiang Key Laboratory of Carbon Materials, Wenzhou University, Wenzhou 325035, China.
² College of Chemistry and Materials Engineering, College of Life and Environmental Science, Zhejiang Key Laboratory of Carbon Materials, Wenzhou University, Wenzhou 325035, China. Electronic address: xpyang@wzu.edu.cn.
³ The University of Texas at Austin, Department of Chemistry and Biochemistry, 1 University Station A5300, Austin, TX 78712, United States.

PMID: 38761475
DOI: 10.1016/j.saa.2024.124468

Abstract

Rapid and quantitative detection of 2,4,6-trinitrophenol (TNP) is very crucial for homeland security, military application, and environment protection. Herein, a nine-metal Zn(II)-Nd(III) nanoring 1 with a diameter of 2.3 nm was constructed by the use of a long-chain Schiff base ligand, which shows ratiometric fluorescence response to TNP with high selectivity and sensitivity. The fluorescence sensing behavior of 1 to TNP is expressed by a first-order equation I_1060nm/I_560nm = -0.0128*[TNP] + 0.9723, which can be used to quantitatively analyze TNP concentrations in solution. The limits of detection (LODs) to TNP based on the ligand-centered (LC) and Nd(III) emissions of 1 are 5.93 μM and 3.18 μM, respectively. The fluorescence response mechanism to TNP is attributed to the competitive absorption effect and photoinduced electron transfer (PET). The luminescence quenching of 1 is dominated by static process.

Keywords: Competitive absorption effect; Photoinduced electron transfer; Ratiometric fluorescence response; Static process; TNP detection; Zn(II)-Nd(III) sensor.