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DFT/TDDFT investigation on the D–π–A type molecule probes 4-(5-R-thiophen-2-yl)-2-isobutyl-2H-[1,2,3]triazolo[4,5-e][1,2,4] triazolo[1,5-a]pyrimidines: fluorescence sensing mechanism and roles of weak interactions

  • Yinhua Ma
  • Liqiang Feng
  • Jianyong Liu
  • Yanqiang Yang
  • Tianshu ChuEmail author
Regular Article
  • 70 Downloads

Abstract

We performed DFT/TDDFT investigation on the sensing mechanism of the D–π–A type fluorescence probes 4-(5-R-thiophen-2-yl)-2-isobutyl-2H-[1,2,3]triazolo[4,5-e][1,2,4] triazolo[1,5-a]pyrimidines (ITTP1, ITTP2, ITTP3), which are designed for detecting 2,4,6-trinitrophenol (TNP) explosive. Theoretical calculations reveal that the fluorescence sensing mechanism was induced by the combination of the π–π stacking interaction and photo-induced electron transfer. The blueshift in the UV–Vis spectrum of the ITTP sensors was correlated with the decrease in electron-donating ability of the molecule probes and was further evidenced by the calculated 1H NMR spectra and DCT index. The roles of the weak interactions: π–π stacking and hydrogen-bonding interaction for the probes fluorescence sensing process were analyzed, and the π–π stacking interaction was verified to be the dominant for the fluorescence sensing. The present finding should be useful for the future design of explosive fluorescent probes and the interpretation of the sensing mechanisms.

Keywords

Explosive fluorescent probes π–π stacking Hydrogen-bonding interaction Photo-induced electron transfer (PET) Time-dependent density functional theory (TDDFT) method 

Notes

Acknowledgements

This work was supported by the Science Challenging Program (JCKY2016212A501), the National Natural Science Foundation of China (Grant No. 21273234) and the Open Fund of the State Key Laboratory of Molecular Reaction Dynamics in DICP, CAS (SKLMRD-K201817).

Supplementary material

214_2019_2520_MOESM1_ESM.docx (1.4 mb)
Supplementary material 1 (DOCX 1400 kb)

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Authors and Affiliations

  1. 1.State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalianPeople’s Republic of China
  2. 2.School of Physics Science, State Key Laboratory of Bio-Fibers and Eco-TextilesQingdao UniversityQingdaoPeople’s Republic of China
  3. 3.Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid PhysicsChina Academy of Engineering PhysicsMianyangPeople’s Republic of China
  4. 4.University of Chinese Academy of SciencesBeijingPeople’s Republic of China
  5. 5.College of ScienceLiaoning University of TechnologyJinzhouPeople’s Republic of China

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