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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
- Source :
- Theoretical Chemistry Accounts. 139
- Publication Year :
- 2019
- Publisher :
- Springer Science and Business Media LLC, 2019.
-
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.
- Subjects :
- 010304 chemical physics
Chemistry
Stacking
Time-dependent density functional theory
010402 general chemistry
01 natural sciences
Fluorescence
Spectral line
0104 chemical sciences
Blueshift
Crystallography
Electron transfer
0103 physical sciences
Proton NMR
Molecule
Physical and Theoretical Chemistry
Subjects
Details
- ISSN :
- 14322234 and 1432881X
- Volume :
- 139
- Database :
- OpenAIRE
- Journal :
- Theoretical Chemistry Accounts
- Accession number :
- edsair.doi...........bd4ef43e26975b301ce8ba570776a449