scholarly journals Sensing mechanism of a new fluorescent probe for hydrogen sulfide: photoinduced electron transfer and invalidity of excited-state intramolecular proton transfer

RSC Advances ◽  
2021 ◽  
Vol 11 (36) ◽  
pp. 22214-22220
Author(s):  
Xiumin Liu ◽  
Yutai Qi ◽  
Shenhan Pu ◽  
Yi Wang ◽  
Ziqing Gao
Keyword(s):  
Electron Transfer ◽  
Hydrogen Sulfide ◽  
Excited State ◽  
Fluorescence Quenching ◽  
Photoinduced Electron Transfer ◽  
Stokes Shift ◽  
Fluorescence Emission ◽  
Intramolecular Proton Transfer ◽  
Strong Fluorescence ◽  
Theoretical Results

Our theoretical results show that the fluorescence quenching of DFAN is caused by PET mechanism and the large Stokes shift fluorescence emission of DFAH is not due to the ESIPT mechanism. Due to the absence of PET process, enol structure emits strong fluorescence, which is inconsistent with the fluorescence mechanism in the experiment.

Discrimination of tabun mimic diethyl cyanophosphonate from sarin mimic diethyl chlorophosphate via Zn(ii)-triggered photoinduced electron transfer-decoupled excited state intramolecular proton transfer processes

2017 ◽  
Vol 41 (14) ◽  
pp. 6661-6666 ◽  
Author(s):  
Abhishek Manna ◽  
Kanyashree Jana ◽  
Nikhil Guchhait ◽  
Shyamaprosad Goswami
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Proton Transfer ◽  
Photoinduced Electron Transfer ◽  
Nerve Agent ◽  
Intramolecular Proton Transfer ◽  
Transfer Processes

PET-coupled ESIPT platform and its Zn2+ complex are used for the discrimination of the nerve agent mimics DCNP and DCP.

Photoinduced electron transfer between quantum dots and pralidoxime: an efficient sensing strategy

2017 ◽  
Vol 41 (19) ◽  
pp. 10828-10834 ◽  
Author(s):  
A. R. Jose ◽  
A. E. Vikraman ◽  
K. Girish Kumar
Keyword(s):  
Quantum Dots ◽  
Electron Transfer ◽  
Fluorescence Quenching ◽  
Photoinduced Electron Transfer ◽  
Cds Quantum Dots

Photoinduced electron transfer (PET)-mediated fluorescence quenching of CdTe/CdS quantum dots by pralidoxime (PAM).

Polypyrrole/Graphene Quantum Dot Composites as a Sensor Media for Epinephrine

2020 ◽  
Vol 20 (7) ◽  
pp. 4005-4010 ◽  
Author(s):  
Thi Hoa Le ◽  
Dal Ho Lee ◽  
Ji Hyeon Kim ◽  
Sang Joon Park
Keyword(s):  
Quantum Dot ◽  
Photoinduced Electron Transfer ◽  
Surface Passivation ◽  
Fluorescence Emission ◽  
Fluorescence Signal ◽  
Serum Samples ◽  
Strong Fluorescence ◽  
Electron Transfer Process ◽  
Graphene Quantum Dot ◽  
Amine Groups

In this paper, we discuss a new biosensor for simple and rapid detection of epinephrine (EP) based on polypyrrole/graphene quantum dot (PPy/GQD) composites. Presence of amine groups on the PPy backbone leads to surface passivation of GQDs. As a result, the composites exhibit strong fluorescence emission, which can be up to three times that of pristine GQDs. In neutral to alkaline solution, the EP on the surface of PPy/GQD composites is converted to a quinone, which triggers the fluorescence quenching of PPy/GQD composites via a photoinduced electron transfer process. Hence, the concentration of EP can be effectively monitored by measuring the variation in the fluorescence signal of PPy/GQD composites. The quenched fluorescence intensity of PPy/GQDs was proportional to the concentration of EP (0.7–400 μM). We used our method to determine the concentration of EP in human serum samples and obtained satisfactory results.

Photoinduced Electron Transfer from a Higher Excited State of a Porphyrin in a Zinc Porphyrin−Ruthenium(II)tris-Bipyridine Dyad

1999 ◽  
Vol 103 (5) ◽  
pp. 557-559 ◽  
Author(s):  
Denis LeGourriérec ◽  
Mikael Andersson ◽  
Jan Davidsson ◽  
Emad Mukhtar ◽  
Licheng Sun ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Photoinduced Electron Transfer ◽  
Zinc Porphyrin
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