scholarly journals Photo-Induced Electron Transfer from Dye or Quantum Dot to TiO2 Nanoparticles at Single Molecule Level

10.5772/24378 ◽  
2011 ◽  
Author(s):  
King-Chuen Lin ◽  
Chun-Li Chang
Keyword(s):  
Electron Transfer ◽  
Quantum Dot ◽  
Tio2 Nanoparticles ◽  
Single Molecule ◽  
Single Molecule Level ◽  
Photo Induced Electron Transfer

Electron Transfer in a Naphthalene Diimide System Studied by Single-Molecule Delayed Fluorescence

2020 ◽  
Vol 73 (8) ◽  
pp. 699
Author(s):  
Rosalind P. Cox ◽  
Saman Sandanayake ◽  
Steven J. Langford ◽  
Toby D. M. Bell
Keyword(s):  
Electron Transfer ◽  
Single Molecule ◽  
Delayed Fluorescence ◽  
Pmma Film ◽  
Time Resolved ◽  
Single Molecule Level ◽  
Film Interpretation ◽  
Fluorescence Measurements ◽  
Naphthalene Diimide ◽  
Prompt And Delayed Fluorescence

Electron transfer (ET) is a key chemical reaction in nature and has been extensively studied in bulk systems, but remains challenging to investigate at the single-molecule level. A previously reported naphthalene diimide (NDI)-based system (Higginbotham et al., Chem. Commun. 2013, 49, 5061–5063) displays delayed fluorescence with good quantum yield (~0.5) and long-lived (nanoseconds) prompt and delayed fluorescence lifetimes, providing an opportunity to interrogate the underlying ET processes in single molecules. Time-resolved single-molecule fluorescence measurements enabled forward and reverse ET rate constants to be calculated for 45 individual molecules embedded in poly(methylmethacrylate) (PMMA) film. Interpretation of the results within the framework of Marcus–Hush theory for ET demonstrates that variation in both the electronic coupling and the driving force for ET is occurring from molecule to molecule within the PMMA film and over time for individual molecules.

Reversible Intramolecular Electron Transfer at the Single-Molecule Level

2003 ◽  
Vol 115 (35) ◽  
pp. 4341-4346 ◽  
Author(s):  
Roel Gronheid ◽  
Alina Stefan ◽  
Mircea Cotlet ◽  
Johan Hofkens ◽  
Jianqiag Qu ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Single Molecule ◽  
Intramolecular Electron Transfer ◽  
Single Molecule Level

scholarly journals Transition from stochastic events to deterministic ensemble average in electron transfer reactions revealed by single-molecule conductance measurement

2019 ◽  
Vol 116 (9) ◽  
pp. 3407-3412 ◽  
Author(s):  
Yueqi Li ◽  
Hui Wang ◽  
Zixiao Wang ◽  
Yanjun Qiao ◽  
Jens Ulstrup ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Single Molecule ◽  
Electron Transfer Reaction ◽  
Transfer Reactions ◽  
Ensemble Averaging ◽  
Electron Transfer Reactions ◽  
Single Molecule Level ◽  
Individual Reaction ◽  
Stochastic Events ◽  
The Individual

Electron transfer reactions can now be followed at the single-molecule level, but the connection between the microscopic and macroscopic data remains to be understood. By monitoring the conductance of a single molecule, we show that the individual electron transfer reaction events are stochastic and manifested as large conductance fluctuations. The fluctuation probability follows first-order kinetics with potential dependent rate constants described by the Butler–Volmer relation. Ensemble averaging of many individual reaction events leads to a deterministic dependence of the conductance on the external electrochemical potential that follows the Nernst equation. This study discloses a systematic transition from stochastic kinetics of individual reaction events to deterministic thermodynamics of ensemble averages and provides insights into electron transfer processes of small systems, consisting of a single molecule or a small number of molecules.

Electron transfer behaviour of biological macromolecules towards the single-molecule level

2003 ◽  
Vol 15 (18) ◽  
pp. S1873-S1890 ◽  
Author(s):  
Jingdong Zhang ◽  
Mikala Grubb ◽  
Allan G Hansen ◽  
Alexander M Kuznetsov ◽  
Anja Boisen ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Single Molecule ◽  
Biological Macromolecules ◽  
Single Molecule Level

scholarly journals A Novel Complex: A Quantum Dot Conjugated to an Active T7RNA Polymerase

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Mette Eriksen ◽  
Peter Horvath ◽  
Michael A. Sørensen ◽  
Szabolcs Semsey ◽  
Lene B. Oddershede ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Rna Polymerase ◽  
Single Molecule ◽  
Rna Polymerases ◽  
Fluorescent Signal ◽  
Single Molecule Level ◽  
Single Molecule Studies ◽  
Novel Complex ◽  
Luminescent Nanoparticle

To perform single-molecule studies of the T7RNA polymerase, it is crucial to visualize an individual T7RNA polymerase, for example, through a fluorescent signal. We present a novel complex combining two different molecular functions, an active T7RNA polymerase and a highly luminescent nanoparticle, a quantum dot. The complex has the advantage of both constituents: the complex can traffic along DNA and simultaneously be visualized, both at the ensemble and at the single-molecule level. The labeling was mediated through anin vivobiotinylation of a His-tagged T7RNA polymerase and subsequent binding of a streptavidin-coated quantum dot. Our technique allows for easy purification of the quantum dot labeled T7RNA polymerases from the reactants. Also, the conjugation does not alter the functionality of the polymerase; it retains the ability to bind and transcribe.

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