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During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
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Reaction centers are pigment-protein complexes that initiate energy conversion from photons to chemical entities. Therefore, photochemical reaction center is a more appropriate term that describes these complexes. The Nobel laureates Robert Emerson and William Arnold provided the first experimental evidence of photochemical reaction centers by demonstrating the participation of nearly 2,500 chlorophyll molecules for the release of just one molecule of oxygen. Despite thousands of photosynthetic...
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Updated: Nov 19, 2025

Electrochemical Detection of Deuterium Kinetic Isotope Effect on Extracellular Electron Transport in Shewanella oneidensis MR-1
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Optically Controlled Electron Transfer in a ReI Complex.

Egmont J Rohwer1, Yan Geng2,3, Maryam Akbarimoosavi1

  • 1Institute of Applied Physics, University of Bern, Sidlerstrasse 5, 3012, Bern, Switzerland.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|February 1, 2021
PubMed
Summary

Ultrafast optical control of intramolecular charge flow in a rhenium complex enables wavelength-selective photocurrent switching. This demonstrates precise control over charge transfer for advanced electronic applications.

Keywords:
AC-Stark spectroscopyReI complexescharge-transfer transitionsligandstime-resolved spectroscopy

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Area of Science:

  • Photochemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Intramolecular charge transfer (ICT) is crucial for optoelectronic devices.
  • Controlling ICT dynamics is key to developing novel functionalities.
  • Rhenium complexes offer tunable electronic properties for charge transfer studies.

Purpose of the Study:

  • To demonstrate ultrafast optical control of intramolecular charge flow.
  • To investigate photocurrent modulation and switching in a rhenium complex.
  • To elucidate the mechanisms of charge transfer processes.

Main Methods:

  • Density Functional Theory (DFT) calculations.
  • AC-Stark spectroscopy to identify charge-transfer states.
  • Ultrafast transient absorption spectroscopy to probe dynamics.

Main Results:

  • Identified two distinct optically active charge-transfer processes: metal-to-ligand charge transfer (MLCT) and intra-ligand charge transfer (ILCT).
  • Observed ILCT state decay in the picosecond regime.
  • Demonstrated effective inhibition of the HOMO-LUMO transition, leading to persistent ILCT absorption band bleaching.

Conclusions:

  • Ultrafast optical control of intramolecular charge flow is achievable.
  • The study paves the way for photocurrent modulation and switching with high wavelength selectivity.
  • Precise control over charge transfer dynamics can be achieved in rhenium complexes.