Video Experimental Relacionado
Updated: Feb 11, 2026

11:37
Cellular Redox Profiling Using High-content Microscopy
Published on: May 14, 2017
11.6K
Explotación de la inversión potencial para la transferencia multielectrónica fotoinducida y la acumulación de
Julia Nomrowski1, Oliver S Wenger1
1Department of Chemistry , University of Basel , St. Johanns-Ring 19 , 4056 Basel , Switzerland.
Journal of the American Chemical Society
|April 14, 2018
Resumen
Este estudio demuestra un sistema molecular que utiliza la luz para almacenar dos electrones, lo que permite una catálisis multielectrónica eficiente. Este avance hace avanzar la fotosíntesis artificial y el almacenamiento de energía redox.
Área de la Ciencia:
- Química molecular
- La fotoquímica
- Catálisis
Sus antecedentes:
- Los sistemas artificiales para la transferencia de múltiples electrones son cruciales para el almacenamiento y la catálisis de energía.
- El control de los estados redox en ensamblajes moleculares sigue siendo un desafío significativo.
Objetivo del estudio:
- Desarrollar un sistema molecular capaz de transferencia multielectrónica fotoinducida y acumulación de equivalente redox reversible.
- Investigar la inversión potencial de una molécula aceptora para mejorar el almacenamiento de carga.
- Demostrar el uso de este sistema para la catálisis fotorredóxica multielectrónica.
Principales métodos:
- Síntesis de una heptada molecular compuesta por donantes, fotosensibilizadores y un aceptor.
- Caracterización electroquímica para determinar los potenciales de reducción y de inversión.
- Estudios fotoquímicos para evaluar la formación del estado de carga separada, el tiempo de vida y el rendimiento cuántico.
- Experimentos catalíticos con el heptad para reducir los disulfuros alifáticos.
Principales resultados:
- Una heptada molecular logró la transferencia y acumulación de dos electrones fotoinducidos.
- Se observó una inversión de potencial significativa (1.3 V) para el aceptador de dibenzo [1, 2].
- Se formó un estado reducido estable de dos electrones con una vida útil de 66 ns y un rendimiento cuántico del 0,5%.
- El heptad catalizó la reducción de dos electrones de los disulfuros alifáticos.
Conclusiones:
- La inversión potencial es una estrategia viable para la acumulación de equivalente redox impulsada por la luz en sistemas artificiales.
- El estado de carga acumulada demostrado sirve como una plataforma efectiva para la catálisis fotorredóxica multielectrónica.
- Este trabajo proporciona una prueba de concepto para el almacenamiento de energía redox avanzada y aplicaciones catalíticas.
Videos de Conceptos Relacionados
Balancing Redox Equations
62.5K
Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
62.5K
Redox Reactions
58.9K
Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
58.9K
Redox Reactions
1.1K
Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
1.1K
Cell Potential and Free Energy
46.7K
Thermodynamics of a Redox Reaction
Thermodynamics is the branch of physics dealing with the relationship between heat and other forms of energy. In an electrochemical cell, chemical energy is converted into electrical energy.
Thus, a link can be predicted between cell potential, free energy change, and the equilibrium constant for the reaction. Cell potential can also be measured as the oxidant or the reducing strength, and similar acid-base strength measures are reflected in equilibrium...
Thermodynamics is the branch of physics dealing with the relationship between heat and other forms of energy. In an electrochemical cell, chemical energy is converted into electrical energy.
Thus, a link can be predicted between cell potential, free energy change, and the equilibrium constant for the reaction. Cell potential can also be measured as the oxidant or the reducing strength, and similar acid-base strength measures are reflected in equilibrium...
46.7K
Electron Configuration of Multielectron Atoms
65.3K
The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
65.3K
Pharmaceutical Equivalents
208
As defined by regulatory standards, pharmaceutical equivalents require generic drug products to have identical dosage forms and chemically identical active pharmaceutical ingredients (APIs). They must adhere to compendial or applicable standards for potency, content uniformity, disintegration times, and dissolution rates. In the case of modified-release dosage forms, variations in drug content are permissible as long as the delivered amount remains consistent with the innovator drug product.
208

