Video Experimental Relacionado

Updated: Jun 16, 2026

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

Published on: April 19, 2019

Parpadeo redox de una sola molécula de derivados de perileno diimida en el agua

Thorben Cordes¹, Jan Vogelsang, Milena Anaya

¹Angewandte Physik-Biophysik, and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität München, Germany.

Journal of the American Chemical Society

|February 4, 2010

Resumen

Los investigadores desarrollaron nuevos fluoróforos de perileno dicarboximida (PDI) solubles en agua para microscopía avanzada. Estos tintes PDI exhiben fluorescencia brillante y estable y parpadeo controlable, lo que permite imágenes de superresolución y aplicaciones de espectroscopia de molécula única.

Área de la Ciencia:

Física Química Física Química es la física de la química.
La biofísica es la biofísica.
La espectroscopia es una técnica de espectroscopia.

Sus antecedentes:

La microscopía de fluorescencia avanzada requiere una mayor fotostabilidad y funcionalidad en los marcadores fluorescentes.
Los fluoróforos de perileno dicarboxímido (PDI) ofrecen potencial pero requieren optimización para entornos acuosos y emisión controlada.

Objetivo del estudio:

Para investigar los fluoróforos PDI solubles en agua para microscopía ultrasensible y de superresolución.
Demostrar el control de la fluorescencia PDI a través de la transferencia de electrones fotoinducida para nuevas técnicas de imagen.

Principales métodos:

Se empleó la espectroscopia de molécula única para estudiar los fluoróforos PDI inmovilizados en el ADN en un tampón acuoso.
Se utilizaron reacciones de transferencia de electrones fotoinducidas utilizando diferentes concentraciones de reductores y oxidantes para modular la fluorescencia.
Se aplicaron los potenciales redox de PDI y el concepto de sistema reductor y oxidante (ROXS) para explicar las propiedades observadas.

Principales resultados:

Los fluoróforos PDI inmovilizados exhibieron una fluorescencia brillante con distribuciones espectrales y de tiempo de desintegración homogéneas, comparables a los estándares actuales de una sola molécula.
La fluorescencia PDI podría cambiarse de forma controlable entre los estados de emisión parpadeante y estable mediante el ajuste de las concentraciones de reductor/oxidante.
El control de fluorescencia observado se explicó por los potenciales redox de PDI y el concepto ROXS.

Conclusiones:

Los fluoróforos PDI solubles en agua, cuando están inmovilizados en el ADN, son adecuados para la espectroscopia de una sola molécula y la microscopia avanzada.
La fluorescencia controlable a través de reacciones redox abre nuevas vías para la obtención de imágenes de superresolución, como la "microscopía de parpadeo" en varios medios.

Más Videos Relacionados

[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

[(DPEPhos)(bcp)Cu]PF₆: A General and Broadly Applicable Copper-Based Photoredox Catalyst

Published on: May 21, 2019

A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles

A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles

Published on: November 14, 2015

Videos de Conceptos Relacionados

Redox Reactions

Redox Reactions

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...

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.

Pericyclic Reactions: Introduction

Pericyclic Reactions: Introduction

Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
Pericyclic reactions can be classified into three categories: electrocyclic reactions, cycloaddition reactions, and sigmatropic rearrangements. Electrocyclic reactions and sigmatropic rearrangements are...

Photochemical Electrocyclic Reactions: Stereochemistry

Photochemical Electrocyclic Reactions: Stereochemistry

The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation

Radical Reactivity: Intramolecular vs Intermolecular

Radical Reactivity: Intramolecular vs Intermolecular

Radical reactions can occur either intermolecularly or intramolecularly. In an intermolecular radical reaction, a nucleophilic radical adds to an electrophilic alkene or vice versa. In such reactions, the radical and generally the alkene, which is also called the radical trap, are two different molecules. Additionally, for such intermolecular reactions to occur, the radical trap must be active, present in an excess concentration, and the radical starting material must have a weak carbon–halogen...