Video Experimental Relacionado

Updated: Feb 19, 2026

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

Published on: June 10, 2021

Ionización y interacción de aniones: una nueva estrategia para el diseño estructural de luminógenos de emisión

Jianguo Wang^1,2, Xinggui Gu¹, Pengfei Zhang¹

¹Department of Chemistry, Hong Kong Branch of Chinese National Engineering, Research Center for Tissue Restoration and Reconstruction, Institute of Molecular Functional Materials, State Key Laboratory of Molecular Nanoscience, Division of Life Science and Biomedical Engineering, The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon, Hong Kong, China.

Journal of the American Chemical Society

|October 31, 2017

Resumen

Las interacciones anión-π+ evitan el apilamiento de π-π, lo que permite nuevos sistemas de emisión inducida por agregación cargada (AIE). Esta estrategia desarrolló nuevos luminógenos AIE con aplicaciones potenciales en bioimagen.

Área de la Ciencia:

Ciencias de los materiales
Química supramolecular
La fotofísica

Sus antecedentes:

Las interacciones aniónicas-π+ son cada vez más reconocidas por su papel en el ensamblaje molecular.
La emisión inducida por agregación (AIE) es un fenómeno en el que los luminógenos presentan una mayor emisión en estados agregados.
El desarrollo de sistemas AIE estables a menudo requiere superar las interacciones intermoleculares perjudiciales como el apilamiento π-π.

Objetivo del estudio:

Proponer y demostrar una nueva estrategia para el desarrollo de sistemas AIE con carga inherente utilizando interacciones anión-π+.
Síntesis y caracterización de nuevos luminógenos AIE activos basados en estructuras de oxazolio.
Investigar el papel de las interacciones anión-π+ en la supresión del apilamiento π-π e influir en las propiedades de la EIA.

Principales métodos:

Síntesis de luminógenos con actividad AIE: 1,2,3,4-tetrafeniloxazolio (TPO-P) y 2,3,5-trifeniloxazolio (TriPO-PN).
Caracterización mediante análisis de un solo cristal, cálculos teóricos y mediciones de conductividad.
Estudio comparativo con los análogos que carecen de interacciones anión-π+ (tetrafenilfurano y 2,4,5-trifeniloxazol).

Principales resultados:

Síntesis exitosa de TPO-P y TriPO-PN, que demuestra las características de AIE.
Las interacciones de anión-π+ en TriPO-PN suprimieron efectivamente el apilamiento de π-π, a diferencia de sus análogos.
Los análogos sin interacciones anión-π+ mostraron una disminución de la emisión causada por la agregación.
TriPO-PN mostró biocompatibilidad y orientación lisosómica específica con una respuesta de activación por fluorescencia.

Conclusiones:

Las interacciones aniónico-π+ proporcionan una estrategia efectiva para bloquear el apilamiento π-π y desarrollar sistemas AIE inherentemente cargados.
Los derivados de oxazolio sintetizados exhiben propiedades AIE sintonizables influenciadas por las interacciones anión-π+.
TriPO-PN se muestra prometedor como agente de contraste biocompatible para la bioimagen específica de lisosomas.

Más Videos Relacionados

Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core

Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core

Published on: October 24, 2017

A Novel Technique for Generating and Observing Chemiluminescence in a Biological Setting

A Novel Technique for Generating and Observing Chemiluminescence in a Biological Setting

Published on: March 9, 2017

Videos de Conceptos Relacionados

Variables Affecting Phosphorescence and Fluorescence

Variables Affecting Phosphorescence and Fluorescence

Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...

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

Photoluminescence: Applications

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...

Metal-Ligand Bonds

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...

Cycloaddition Reactions: MO Requirements for Photochemical Activation

Cycloaddition Reactions: MO Requirements for Photochemical Activation

Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para...