Video Experimental Relacionado

Updated: Mar 2, 2026

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

Ensamblaje supramolecular de lantánidos luminiscentes sintonizables basado en la fotorreacción del antraceno

Yan Zhou¹, Heng-Yi Zhang^1,2, Zhi-Yuan Zhang¹

¹Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University , Tianjin 300071, P. R. China.

Journal of the American Chemical Society

|May 17, 2017

Resumen

Los investigadores desarrollaron un nuevo conjunto supramolecular utilizando una molécula fotosensible y metales lantánidos. Este material exhibe luminiscencia conmutable, ofreciendo una nueva vía para el diseño de materiales funcionales sensibles a múltiples estímulos.

Área de la Ciencia:

Química supramolecular
Ciencias de los materiales
La luminiscencia

Sus antecedentes:

Los materiales de luminiscencia de lantánidos son superiores para aplicaciones emisoras de luz.
Los materiales funcionales avanzados requieren diseños nuevos.

Objetivo del estudio:

Para preparar un ensamblaje supramolecular con luminiscencia lantánida conmutable.
Explorar un nuevo método de diseño para materiales sensibles a múltiples estímulos.

Principales métodos:

Coordinación de una molécula huésped (1) con el metal dilantanuro.
Utilizando un núcleo de 9,10-difenilantraceno para la fotosensibilidad.
Utilizando las funcionalidades de terpiridina y dibenzo-24-corona-8.

Principales resultados:

El ensamblaje exhibió una excelente luminiscencia lantánida después de una fotorreacción.
La luminiscencia se enciende y se apaga de manera reversible a través de la irradiación de luz o el calentamiento.
Se ha demostrado un mecanismo fototérmico controlado.

Conclusiones:

El diseño de polímero supramolecular desarrollado es una vía conveniente para materiales sensibles a múltiples estímulos.
Este enfoque permite la ingeniería de materiales funcionales avanzados con luminiscencia ajustable.

Más Videos Relacionados

Facile Preparation and Photoactivation of Prodrug-Dye Nanoassemblies

Facile Preparation and Photoactivation of Prodrug-Dye Nanoassemblies

Published on: February 17, 2023

Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications

Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications

Published on: November 10, 2017

Videos de Conceptos Relacionados

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

The Antenna Complex

The Antenna Complex

Plants and other photosynthetic organisms comprise pigments capable of absorption of direct sunlight. These pigments are present in the reaction center - the main site of photochemical reactions as well as in the antenna complex. Under average light conditions, the rate at which reaction center pigments absorb light is far below the electron transport chain's capacity. As a result, the reaction center alone cannot provide enough energy to drive photosynthesis. The photosynthetic efficiency can...

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.

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...

Thermal and Photochemical Electrocyclic Reactions: Overview

Thermal and Photochemical Electrocyclic Reactions: Overview

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.

The Photochemical Reaction Center

The Photochemical Reaction Center

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...