Video Experimental Relacionado
Updated: May 5, 2026
12:21
Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
Published on: April 4, 2016
11.3K
Generación armónica inducida por nanoencapsulación en cocristales complejos anfitrión-invitado basados en pilararenos
Haozhong Liang1,2, Yuting Yang3, Li Shao4
1Stoddart Institute of Molecular Science, Department of Chemistry, Zhejiang University, Hangzhou 310058, China.
Journal of the American Chemical Society
|January 24, 2023
Resumen
Los investigadores utilizaron anfitriones pillar [1] para encapsular moléculas ópticas no lineales (NLO), controlando sus arreglos de estado sólido. Este método generó con éxito una fuerte segunda generación armónica (SHG) en algunos casos, mientras que en otros la apagó, allanando el camino para nuevos materiales NLO.
Área de la Ciencia:
- Ciencias de los materiales
- La cristalografía
- Optoelectrónica y sus derivados
Sus antecedentes:
- Las disposiciones centrosimétricas en materiales ópticos orgánicos no lineales (NLO) de estado sólido dificultan las aplicaciones de segunda generación armónica (SHG).
- El control del empaque molecular es crucial para superar las limitaciones en el rendimiento del material NLO.
Objetivo del estudio:
- Para utilizar el pilar[5]areno como anfitrión para encapsular moléculas de NLO y manipular sus arreglos de estado sólido.
- Investigar el impacto de la complejación huésped-huésped en la naturaleza centrosimétrica y la actividad SHG de los materiales NLO.
- Desarrollar un método eficiente para la preparación de estos nuevos materiales compuestos NLO.
Principales métodos:
- Encapsulación de moléculas de NLO (OM, DAST, MNS) dentro de un pilar[5]areno (BrP5) anfitrión.
- Formación de complejos anfitrión-invitado 2: 1 y 1: 1.
- Caracterización de las estructuras cristalinas y las propiedades NLO (SHG).
- Desarrollo de una técnica de cristalización inducida por ultrasonido.
Principales resultados:
- Las arenas pilares formaron arquitecturas de nanocápsulas con huéspedes NLO, lo que resultó en estructuras cristalinas centrosimétricas generales.
- La orientación aleatoria de OM y DAST en complejos 2: 1 rompió la centrosimetría local, produciendo un fuerte SHG.
- La orientación ordenada de MNS en complejos 1: 1 mantuvo la centrosimetría, lo que condujo a la SHG apagada.
- La cristalización inducida por ultrasonido permitió la preparación rápida de los materiales NLO.
Conclusiones:
- La complejación anfitrión-invitado con el pilar[5]areno controla efectivamente el embalaje en estado sólido y las propiedades NLO de los materiales orgánicos.
- Esta estrategia ofrece una nueva vía para el diseño de materiales orgánicos NLO en estado sólido con SHG ajustable.
- Las aplicaciones potenciales incluyen láseres de alta potencia, interruptores ópticos y imágenes avanzadas.
Videos de Conceptos Relacionados
03:45Formation of Complex Ions
18.8K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
18.8K
02:58Crystal Field Theory - Octahedral Complexes
28.5K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
28.5K
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
47.6K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than...
47.6K
01:25Crystal Growth: Principles of Crystallization
5.7K
Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
5.7K
01:18Aromatic Hydrocarbon Cations: Structural Overview
3.5K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
Removing one hydrogen from the intervening CH2 group...
3.5K
01:09Colloidal precipitates
5.7K
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
5.7K