Video Experimental Relacionado
Updated: Mar 27, 2026
12:30
Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
Published on: April 9, 2018
9.7K
Comportamiento vapocrómico de un ciclo metálico supramolecular en forma de silla con ultraestabilidad
Bo Jiang, Jing Zhang, Jian-Qiu Ma1
1Department of Chemistry, Beijing Normal University , Beijing 100050, P. R. China.
Journal of the American Chemical Society
|January 8, 2016
Resumen
Un nuevo ciclo metálico muestra un cambio de color reversible al exponerse al vapor de diclorometano o al molienda. Este material estable exhibe una ultra estabilidad, conservando su color rojo durante meses debido a un apilamiento molecular único.
Área de la Ciencia:
- Química supramolecular
- Ciencias de los materiales
- Química de coordinación
Sus antecedentes:
- Los materiales vapocrómicos cambian de color en respuesta a estímulos externos como los vapores.
- El desarrollo de sistemas vapocrómicos estables es crucial para las aplicaciones prácticas.
- Los metaciclos ofrecen propiedades estructurales y electrónicas únicas para materiales funcionales.
Objetivo del estudio:
- Para sintetizar y caracterizar un nuevo ciclo supramolecular discreto.
- Para investigar sus propiedades vapocrómicas y su estabilidad.
- Para aclarar la base estructural para su mayor estabilidad.
Principales métodos:
- Autoensamblaje impulsado por la coordinación para la síntesis del ciclo metálico.
- Análisis colorimétrico en estado sólido desencadenado por vapor de diclorometano (CH2Cl2) y molienda mecánica.
- Prueba de estabilidad a largo plazo en condiciones ambientales, aire y vacío.
- Análisis estructural para entender el empaque molecular y las interacciones.
Principales resultados:
- Se preparó con éxito un ciclo metálico supramolecular discreto funcionalizado con una fracción de bzimpy de alquinilplatino.
- El ciclo metálico exhibió un cambio de color reversible en estado sólido de amarillo a rojo tras la exposición al vapor de CH2Cl2 o a la molienda mecánica.
- El material demostró una estabilidad excepcional, manteniendo su color rojo durante meses en el aire y más de una semana bajo vacío.
- La conformación de la silla del ciclo metálico facilitó el apilamiento molecular cercano a través de las interacciones Pt·Pt y π-π, lo que contribuyó a su ultraestabilidad.
Conclusiones:
- Se ha desarrollado un ciclo metálico vapocrómico altamente estable.
- La ultraestabilidad observada se atribuye a la conformación molecular específica y las interacciones intermoleculares.
- Este trabajo proporciona información sobre el diseño de materiales vapocrómicos robustos para posibles aplicaciones de detección.
Más Videos Relacionados
07:14Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
Published on: May 12, 2023
3.9K
09:45Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
Published on: March 20, 2017
10.9K
Videos de Conceptos Relacionados
02:02Chair Conformation of Cyclohexane
21.3K
The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this...
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this...
21.3K
01:19Complexation Equilibria: The Chelate Effect
1.5K
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
1.5K
02:42Valence Bond Theory
11.6K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.6K
03:02Colors and Magnetism
14.6K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
14.6K
02:51Metal-Ligand Bonds
25.6K
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...
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...
25.6K
![[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2Ffiles%2Fmedia%2Fscience-education%2Fscience-education-thumbs%2F12422.jpg&w=3840&q=75)
01:21[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement
3.6K
The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
3.6K