Video Experimental Relacionado
Updated: Nov 26, 2025
06:53
Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
2.3K
Conductividad eléctrica dependiente de la valencia en un marco metálico-orgánico basado en tetrahidroxiquinona 3D
Gan Chen1, Leland B Gee2, Wenqian Xu3
1Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States.
Journal of the American Chemical Society
|December 14, 2020
Resumen
Los investigadores desarrollaron FeTHQ, un nuevo marco metal-orgánico conductor en 3D (cMOF). Este material muestra una alta conductividad eléctrica, ofreciendo potencial para aplicaciones de almacenamiento y catálisis de energía.
Área de la Ciencia:
- Ciencias de los materiales
- La electroquímica
- Nanotecnología
Sus antecedentes:
- Las estructuras metal-orgánicas eléctricamente conductoras (cMOF) son cruciales para el almacenamiento de energía, la catálisis y la detección.
- Los cMOF tridimensionales (3D) son menos comunes que sus contrapartes 2D.
Objetivo del estudio:
- Para sintetizar y caracterizar un nuevo cMOF 3D.
- Investigar la conductividad eléctrica y su dependencia del estado de valencia.
Principales métodos:
- Síntesis de FeTHQ mediante el uso de tetrahidroxi-1,4-quinona (THQ) y sulfato de hierro.
- Medición de la conductividad eléctrica a 300 K.
- Comparación de la conductividad en estado preparado, oxidado por aire y reducido.
Principales resultados:
- FeTHQ, un cMOF 3D, fue sintetizado con éxito.
- El material tiene una alta conductividad de 3,3 ± 0,55 mS cm-1 a 300 K.
- La conductividad depende del estado de valencia del FeTHQ, con una mayor conductividad en la forma preparada.
Conclusiones:
- El FeTHQ representa un prometedor cMOF 3D con una conductividad eléctrica significativa.
- La conductividad dependiente de la valencia ofrece oportunidades para propiedades electrónicas sintonizables.
- Este descubrimiento avanza en el desarrollo de cMOFs 3D para aplicaciones avanzadas.
Videos de Conceptos Relacionados
02:42Valence Bond Theory
10.3K
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...
10.3K
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
46.4K
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 the dxy,...
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 the dxy,...
46.4K
02:58Crystal Field Theory - Octahedral Complexes
29.2K
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...
29.2K
02:51Metal-Ligand Bonds
22.9K
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...
22.9K
02:42Ionic Crystal Structures
16.2K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
16.2K
03:45Formation of Complex Ions
24.9K
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...
24.9K