Video Experimental Relacionado
Updated: Feb 15, 2026
10:49
Planar and Three-Dimensional Printing of Conductive Inks
Published on: December 9, 2011
37.8K
Control de la estructura electrónica y la conductividad en estructuras metálicas semicinoides bidimensionales de
Michael E Ziebel1, Lucy E Darago1, Jeffrey R Long1,2,3
1Department of Chemistry, University of California , Berkeley, California 94720, United States.
Journal of the American Chemical Society
|February 6, 2018
Resumen
Las nuevas estructuras metal-orgánicas muestran una conductividad electrónica ajustable. El material a base de vanadio exhibe una alta conductividad debido a fuertes interacciones entre metales y ligandos, lo que ofrece información sobre los mecanismos de transporte de cargas.
Área de la Ciencia:
- Ciencias de los materiales
- Química del estado sólido
- Química de coordinación
Sus antecedentes:
- Los marcos metálico-orgánicos bidimensionales (MOF) se investigan por sus propiedades electrónicas.
- Se sintetizaron MOF isostruturales con diferentes centros metálicos (Ti, V, Cr) y ligandos (Cl2dhbq, dhbq).
Objetivo del estudio:
- Síntesis y caracterización de nuevos MOF isostruturales en 2D.
- Investigar la relación entre la estructura electrónica, la covalencia metal-ligando y la conductividad electrónica.
- Comprender los mecanismos de transporte de carga en los marcos de valencia mixta.
Principales métodos:
- Métodos espectroscópicos (UV frente a NIR, IR)
- Mediciones magnéticas
- Análisis electroquímico
- Cálculos de las órbitas moleculares
Principales resultados:
- Sintetizado (H2NMe2) 2M2 ((Cl2dhbq) 3 (M=Ti, V) y (H2NMe2) 1.5Cr2 ((dhbq) 3).
- Se observaron diferencias significativas en las estructuras y conductividades electrónicas.
- La fase de vanadio mostró una alta conductividad electrónica (0,45 S / cm) debido a la covalencia metal-ligando, el apagado de espín y los procesos redox simultáneos.
Conclusiones:
- La conductividad electrónica en estos MOF se correlaciona con la deslocalización electrónica.
- La alineación de energía metal-ligando y las transiciones de transferencia de carga de intervalo dictan las barreras de salto de carga.
- Los hallazgos proporcionan un marco para el diseño de MOF conductores.
Videos de Conceptos Relacionados
01:17Theory of Metallic Conduction
1.8K
The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
1.8K
02:58Properties of Transition Metals
30.1K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
30.1K
02:32Bonding in Metals
53.0K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.
53.0K
03:06Alkali Metals
25.0K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
Table 1: Properties of the alkali metals
25.0K
02:37Metallic Solids
20.9K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
20.9K
02:28Electronic Structure of Atoms
29.0K
An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum...
29.0K