Video Experimental Relacionado
Updated: Jul 16, 2026
13:42
Solid-phase Submonomer Synthesis of Peptoid Polymers and their Self-Assembly into Highly-Ordered Nanosheets
Published on: November 2, 2011
Isomerismo supramolecular en compuestos de coordinación: hexágonos y cadenas moleculares a nanoescala
Heba Abourahma1, Brian Moulton, Victor Kravtsov
1Department of Chemistry, University of South Florida, 4202 East Fowler Avenue (SCA400), Tampa 33620, USA.
Journal of the American Chemical Society
|August 22, 2002
Resumen
Los investigadores crearon un hexágono supramolecular a nanoescala y una estructura de cadena isomérica utilizando el autoensamblaje. Estas estructuras, formadas por iones 5-NO2-bdc y cobre (II), ofrecen nuevas posibilidades en la investigación de nanomateriales.
Área de la Ciencia:
- Química supramolecular de las moléculas.
- Ciencia de los nanomateriales Ciencia de los nanomateriales.
Sus antecedentes:
- El autoensamblaje es una estrategia clave para crear arquitecturas complejas a nanoescala.
- Las estructuras metal-orgánicas (MOF) y los polímeros de coordinación ofrecen diversas posibilidades estructurales.
Objetivo del estudio:
- Sintetizar y caracterizar un nuevo hexágono supramolecular a nanoescala y su estructura de cadena isomérica.
- Para explorar el comportamiento de autoensamblaje del 5-NO2-bdc con los cationes Cu (II).
Principales métodos:
- Autoensamblaje de 5-nitrodiaminobenzeno (5-NO2-bdc) y de los cationes de cobre (II).
- Caracterización de las estructuras supramoleculares resultantes utilizando técnicas analíticas apropiadas.
Principales resultados:
- Preparación exitosa de un hexágono supramolecular neutro y soluble a nanoescala (1) con un diámetro exterior de 3.1 nm y un diámetro interno de 0.8 nm.
- Aislamiento de una estructura de cadena isomérica supramolecular (2).
- Demostración de autoensamblaje controlado que conduce a distintas arquitecturas a nanoescala.
Conclusiones:
- El autoensamblaje de los iones 5-NO2-bdc y Cu (II) puede producir estructuras supramoleculares bien definidas a nanoescala.
- Las estructuras hexagonales y de cadena resultantes representan nuevos bloques de construcción para materiales avanzados.
- La naturaleza ajustable del autoensamblaje ofrece vías para diseñar arquitecturas moleculares complejas.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:18Molecular Shapes
Molecules have characteristic shapes that are crucial for their function. The arrangement of various electron groups around the central atom dictates their molecular geometry. Electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between the electron pairs by maximizing the distance between them. The valence electrons form either bonding pairs, located primarily between bonded atoms, or lone pairs.Two regions of electron density in a diatomic...
02:34Structural Isomerism
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
02:52Stereoisomerism
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
02:11Conformations of Cyclohexane
Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal tetrahedral value,...
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal tetrahedral value,...
02:30Stability of Substituted Cyclohexanes
This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
02:33Stereoisomerism of Cyclic Compounds
In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...