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Metal-Ligand Bonds

Metal-Ligand Bonds

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...

Bonding in Metals

Bonding in Metals

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”.

Metallic Solids

Metallic Solids

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....

Alkali Metals

Alkali Metals

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

Properties of Transition Metals

Properties of Transition Metals

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.

Levels of Organization

Levels of Organization

Biological organization is the classification of biological structures, ranging from atoms at the bottom of the hierarchy to the Earth's biosphere. Each level of the hierarchy represents an increase in complexity that builds upon the previous level.
Molecules Are Composed of Atoms, and Biomolecules Are Assembled from Molecules:
The most basic levels include atoms, molecules, and biomolecules. Atoms, the smallest unit of ordinary matter, are composed of a nucleus and electrons. Molecules...

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Marco metálico-orgánico bioinspirado para la captura de trazas de CO2

Caitlin E Bien¹, Kai K Chen², Szu-Chia Chien³

¹Department of Chemistry and Biochemistry , The Ohio State University , Columbus , Ohio 43210 , United States.

Journal of the American Chemical Society

|September 27, 2018

Resumen

Este estudio detalla un nuevo marco metálico-orgánico (MOF) modificado para capturar dióxido de carbono (CO2) de manera eficiente. El material, que presenta grupos de hidróxido de zinc, muestra excelentes capacidades de captura y regeneración de CO2 a temperaturas suaves.

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Área de la Ciencia:

Ciencias de los materiales
Química inorgánica
Nanotecnología

Sus antecedentes:

Las estructuras metálico-orgánicas (MOF) ofrecen propiedades sintonizables para la captura de gas.
Las enzimas de anidrasa carbónica son catalizadores de CO2 muy eficientes.
El desarrollo de materiales eficientes de captura de CO2 es crucial para la remediación ambiental.

Objetivo del estudio:

Para sintetizar un nuevo MOF con sitios activos que imitan la anhidrase carbónica.
Investigar el rendimiento del MOF para la captura de trazas de dióxido de carbono (CO2).
Explorar el mecanismo de fijación del CO2 dentro del MOF modificado.

Principales métodos:

Modificación post-sintética de un MOF de benzotriazolato de Zn mediante el intercambio de ligandos.
Activación térmica para generar grupos nucleófilos de Zn-OH.
Caracterización mediante espectroscopia IR y cálculos de la teoría funcional de la densidad (DFT).

Principales resultados:

Se sintetizó con éxito un MOF modificado, [Zn(ZnOH) 4 ((bibta) 3).
El MOF demostró un excelente rendimiento para la captura de trazas de CO2.
Se lograron temperaturas de regeneración suaves.
Los cálculos DFT y la espectroscopia IR aclararon el mecanismo de fijación de CO2 que involucra el enlace de Zn-OH/Zn-O2COH y hidrógeno.

Conclusiones:

El MOF modificado posintéticamente presenta una alta eficiencia para la captura de trazas de CO2.
El material es regenerable bajo condiciones suaves.
El enlace de hidrógeno entre racimos juega un papel clave en el mecanismo de fijación de CO2, mejorando el rendimiento de la captura.