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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...

Complexation Equilibria: Factors Influencing Stability of Complexes

Complexation Equilibria: Factors Influencing Stability of Complexes

In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...

Complexation Equilibria: The Chelate Effect

Complexation Equilibria: The Chelate Effect

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...

Structural Isomerism

Structural 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...

Formation of Complex Ions

Formation of Complex Ions

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...

Properties of Organometallic Compounds

Properties of Organometallic Compounds

Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.

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Hg(II)...Pd(II) las interacciones metalofílicas

Mieock Kim¹, Thomas J Taylor, François P Gabbaï

¹Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA.

Journal of the American Chemical Society

|April 25, 2008

Resumen

Se forman nuevos complejos supramoleculares cuando el bis (pentafluorofenil) mercurio reacciona con los complejos de paladio (II). Estas estructuras cuentan con un sintón de mercurio emparentado con el paladio, lo que indica una nueva interacción metalófila Hg-Pd.

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Área de la Ciencia:

Química organometálica Química orgánica de los metales.
Química supramolecular de las moléculas.
Coordinación Química de la Coordinación

Sus antecedentes:

Los complejos de paladio (II) son versátiles bloques de construcción en la química de la coordinación.
Los compuestos de mercurio ofrecen propiedades electrónicas únicas para la formación de complejos.
Los ensamblajes supramoleculares permiten el diseño de nuevos materiales con propiedades a medida.

Objetivo del estudio:

Para sintetizar y caracterizar nuevos complejos supramoleculares que involucran mercurio y paladio.
Investigar la naturaleza de las interacciones entre los centros de mercurio y paladio en estos complejos.
Explorar el potencial de estos complejos en la ciencia de los materiales.

Principales métodos:

Reacción del bis (pentafluorofenilo) mercurio con los complejos [Pd (salopeno) ] y [Pd (N-C) (OAc) ]2.
Espectroscopia UV-vis para la observación en solución de la formación compleja.
Caracterización estructural completa de los complejos supramoleculares resultantes.

Principales resultados:

Formación de complejos supramoleculares [1-(I) 2] y [1-(II) 2] donde el mercurio es emparentado con el paladio.
Observación de distancias cortas Hg-Pd (3.2841(2) Å y 3.1065(8) Å).
La evidencia de las interacciones metalófilas Hg-Pd y las interacciones Pd{II}-->Hg{II} entre donante y receptor.

Conclusiones:

Síntesis exitosa de nuevos complejos supramoleculares de mercurio y paladio.
Confirmación de las significativas interacciones metalófilas Hg-Pd.
Estos hallazgos abren caminos para el diseño de nuevos materiales organometálicos.