Video Experimental Relacionado
Updated: Jun 25, 2026
10:52
Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
Published on: July 27, 2022
Hidricidades de d(6) complejos de hidruro de metal en el agua
1Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA. ccreutz@bnl.gov
Journal of the American Chemical Society
|February 10, 2009
Resumen
La hidricidad de d(6) complejos de hidruro metálico en el agua se determinó utilizando las propiedades redox y mediciones de acidez para el cobalto y el rodio, y el dióxido de carbono / equilibrio de iones de formato para el rutenio.
Área de la Ciencia:
- Química Inorgánica La Química Inorgánica es la química inorgánica.
- Química organometálica Química orgánica de los metales.
- Química de la Solución Química de la Solución
Sus antecedentes:
- Los complejos de hidruro metálico son cruciales en la catálisis y el almacenamiento de hidrógeno.
- Comprender su estabilidad en soluciones acuosas es vital para las aplicaciones prácticas.
- La hidricidad, una medida de la capacidad del donante de hidruro, es clave para la reactividad.
Objetivo del estudio:
- Para calcular y comparar las hidricidades de d(6) complejos de hidruro metálico en agua.
- Establecer métodos confiables para determinar la hidricidad para diferentes centros metálicos.
- Proporcionar datos fundamentales para el diseño de nuevos sistemas catalíticos.
Principales métodos:
- Cálculo de hidricidad para complejos de cobalto y rodio a través de propiedades redox y mediciones de acidez.
- Determinación de la hidricidad de los complejos de rutenio a través del equilibrio con dióxido de carbono/ión formato.
- Utilizando técnicas electroquímicas y basadas en el equilibrio en medios acuosos.
Principales resultados:
- Valores cuantificados de hidricidad para complejos específicos de hidruro de metal d(6).
- Demostró la aplicabilidad de diferentes métodos para varios centros metálicos.
- Proporcionó un análisis comparativo de las concentraciones donantes de hidruro en el agua.
Conclusiones:
- Metodologías establecidas para evaluar la hidricidad del complejo de hidruro metálico en el agua.
- Destacó la influencia de la identidad del metal en la capacidad del donante de hidruro.
- Generó datos esenciales para el avance de la catálisis homogénea y las tecnologías relacionadas con el hidrógeno.
Videos de Conceptos Relacionados
03:45Formation 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...
01:09Complexation 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...
01:20Aldehydes and Ketones with Water: Hydrate Formation
An oxygen-based nucleophile, like water, can undergo addition reactions with aldehydes and ketones. The reaction leads to the formation of hydrates, also referred to as 1,1-diols or geminal diols.
The formation of hydrates is a reversible reaction. Hydrate formation is influenced by steric and electronic factors accompanying the alkyl substituents on the carbonyl group: The rate of hydrate formation increases with a decrease in the number of alkyl groups attached to the carbonyl carbon. Hence,...
The formation of hydrates is a reversible reaction. Hydrate formation is influenced by steric and electronic factors accompanying the alkyl substituents on the carbonyl group: The rate of hydrate formation increases with a decrease in the number of alkyl groups attached to the carbonyl carbon. Hence,...
02:54Ions as Acids and Bases
Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
02:51Metal-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...
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...
01:22EDTA: Chemistry and Properties
Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...