Video Experimental Relacionado
Updated: May 6, 2026
10:42
Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
Published on: December 29, 2016
10.1K
Equilibrios inusuales que involucran amidas del grupo 4, complejos sililo y aniones sililo a través de reacciones de
Xianghua Yu1, Hu Cai, Ilia A Guzei
1Department of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996-1600, USA.
Journal of the American Chemical Society
|April 9, 2004
Resumen
Los aniones sililo pueden sustituir a los ligandos de amida en los complejos de zirconio, formando nuevos complejos sililo. Estas reacciones de intercambio de ligandos son reversibles y termodinámicamente favorecidas, ofreciendo información sobre la química organometálica.
Área de la Ciencia:
- Química organometálica Química orgánica de los metales.
- Química Inorgánica La Química Inorgánica es la química inorgánica.
Sus antecedentes:
- Los complejos de amida de zirconio son precursores versátiles en la síntesis organometálica.
- Los aniones sililo son nucleófilos potentes con reactividad diversa.
Objetivo del estudio:
- Para investigar las reacciones de sustitución de ligandos entre aniones sililo y complejos de amida de zirconio.
- Para dilucidar la termodinámica y los mecanismos de estos equilibrios reversibles de intercambio de ligandos.
Principales métodos:
- Reacción del anión sililo (SiButPh2-) con los complejos de amida de zirconio (Zr(NMe2)4 y Zr(NMe2)3[N(SiMe3)2]).
- Estudios termodinámicos (entalpia, entropía y energía libre de Gibbs) de los equilibrios observados.
- Análisis de las vías de intercambio de ligandos.
Principales resultados:
- El anión sililo SiButPh2- sustituyó con éxito ligandos amidales en complejos de circonio, formando complejos disililo.
- Se encontró que las reacciones de intercambio de ligandos eran reversibles, estableciendo equilibrios distintos.
- Los datos termodinámicos indicaron que los cambios de entalpía favorecían las reacciones de sustitución hacia adelante, haciendo que la formación del complejo disilyl fuera termodinámicamente favorable.
Conclusiones:
- Los aniones sililo son nucleófilos efectivos para la sustitución de los ligandos amídicos en los complejos de zirconio.
- Los equilibrios de intercambio de ligandos observados se rigen por cambios de entalpía favorables.
- Este estudio proporciona una comprensión termodinámica del intercambio de ligandos de silil-amida en la química del organozirconio.
Más Videos Relacionados
06:44From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
71.2K
11:04Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
Published on: September 7, 2019
8.3K
Videos de Conceptos Relacionados
02:48Ionic Bonding and Electron Transfer
46.7K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
46.7K
03:45Formation of Complex Ions
18.8K
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...
18.8K
02:51Metal-Ligand Bonds
19.3K
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...
19.3K
01:23Complexation Equilibria: Overview
1.6K
Complexation reactions take place when dative or coordinate covalent bonds form between metal ions and ligands. The compounds formed in these reactions are called coordination compounds. The number of bonds formed between the metal ion and the ligands is called its coordination number. Generally, most metal ions in an aqueous solution are solvated by water molecules and thus exist as aqua complexes.
The equilibrium constant of the complexation reaction is represented as the formation constant...
The equilibrium constant of the complexation reaction is represented as the formation constant...
1.6K
01:19Complexation Equilibria: The Chelate Effect
1.7K
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...
1.7K
01:09Complexation Equilibria: Factors Influencing Stability of Complexes
999
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...
999