Video Experimental Relacionado

Updated: May 28, 2026

Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging

Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging

Published on: July 21, 2011

Un imán de iones únicos de lantánido sándwich organometálico con un inusual mecanismo de relajación múltiple

Matthew Jeletic¹, Po-Heng Lin, Jennifer J Le Roy

¹Chemistry Department and the Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie, Ottawa, ON, Canada K1N 6N5.

Journal of the American Chemical Society

|October 29, 2011

Resumen

Se sintetizó un nuevo complejo sándwich de disprosio (III) y se demostró el comportamiento del imán de iones individuales. Sus vías de relajación magnética mostraron modos múltiples inusuales, altamente dependientes de los campos de corriente continua estática aplicados.

Área de la Ciencia:

Química organometálica Química orgánica de los metales.
Ciencia de los materiales Ciencia de los materiales.
El magnetismo es el magnetismo.

Sus antecedentes:

Los imanes de iones individuales (SIM) son cruciales para el desarrollo de materiales magnéticos moleculares.
Los complejos de disprosio (III) ofrecen potencial para una alta anisotropía magnética.
El control de la dinámica de relajación en las SIM es clave para las aplicaciones.

Objetivo del estudio:

Para sintetizar y caracterizar un nuevo complejo sándwich de disprosio ((III).
Para investigar las propiedades magnéticas, específicamente el comportamiento de los imanes de iones únicos.
Para explorar las dinámicas de relajación y su dependencia de los campos magnéticos externos.

Principales métodos:

Síntesis del complejo sándwich de disprosio (III) [Dy (III) (COT) ] Li (THF) (DME) ] utilizando el 1,4-bis (trimetilsilil) ciclooctatetraenil dianio (COT).
Mediciones de la susceptibilidad magnética.
Análisis de la dinámica de relajación bajo campos de corriente continua (cd) estática variable.

Principales resultados:

Síntesis exitosa del complejo sándwich de disprosio (III).
El complejo exhibe un comportamiento de imán de iones individuales.
Se observaron modos inusuales de relajación magnética múltiple.
Se descubrió que las vías de relajación son fuertemente dependientes de los campos de CC estáticos aplicados.

Conclusiones:

El complejo de disprosio sintetizado (III) es un prometedor imán de iones únicos.
El complejo muestra complejas dinámicas de relajación influenciadas por campos externos.
Se necesitan más estudios sobre la relajación dependiente del campo en las SIM de lantánidos.

Más Videos Relacionados

Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals

Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals

Published on: April 14, 2020

Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies

Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies

Published on: January 3, 2018

Videos de Conceptos Relacionados

Valence Bond Theory

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

Colors and Magnetism

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.

Atomic Nuclei: Nuclear Relaxation Processes

Atomic Nuclei: Nuclear Relaxation Processes

In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis. This...

Atomic Nuclei: Types of Nuclear Relaxation

Atomic Nuclei: Types of Nuclear Relaxation

Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers energy to a nearby...

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: 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...