Video Experimental Relacionado
Updated: Feb 16, 2026
07:24
Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
Published on: April 14, 2020
18.7K
Hierro de cruce de espín ((II) Polímero de coordinación con propiedades fluorescentes: correlación entre las
Charles Lochenie1, Konstantin Schötz2, Fabian Panzer2
1Inorganic Chemistry II, Universität Bayreuth , Universitätsstrasse 30, NW I, 95440 Bayreuth, Germany.
Journal of the American Chemical Society
|December 19, 2017
Resumen
Este estudio presenta un nuevo polímero de coordinación de cruce de espín con un amplio bucle de histeresis térmica por encima de la temperatura ambiente. Este material
Área de la Ciencia:
- Química de la coordinación
- Ciencias de los materiales
- Química supramolecular
Sus antecedentes:
- Los materiales de cruce de espín (SCO) son prometedores para interruptores moleculares y dispositivos de memoria.
- El diseño de materiales SCO con amplia histeresis térmica es crucial para las aplicaciones prácticas.
- Los polímeros de coordinación ofrecen estructuras sintonizables para los fenómenos SCO.
Objetivo del estudio:
- Sintetizar y caracterizar un nuevo polímero de coordinación de cruce de espín.
- Investigar la histeresis térmica y las propiedades estructurales del material.
- Explorar el potencial del uso de la luminiscencia para la detección de SCO.
Principales métodos:
- Síntesis del polímero de coordinación [Fe(L1) ((bipy) ]n.
- Mediciones magnéticas, espectroscopia de Mössbauer y DSC para la caracterización de la transición de espín.
- Difracción de polvo de rayos X dependiente de la temperatura para el análisis estructural.
Principales resultados:
- El polímero de coordinación exhibe un bucle de histeresis térmica de 48 K de ancho por encima de la temperatura ambiente, estable durante varios ciclos.
- Una transición de fase estructural está acoplada con la transición de espín.
- Las propiedades de luminiscencia cambian de verde a amarillo con la transición de giro, lo que permite el seguimiento óptico.
Conclusiones:
- El polímero de coordinación sintetizado demuestra un comportamiento de cruce de espín robusto con potencial para aplicaciones bistables.
- Las transiciones estructurales y de giro acopladas ofrecen información sobre los mecanismos de la OCS.
- La detección basada en la luminiscencia proporciona un método no invasivo para monitorear las transiciones de giro.
Más Videos Relacionados
06:53Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
2.7K
07:11ARL Spectral Fitting as an Application to Augment Spectral Data via Franck-Condon Lineshape Analysis and Color Analysis
Published on: August 19, 2021
3.0K
Videos de Conceptos Relacionados
03:02Colors and Magnetism
14.2K
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...
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...
14.2K
01:26Variables Affecting Phosphorescence and Fluorescence
1.5K
Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
1.5K
02:42Valence Bond Theory
11.4K
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...
11.4K
01:23Photoluminescence: Fluorescence and Phosphorescence
4.0K
Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
A pair of electrons in a...
4.0K
02:52Stereoisomerism
14.1K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
14.1K
02:58Properties of Transition Metals
30.1K
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.
30.1K