Video Experimental Relacionado
Updated: Jan 26, 2026
04:09
Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics
Published on: August 30, 2024
777
Mecanóforos de benzoladerenos: síntesis, polimerización y transformación mecanoquímica
Jinghui Yang1, Maggie Horst1, Joseph A H Romaniuk1
1Department of Chemistry , Stanford University , Stanford , California 94305 , United States.
Journal of the American Chemical Society
|April 11, 2019
Resumen
Los nuevos monómeros de benzoladerenos permiten la síntesis escalable de polímeros que se transforman en materiales conjugados a través de la fuerza mecánica. Este enfoque mecanoquímico ofrece una ruta más fácil para nuevos polímeros conjugados más allá del poliacetileno.
Área de la Ciencia:
- Química de los polímeros
- Ciencias de los materiales
- Mecanoquímica
Sus antecedentes:
- El poliladereno, un polimecanóforo, se reorganiza bajo la fuerza mecánica para formar poliacetileno semiconductor.
- El desarrollo de nuevos sistemas de mecanóforos es crucial para crear materiales sensibles a la fuerza.
Objetivo del estudio:
- Para reportar la síntesis escalable de nuevos monómeros de benzoladerenos.
- Investigar la polimerización y la transformación mecanoquímica de estos nuevos monómeros.
- Para generar polímeros conjugados más allá del poliacetileno utilizando un enfoque mecanoquímico.
Principales métodos:
- Síntesis escalable de los monómeros del benzoladdereno.
- La polimerización por metástasis de apertura de anillo (ROMP) para producir homopolímeros y copolímeros de bloqueo.
- Transformación mecanoquímica mediante sonorización para inducir el reordenamiento de enlaces.
Principales resultados:
- El éxito de la síntesis escalable de benzoladerenos.
- Síntesis controlada de poli (benzoladerenos) homopolímeros y copolímeros de bloque con baja dispersión.
- Transformación mecanoquímica de poli (benzoladereno) no conjugado en poli (o-fenileno-hexatrieno) conjugado con una conversión de hasta el 45%.
- Demostración de una vía de síntesis más accesible en comparación con los sistemas anteriores.
Conclusiones:
- Los benzoladerenos representan una nueva clase de monómeros mecanóforos con una accesibilidad sintética mejorada.
- La transformación mecanoquímica proporciona un método eficiente para generar polímeros conjugados.
- Este trabajo amplía el alcance de los polímeros conjugados generados mecanoquímicamente más allá del poliacetileno.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:33Bacterial Transformation
59.5K
In 1928, bacteriologist Frederick Griffith worked on a vaccine for pneumonia, which is caused by Streptococcus pneumoniae bacteria. Griffith studied two pneumonia strains in mice: one pathogenic and one non-pathogenic. Only the pathogenic strain killed host mice.
Griffith made an unexpected discovery when he killed the pathogenic strain and mixed its remains with the live, non-pathogenic strain. Not only did the mixture kill host mice, but it also contained living pathogenic bacteria that...
Griffith made an unexpected discovery when he killed the pathogenic strain and mixed its remains with the live, non-pathogenic strain. Not only did the mixture kill host mice, but it also contained living pathogenic bacteria that...
59.5K
01:16Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)
3.1K
Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
3.1K
01:42Actin Polymerization
8.4K
Actin polymerization occurs through the head-to-tail association of binding sites on monomeric actin or G-actin to form filamentous or F-actin. The polymerization can be divided into three phases ̶ nucleation, elongation, and steady-state phase.
The nucleation phase involves forming a stable nucleus consisting of three actin monomers to form a new actin filament. Actin-binding proteins such as formins and Arp2/3 complex help filament growth post-nucleation. The Formins form straight...
The nucleation phase involves forming a stable nucleus consisting of three actin monomers to form a new actin filament. Actin-binding proteins such as formins and Arp2/3 complex help filament growth post-nucleation. The Formins form straight...
8.4K
01:15Dehydration Synthesis
149.2K
Overview
Dehydration synthesis (also called a condensation reaction) is the chemical process in which two molecules covalently link together to form a new molecule, along with the release of a water molecule. Many physiologically important compounds form by dehydration synthesis reactions, such as complex carbohydrates, proteins, DNA, and RNA.
Synthesis of carbohydrates
Sugar molecules are covalently linked together by dehydration synthesis. During the reaction, the hydroxyl (-OH) group from...
Dehydration synthesis (also called a condensation reaction) is the chemical process in which two molecules covalently link together to form a new molecule, along with the release of a water molecule. Many physiologically important compounds form by dehydration synthesis reactions, such as complex carbohydrates, proteins, DNA, and RNA.
Synthesis of carbohydrates
Sugar molecules are covalently linked together by dehydration synthesis. During the reaction, the hydroxyl (-OH) group from...
149.2K
01:26Transformation
808
Microbial communities are dynamic environments where cell lysis releases free DNA into the surroundings. Other cells can take up this extracellular DNA through a process known as transformation.When a cell incorporates this foreign DNA into its genome, resulting in genetic modification, the process is known as transformation. Cells capable of this process are termed competent. Competence can be natural, as observed in certain bacteria and archaea, or artificially induced in the...
808
01:26Transformers
1.8K
A device that transforms voltages from one value to another using induction is called a transformer. A transformer consists of two separate coils, or windings, wrapped around the same soft iron core. However, they are electrically insulated from each other.
The iron core has a substantial relative permeability. Therefore, the magnetic field lines generated due to the current in one winding are almost entirely confined within the core, such that the same magnetic flux permeates each turn of both...
The iron core has a substantial relative permeability. Therefore, the magnetic field lines generated due to the current in one winding are almost entirely confined within the core, such that the same magnetic flux permeates each turn of both...
1.8K