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Videos de Conceptos Relacionados

Stereoisomerism02:52

Stereoisomerism

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...
Disubstituted Cyclohexanes: cis-trans Isomerism02:37

Disubstituted Cyclohexanes: cis-trans Isomerism

Depending upon the different spatial orientation of the substituents, the disubstituted cycloalkanes exhibit two types of stereoisomers. The cis isomers have the substituents on the same side of the ring, whereas the trans isomers have the substituents on the opposite sides. These stereoisomers exhibit different physical properties and cannot be interconverted without breaking the carbon-carbon bonds.
In cyclohexane, the substituents can occupy different positions generating distinct isomers.
Stereoisomers02:32

Stereoisomers

On the basis of mirror symmetry, stereoisomers of an organic molecule can be further classified into diastereomers and enantiomers. Diastereomers are stereoisomers that are not mirror images of each other. Substituted alkenes, such as the cis and trans isomers of 2-butene, are diastereomers, as these molecules exhibit different spatial orientations of their constituent atoms, are not mirror images of each other, and do not interconvert. Here, the interconversion is suppressed due to restricted...
Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
Structural Isomerism02:34

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.

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Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-(phosphinetriyl)tripiperidine]}palladium Under Mild Reaction Conditions
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Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-(phosphinetriyl)tripiperidine]}palladium Under Mild Reaction Conditions

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Una lanzadera molecular con complejo de paladio conmutable y sus isómeros posicionales metastables.

James D Crowley1, David A Leigh, Paul J Lusby

  • 1School of Chemistry, University of Edinburgh, The King's Buildings, West Mains Road, Edinburgh EH9 3JJ, United Kingdom.

Journal of the American Chemical Society
|November 10, 2007
PubMed
Resumen

Los investigadores diseñaron un nuevo [2]rotaxano con un macrociclo complejo de paladio. Este macrociclo se puede mover con precisión entre diferentes sitios de ligandos utilizando protonación reversible, lo que permite interruptores moleculares controlados.

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Área de la Ciencia:

  • Química supramolecular de las moléculas.
  • Coordinación Química de la Coordinación
  • Ciencia de los materiales Ciencia de los materiales.

Sus antecedentes:

  • El desarrollo de máquinas moleculares requiere un control preciso sobre el movimiento de los componentes.
  • Los rotaxanos son candidatos prometedores para la maquinaria molecular debido a sus estructuras mecánicamente entrelazadas.
  • Los complejos de coordinación de paladio ofrecen propiedades electrónicas y catalíticas únicas para dispositivos moleculares.

Objetivo del estudio:

  • Diseñar y sintetizar un [2]rotaxano con un macrociclo translocable complejo de paladio.
  • Para investigar el control de la posición del macrociclo utilizando la protonación reversible de los sitios de ligando.
  • Para caracterizar los diferentes estados de co-conformistas del sistema rotaxano.

Principales métodos:

  • Síntesis del [2]rotaxano que incorpora un macrociclo de paladio y sitios específicos de ligando (4-dimetilaminopiridina y piridina).
  • Caracterización utilizando técnicas espectroscópicas (por ejemplo, RMN) para confirmar la estructura y la pureza.
  • Estudios operativos que involucran protonación/deprotonación controlada para inducir y monitorear la translocación del macrociclo.

Principales resultados:

  • Síntesis y caracterización exitosas del objetivo [2]rotaxane.
  • Demostración de la translocación reversible del macrociclo complejo de paladio entre los sitios de ligando a través de la protonación.
  • Identificación y aislamiento de cuatro estados de coconformidad distintos (protonado/neutro, estable/metastable) bajo condiciones ambientales.

Conclusiones:

  • El rotaxano diseñado [2] funciona como un interruptor molecular controlable.
  • La protonación reversible proporciona un estímulo externo viable para el movimiento del macrociclo.
  • El sistema permite la selección y manipulación de estados específicos de co-conformistas, allanando el camino para dispositivos moleculares avanzados.