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Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
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Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
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Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
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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,...
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Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines.
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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...
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Las superredes de intercalación molecular quiral

Qi Qian1, Huaying Ren1, Jingyuan Zhou1

  • 1Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, USA.

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Resumen

La selectividad de espín inducida por quiral (CISS) es avanzada por las nuevas superredes de intercalación molecular quiral (CMIS). Estos materiales robustos permiten nuevos dispositivos espintrónicos con alta polarización de espín y magnetorresistencia, superando las limitaciones anteriores.

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Área de la Ciencia:

  • Spintronics y Ciencias de los Materiales
  • Física de la materia condensada

Sus antecedentes:

  • La selectividad de espín inducida por quiral (CISS) ofrece manipulación de espín sin campo magnético para la espíntrónica.
  • Los materiales CISS existentes a menudo sufren de inhomogeneidad, baja selectividad y poca estabilidad, lo que dificulta las aplicaciones del dispositivo.

Objetivo del estudio:

  • Introducir una nueva clase de materiales quirales robustos en estado sólido, las superrejillas de intercalación molecular quiral (CMIS), para explorar el CISS.
  • Demostrar el potencial del CMIS en la creación de dispositivos espintrónicos de alto rendimiento.

Principales métodos:

  • Fabricación de CMIS mediante la intercalación de cristales atómicos bidimensionales en capas (2DAC) con moléculas quirales.
  • Caracterización mediante difracción de rayos X, microscopía electrónica de transmisión y dicroísmo circular.
  • Fabricación y caracterización de uniones de túneles de espín selectivo utilizando CMIS como capa de filtrado de espín.

Principales resultados:

  • Se confirmaron estructuras de superred altamente ordenadas de capas moleculares 2DAC y quirales alternadas.
  • Se observaron señales claras de dicroísmo circular dependientes de la quiralidad.
  • Las uniones de túneles de espín selectivo exhibieron una alta magnetorresistencia de túneles (> 300%) y una polarización de espín (> 60%) con una clara dependencia de la quiralidad.

Conclusiones:

  • El CMIS proporciona una plataforma robusta y versátil para investigar el CISS.
  • Las propiedades electrónicas sintonizables de los 2DAC y diversas moléculas quirales ofrecen una rica familia de materiales quirales artificiales.
  • CMIS tiene un potencial significativo para el desarrollo de dispositivos espintrónicos de próxima generación.