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Related Concept Videos

Chirality02:25

Chirality

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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 with Multiple Chiral Centers02:25

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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 at Nitrogen, Phosphorus, and Sulfur02:30

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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.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
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Stereoisomerism of Cyclic Compounds02:33

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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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Fischer Projections02:18

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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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Stereoisomerism02:52

Stereoisomerism

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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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Chiral molecular intercalation superlattices.

Qi Qian1, Huaying Ren1, Jingyuan Zhou1

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

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Chiral-induced spin selectivity (CISS) is advanced by new chiral molecular intercalation superlattices (CMIS). These robust materials enable new spintronic devices with high spin polarization and magnetoresistance, overcoming previous limitations.

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Area of Science:

  • Spintronics and Materials Science
  • Condensed Matter Physics

Background:

  • Chiral-induced spin selectivity (CISS) offers magnetic-field-free spin manipulation for spintronics.
  • Existing CISS materials often suffer from inhomogeneity, low selectivity, and poor stability, hindering device applications.

Purpose of the Study:

  • To introduce a new class of robust solid-state chiral materials, chiral molecular intercalation superlattices (CMIS), for exploring CISS.
  • To demonstrate the potential of CMIS in creating high-performance spintronic devices.

Main Methods:

  • Fabrication of CMIS by intercalating layered two-dimensional atomic crystals (2DACs) with chiral molecules.
  • Characterization using X-ray diffraction, transmission electron microscopy, and circular dichroism.
  • Fabrication and characterization of spin-selective tunneling junctions using CMIS as the spin-filtering layer.

Main Results:

  • Highly ordered superlattice structures of alternating 2DAC and chiral molecular layers were confirmed.
  • Clear chirality-dependent circular dichroism signals were observed.
  • Spin-selective tunneling junctions exhibited high tunnelling magnetoresistance (>300%) and spin polarization (>60%) with distinct chirality dependence.

Conclusions:

  • CMIS provide a robust and versatile platform for investigating CISS.
  • The tunable electronic properties of 2DACs and diverse chiral molecules offer a rich family of artificial chiral materials.
  • CMIS hold significant potential for developing next-generation spintronic devices.