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Related Concept Videos

Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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Cooperative Allosteric Transitions01:58

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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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Spin–Spin Coupling: One-Bond Coupling01:17

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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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Thermal Sigmatropic Reactions: Overview01:16

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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
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Engineering Structural Transitions in a Multilevel Molecular Switch via Intermolecular Coupling.

Yueqing Shi1, Zihao Wang1,2, Weike Quan1,2

  • 1Department of Chemistry, University of California, San Diego, La Jolla, California 92093-0358, United States.

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Researchers engineered a two-molecule system with six distinct states, surpassing expectations for molecular electronics. This breakthrough enables precise control over molecular behavior for advanced devices.

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Area of Science:

  • Molecular Electronics
  • Surface Science
  • Supramolecular Chemistry

Background:

  • Controlling molecular conformations is key for molecular electronics and understanding molecular dynamics.
  • Achieving multiple, addressable states in molecular systems is synthetically challenging.
  • Nature utilizes bistable molecular conformers, but synthetic systems lag in complexity.

Purpose of the Study:

  • To demonstrate a bottom-up strategy for creating multilevel functionality in molecular assemblies.
  • To investigate intermolecular interactions governing molecular conformations.
  • To establish a design principle for engineering collective molecular behavior.

Main Methods:

  • Utilizing low-temperature scanning tunneling microscopy (LT-STM) to observe molecular adsorption.
  • Analyzing pyrrolidine dimer adsorption on a Cu(100) surface.
  • Investigating the role of van der Waals forces and steric repulsion in conformational control.

Main Results:

  • A pyrrolidine dimer on Cu(100) exhibited six distinct adsorption conformations, exceeding the predicted four.
  • Intermolecular interactions reshaped the potential energy landscape, creating a sequential two-step switching pathway.
  • Low-energy inelastic electron excitations drove switching with high efficiency, an order of magnitude greater than monomers.
  • Deterministic control over multiple stable states was achieved by tuning bias voltage and tip-molecule distance.

Conclusions:

  • Intermolecular interactions can yield complex, multilevel functionality in simple molecular assemblies.
  • This work establishes a general design principle for on-demand engineering of collective molecular behavior.
  • The findings pave the way for energy-efficient multilevel molecular devices.