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¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

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A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
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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.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
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Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

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Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
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Single-Molecule F&#246;rster Resonance Energy Transfer Methods for Real-Time Investigation of the Holliday Junction Resolution by GEN1
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Constructing Dual-Molecule Junctions to Probe Intermolecular Crosstalk.

Xiao-Hui Wu1, Fang Chen2, Feng Yan1

  • 1Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, China.

ACS Applied Materials & Interfaces
|June 16, 2020
PubMed
Summary

Charge transport in dual-molecule junctions reveals intermolecular crosstalk effects. This study provides key insights for designing future molecular electronic components by understanding molecular interactions.

Keywords:
STM-BJdual-molecule junctionnoncovalent interactionsquantum transport simulationsupramolecular complex

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Area of Science:

  • Molecular electronics
  • Quantum transport phenomena
  • Nanoscale electronic devices

Background:

  • Future electronic components will rely on multimolecular systems.
  • Understanding charge transport in molecular ensembles is crucial.
  • Dual-molecule junctions offer a platform to study intermolecular effects.

Purpose of the Study:

  • To fabricate and investigate dual-molecule junction devices.
  • To elucidate the impact of intermolecular crosstalk on electronic transport.
  • To compare dual-molecule junctions with single-molecule junctions.

Main Methods:

  • Fabrication of scanning tunneling microscopy (STM) dual-molecule junction devices.
  • Utilizing noncovalent interactions for junction formation.
  • Performing STM-break junction (BJ) measurements and quantum transport simulations.

Main Results:

  • A 10% decrease in conductance per molecule was observed from dual- to single-molecule junctions.
  • Intermolecular crosstalk, specifically π-π interactions, was identified as the cause.
  • Substrate-mediated coupling may also contribute to the observed conductance changes.

Conclusions:

  • This study presents the first experimental evidence of intermolecular crosstalk in STM-BJ electronic transport.
  • The findings enhance fundamental knowledge of molecular interactions in electronic transport.
  • The approach is relevant for designing future multimolecular electronic components and dual-molecular systems.