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Related Concept Videos

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.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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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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Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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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.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. 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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π Molecular Orbitals of 1,3-Butadiene01:24

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Conjugated dienes have lower heats of hydrogenation than cumulated and isolated dienes, making them more stable. The enhanced stabilization of conjugated systems can be understood from their π molecular orbitals.
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Double Resonance Techniques: Overview01:12

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Tuning intermolecular π-π stacking by isomeric engineering in single-molecule junctions.

Junrui Zhang1, Chao Chen2, Xianjing Xie1

  • 1School of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University, Hangzhou, 310018, P. R. China. xliu350@zstu.edu.cn.

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Understanding molecular stacking is key for new organic semiconductors. This study links charge polarization to stacking ability, guiding the design of advanced materials with tunable interactions.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Supramolecular Chemistry

Background:

  • Intermolecular π-π stacking is crucial for organic semiconductor and optoelectronic device performance.
  • Tailoring molecular structures is essential for controlling material properties.

Purpose of the Study:

  • To investigate the relationship between molecular structure and intermolecular π-π stacking effects.
  • To explore charge transport properties influenced by stacking in engineered molecular wires.
  • To establish a foundation for designing advanced materials with tunable intermolecular interactions.

Main Methods:

  • Engineering molecular wires with pyridine, thiazole, and thiophene units.
  • Utilizing single-molecule scanning tunnelling microscopy-break junction (STM-BJ) technique.
  • Conducting single-molecule conductance measurements, flicker noise analysis, and current-voltage (I-V) studies.
  • Integrating theoretical analyses to elucidate stacking mechanisms.

Main Results:

  • Demonstrated a direct correlation between intramolecular charge polarization and stacking capability.
  • Elucidated the mechanism for manipulating intermolecular π-π stacking at the microscale.
  • Established a structure-property relationship between charge polarization and stacking-driven charge transport.

Conclusions:

  • Intramolecular charge polarization is a key factor governing intermolecular π-π stacking.
  • The findings provide a pathway for designing organic materials with enhanced charge transport properties.
  • This research advances the understanding of molecular interactions for novel electronic and optoelectronic applications.