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Related Concept Videos

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

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A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...
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¹H NMR: Long-Range Coupling01:27

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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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Spin–Spin Coupling Constant: Overview01:08

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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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.
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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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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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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
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Liquid-Phase Vibrational Strong Coupling.

Jino George, Atef Shalabney, James A Hutchison

    The Journal of Physical Chemistry Letters
    |August 12, 2015
    PubMed
    Summary
    This summary is machine-generated.

    Researchers explored light-matter strong coupling in liquid-phase molecules within microcavities. This study demonstrates tuning vibrational frequencies by coupling molecular bonds, advancing molecular and material sciences.

    Keywords:
    Rabi splittinglight-matter interactionliquidstrong couplingvibration

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    Area of Science:

    • Physical Chemistry
    • Molecular Spectroscopy
    • Materials Science

    Background:

    • Light-matter strong coupling typically studied in solid or gas phases.
    • Molecular vibrations are fundamental to chemical properties and reactivity.
    • Microcavities offer a platform for controlling light-matter interactions.

    Purpose of the Study:

    • To investigate light-matter strong coupling involving ground-state molecular vibrations in the liquid phase.
    • To explore the effects of tuning microcavities on vibrational modes.
    • To demonstrate parallel and series coupling of vibrational modes.

    Main Methods:

    • Utilized microcavities to confine molecules in the liquid phase.
    • Tuned microcavity properties to selectively couple vibrational modes.
    • Spectroscopic analysis to observe changes in vibrational frequencies.

    Main Results:

    • Achieved light-matter strong coupling with ground-state molecular vibrations in liquids.
    • Demonstrated that tuning microcavities alters vibrational frequencies.
    • Showcased the ability to couple one or more vibrational modes in parallel or series.

    Conclusions:

    • This work establishes liquid-phase strong coupling of molecular vibrations.
    • Findings are crucial for developing advanced applications in molecular and material sciences.
    • Control over vibrational frequencies via light-matter interaction opens new avenues for chemical control.