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Related Concept Videos

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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When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
8.4K
¹H NMR: Complex Splitting01:13

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2.1K
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.
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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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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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Excited-State Proton Transfer in Solution under Vibrational Strong Coupling.

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Summary
This summary is machine-generated.

Vibrational strong coupling (VSC) significantly alters excited state proton transfer rates and dynamics in solution. This quantum effect influences chemical reactivity, extending beyond previously known ground state processes.

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Area of Science:

  • Physical Chemistry
  • Quantum Chemistry
  • Chemical Dynamics

Background:

  • Proton transfer reactions are fundamental in chemical and biological systems.
  • Vibrational strong coupling (VSC) is a quantum mechanical phenomenon where molecular vibrations interact strongly with their environment.
  • Previous studies on VSC primarily focused on ground-state chemical processes.

Purpose of the Study:

  • To investigate the impact of VSC on excited state proton transfer (ESPT) reactions in solution.
  • To understand how VSC influences the kinetics and internal dynamics of ESPT.
  • To explore the role of cooperative coupling between solvent and photoacid in VSC effects.

Main Methods:

  • Theoretical modeling of proton transfer reactions under VSC conditions.
  • Simulations of excited state dynamics in coupled photoacid-solvent systems.
  • Analysis of reaction rates, internal molecular dynamics, and quantum yields.

Main Results:

  • VSC significantly modifies the rates of excited state proton transfer.
  • Internal dynamics and quantum yields of the photoacid are substantially altered by VSC.
  • Cooperative coupling between the solvent and photoacid enhances the VSC effect on reactivity.

Conclusions:

  • VSC demonstrably influences excited state chemical reactivity.
  • The findings expand the known scope of VSC effects to excited-state processes.
  • This research highlights VSC as a critical factor in controlling photochemical reactions.