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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: 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

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

1.9K
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...
1.9K
Structure and Physical Properties of Alkynes02:37

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Introduction:
In nature, compounds containing both carbon and hydrogen are known as "hydrocarbons". Aliphatic hydrocarbons are compounds whose molecules contain saturated single bonds (i.e., alkanes) or unsaturated double or triple bonds. Alkenes contain carbon–carbon double bonds and have a structural formula CnH2n. Unsaturated hydrocarbons containing carbon–carbon triple bonds are called "alkynes" and are structurally represented by the formula CnH2n-2.
The...
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¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

2.8K
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...
2.8K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.6K
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.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
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Singlet Fission in Weakly Interacting Acene Molecules.

Sharareh Izadnia1, David W Schönleber2, Alexander Eisfeld2

  • 1Physikalisches Institut, Universität Freiburg , 79104 Freiburg, Germany.

The Journal of Physical Chemistry Letters
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Singlet fission (SF) in disordered systems, like organic chromophores on rare gas clusters, offers a novel pathway to overcome solar cell efficiency limits. This study explores SF in such systems, varying molecular arrangements to optimize energy conversion.

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Area of Science:

  • Photovoltaics and Renewable Energy
  • Organic Electronics
  • Quantum Chemistry

Background:

  • The Shockley-Queisser limit traditionally restricts solar cell energy conversion efficiency.
  • Singlet fission (SF) is a process where one high-energy exciton splits into two lower-energy excitons, potentially boosting efficiency.
  • Previous SF studies primarily focused on ordered crystalline solids and films.

Purpose of the Study:

  • To investigate singlet fission in a disordered system for enhanced solar energy conversion.
  • To explore the impact of intermolecular distances and excitation levels on SF rates.
  • To develop a model for understanding SF in non-crystalline organic systems.

Main Methods:

  • Utilizing organic chromophores distributed on rare gas cluster surfaces.
  • Systematically varying intermolecular distances and excitation degrees.
  • Developing and applying a kinematic model incorporating geometric arrangements and time-dependent molecular state populations.

Main Results:

  • Demonstrated singlet fission in a disordered organic system on a rare gas cluster surface.
  • Quantified the influence of molecular arrangement and excitation on SF rates.
  • Validated experimental observations with a detailed kinematic model.

Conclusions:

  • Singlet fission is achievable in disordered organic systems, expanding possibilities beyond crystalline structures.
  • Control over molecular arrangement and excitation is key to optimizing SF for solar energy applications.
  • The developed kinematic model provides a framework for predicting and understanding SF in complex, disordered environments.