Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.1K
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...
1.1K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.1K
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...
1.1K
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

1.3K
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...
1.3K
Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

32.5K
sp3d and sp3d 2 Hybridization
32.5K
Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

47.3K
The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
47.3K
Radical Reactivity: Intramolecular vs Intermolecular01:33

Radical Reactivity: Intramolecular vs Intermolecular

1.8K
Radical reactions can occur either intermolecularly or intramolecularly. In an intermolecular radical reaction, a nucleophilic radical adds to an electrophilic alkene or vice versa. In such reactions, the radical and generally the alkene, which is also called the radical trap, are two different molecules. Additionally, for such intermolecular reactions to occur, the radical trap must be active, present in an excess concentration, and the radical starting material must have a weak...
1.8K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Charging Pyracylene: Steering Aromaticity and Reactivity of [12]Annulene by Substitution.

Journal of the American Chemical Society·2026
Same author

SITH: A quantum-chemical framework for predicting bond destabilization in stretched molecules.

The Journal of chemical physics·2026
Same author

Post-Modification of Tripyrenylenes to Enantiopure π-Extended D<sub>3</sub>-Symmetric Propellers.

Chemistry (Weinheim an der Bergstrasse, Germany)·2026
Same author

Copper-Catalyzed Domino Strategy Construction of Fused Benzopyrroloazepinone through the Reaction of Allenyloximes and Arylboronic Acids.

Organic letters·2026
Same author

Palladium-Catalyzed Approach to Highly Luminescent <i>para</i>-Difuropyrazines.

The Journal of organic chemistry·2026
Same author

An efficient and exact reformulation of fourth-order algebraic diagrammatic construction schemes.

The Journal of chemical physics·2026
Same journal

Gas-Responsive Metal-Organic Frameworks for Adaptive Thermal Energy Storage with Tunable Charge-Discharge Temperatures.

Journal of the American Chemical Society·2026
Same journal

Engineering a Thiamine-Dependent Benzoylformate Decarboxylase for Stereodivergent Radical C(sp<sup>3</sup>)-C(sp<sup>3</sup>) Bond Formation.

Journal of the American Chemical Society·2026
Same journal

Accelerated Directional Proton-Coupled Electron Transfer Enabled by Intrinsic Dipole Field in Biomimetic α-Helical Structure.

Journal of the American Chemical Society·2026
Same journal

Alternating Current-Driven Hydrogen Isotope Labeling of Aliphatic Amines Using 1,3-Propanedithiol as an Efficient Hydrogen Atom Transfer Reagent.

Journal of the American Chemical Society·2026
Same journal

Two-Dimensional van der Waals Polar Metal MoOBr<sub>2</sub>.

Journal of the American Chemical Society·2026
Same journal

Negatively Curved Chiral Bilayer Nanographene.

Journal of the American Chemical Society·2026
See all related articles

Related Experiment Video

Updated: Jul 20, 2025

Single-Molecule F&#246;rster Resonance Energy Transfer Methods for Real-Time Investigation of the Holliday Junction Resolution by GEN1
11:27

Single-Molecule Förster Resonance Energy Transfer Methods for Real-Time Investigation of the Holliday Junction Resolution by GEN1

Published on: September 18, 2019

9.5K

Efficient Intramolecular Singlet Fission in Spiro-Linked Heterodimers.

Oskar Kefer1,2, Lukas Ahrens3, Jie Han2,4

  • 1Physikalisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, D-69120 Heidelberg, Germany.

Journal of the American Chemical Society
|August 3, 2023
PubMed
Summary
This summary is machine-generated.

This study explores intramolecular singlet fission (iSF) in novel azaacene heterodimers, achieving improved triplet exciton yields. The findings highlight a new strategy for efficient energy conversion using spatially fixed chromophores.

More Related Videos

Author Spotlight: Investigating the Motion Dynamics of the Eukaryotic Replisome Components at the Single-Molecule Level
10:11

Author Spotlight: Investigating the Motion Dynamics of the Eukaryotic Replisome Components at the Single-Molecule Level

Published on: July 26, 2024

1.1K
Detection of Homologous Recombination Intermediates via Proximity Ligation and Quantitative PCR in Saccharomyces cerevisiae
07:55

Detection of Homologous Recombination Intermediates via Proximity Ligation and Quantitative PCR in Saccharomyces cerevisiae

Published on: September 11, 2022

1.9K

Related Experiment Videos

Last Updated: Jul 20, 2025

Single-Molecule F&#246;rster Resonance Energy Transfer Methods for Real-Time Investigation of the Holliday Junction Resolution by GEN1
11:27

Single-Molecule Förster Resonance Energy Transfer Methods for Real-Time Investigation of the Holliday Junction Resolution by GEN1

Published on: September 18, 2019

9.5K
Author Spotlight: Investigating the Motion Dynamics of the Eukaryotic Replisome Components at the Single-Molecule Level
10:11

Author Spotlight: Investigating the Motion Dynamics of the Eukaryotic Replisome Components at the Single-Molecule Level

Published on: July 26, 2024

1.1K
Detection of Homologous Recombination Intermediates via Proximity Ligation and Quantitative PCR in Saccharomyces cerevisiae
07:55

Detection of Homologous Recombination Intermediates via Proximity Ligation and Quantitative PCR in Saccharomyces cerevisiae

Published on: September 11, 2022

1.9K

Area of Science:

  • Organic Photovoltaics
  • Photochemistry
  • Materials Science

Background:

  • Intramolecular singlet fission (iSF) is a crucial process for enhancing solar cell efficiency.
  • Azaacene molecules offer tunable electronic properties for photophysical applications.
  • Designing heterodimers with specific linkers is key to controlling iSF dynamics.

Purpose of the Study:

  • To investigate the efficiency of intramolecular singlet fission (iSF) in spiro-linked azaacene heterodimers.
  • To explore the impact of combining different azaacenes on iSF quantum yields and absorption range.
  • To understand the driving forces and energy landscape of iSF in these novel molecular systems.

Main Methods:

  • Time-resolved spectroscopy was employed to monitor ultrafast photophysical processes.
  • Quantum chemical calculations were utilized to analyze electronic states and energy differences.
  • Condensation chemistry was used to synthesize the spiro-linked azaacene heterodimers.

Main Results:

  • Azaacene heterodimers exhibited improved iSF quantum yields compared to homodimers.
  • The absorption range was extended by combining different azaacene units.
  • The energy difference between the S1 state and the triplet pair (ΔE_iSF) was tunable.
  • An overall quantum yield for triplet exciton formation reached approximately 174%.

Conclusions:

  • Spiro-linked azaacene heterodimers represent a promising platform for efficient intramolecular singlet fission.
  • Tuning the electronic properties and spatial arrangement of chromophores is critical for optimizing iSF.
  • This work introduces a novel concept for achieving efficient heterogeneous iSF by minimizing through-space interactions.