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

Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para position.
UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent of conjugation in the...
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this process,...
Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...

You might also read

Related Articles

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

Sort by
Same author

Near-Infrared Dioxaborine-Containing Polymethines for Light-Activated Anticancer Activity.

ACS applied bio materials·2026
Same author

One Coordination Cage, Many Pathways: Multiple Stimuli Drive Reversible Transformations.

JACS Au·2026
Same author

Cumulative Spectroscopic Detection for Taylor Dispersion Analysis of Nanoparticles.

Analytical chemistry·2026
Same author

Programming Palladium Cage Geometry through Ligand Redox Modulation.

Angewandte Chemie (International ed. in English)·2026
Same author

Controlled Nitration of Solvent Green 5 as a Platform for Functional Perylene Derivatives.

Organic letters·2026
Same author

Poly(2-oxazoline)-Based Lipid Nanocapsules Containing Free Hydroxyl Group as Promising Alternative to Conventional PEG-Lipid Nanocapsules.

ACS omega·2026
Same journal

Switching Site Selectivity in Alkoxyamine Hydration: From Lone-Pair Direction to Solvent Network Dominance.

Journal of the American Chemical Society·2026
Same journal

A Topotactic Leap: 2D Layers to 3D Large-Pore Zeolite.

Journal of the American Chemical Society·2026
Same journal

Enhanced Hydrogen Evolution over Single-Atom Catalysts via Electrostatic Polarization in Contact-electro-catalysis.

Journal of the American Chemical Society·2026
Same journal

Tumor Acidity-Activatable Ionizable Lipid Nanoparticles for Selective Oncolytic Therapy.

Journal of the American Chemical Society·2026
Same journal

Alternating Magnetic Field Promotes Ammonia Cracking by Disrupting the Sabatier Limitation of Ruthenium Catalytic Species.

Journal of the American Chemical Society·2026
Same journal

Bulk Ferromagnetic Icosahedral Quasicrystals without Rapid Quenching.

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

Related Experiment Video

Updated: Jun 8, 2026

Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds
09:44

Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds

Published on: October 15, 2019

Reversible two-photon optical data storage in coumarin-based copolymers.

Konstantinos Iliopoulos1, Oksana Krupka, Denis Gindre

  • 1Laboratoire MOLTECH-Anjou, CNRS UMR 6200, Université d'Angers, 2 Bd Lavoisier, 49045 Angers cedex, France.

Journal of the American Chemical Society
|October 1, 2010
PubMed
Summary
This summary is machine-generated.

A novel polymer film enables rewritable optical data storage using reversible photoinduced dimerization. This method allows for high-contrast data writing, reading, and erasing, detectable exclusively through second-harmonic generation (SHG) imaging.

More Related Videos

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
10:35

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Published on: May 29, 2018

Related Experiment Videos

Last Updated: Jun 8, 2026

Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds
09:44

Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds

Published on: October 15, 2019

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
10:35

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Published on: May 29, 2018

Area of Science:

  • Materials Science
  • Optics
  • Polymer Chemistry

Background:

  • Optical data storage is crucial for information technology.
  • Developing rewritable and high-contrast storage media remains a challenge.
  • Second-harmonic generation (SHG) offers unique detection capabilities.

Purpose of the Study:

  • To propose a functionalized polymer film for efficient optical data storage.
  • To demonstrate a complete writing-reading-erasing-writing sequence using SHG.
  • To leverage reversible photoinduced dimerization for data manipulation.

Main Methods:

  • Fabrication of a functionalized polymer film incorporating a coumarin chromophore.
  • Utilizing reversible photoinduced dimerization for data writing and erasing.
  • Employing SHG imaging for high-contrast data detection and readout.

Main Results:

  • Achieved a straightforward and complete writing-reading-erasing-writing cycle.
  • Demonstrated high-contrast data storage capabilities.
  • Confirmed that data is exclusively detectable via SHG imaging.

Conclusions:

  • The proposed polymer film offers a promising platform for rewritable optical data storage.
  • The SHG-assisted process enables efficient and selective data manipulation.
  • This technology has potential applications in advanced optical memory systems.