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

Switching of BJT01:22

Switching of BJT

867
Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
Cut-off Mode ("Off" State): In this state, both the emitter-base and collector-base junctions are...
867
Molecular Models02:00

Molecular Models

43.8K
Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
43.8K
Molecular Compounds: Formulas and Nomenclature03:10

Molecular Compounds: Formulas and Nomenclature

55.9K
Molecular compounds or covalent compounds result when atoms share electrons to form covalent bonds. Since there is no electron transfer, molecular compounds do not contain ions; instead, they consist of discrete, neutral molecules. 
55.9K
Molecular Orbital Theory II03:51

Molecular Orbital Theory II

27.6K
Molecular Orbital Energy Diagrams
27.6K
Molecular Orbital Theory I02:35

Molecular Orbital Theory I

47.7K
Overview of Molecular Orbital Theory
47.7K
Predicting Molecular Geometry02:27

Predicting Molecular Geometry

46.0K
VSEPR Theory for Determination of Electron Pair Geometries
46.0K

You might also read

Related Articles

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

Sort by
Same author

N-N-N-N-O Benzotriazole Carbamates by Hypervalent Iodane Mediated Cross-Dehydrogenative N-N Coupling.

The Journal of organic chemistry·2026
Same author

Photocatalytic Synthesis of Unprotected Sulfonimidamides and Their Application in Photochemical Nitrene Transfer Reactions.

Angewandte Chemie (International ed. in English)·2025
Same author

Visible-Light-Mediated Radical α-C(sp<sup>3</sup>)─H <i>gem</i>-Difluoroallylation of Amides with Trifluoromethyl Alkenes via Halogen Atom Transfer and 1,5-Hydrogen Atom Transfer.

Organic letters·2025
Same author

The Impact of Hepatitis B Surface Antigen Reduction via Small Interfering RNA Treatment on Natural and Vaccine (BRII-179)-Induced Hepatitis B Virus-Specific Humoral and Cellular Immune Responses.

Gastroenterology·2025
Same author

TIP2-UDT1-OsUPEX1/2 module regulates tapetum development and function in rice.

The New phytologist·2025
Same author

Lewis-Acid-Catalyzed Diastereoselective [4 + 2] Cycloaddition of Vinyldiazo Compounds with <i>N</i>-Acyliminium Cations.

Organic letters·2025
Same journal

A Domino-Synthesized Dicoordinate Copper(I) Bis-imidazopyridine Complex Triggering Cuproptosis/Ferroptosis for Enhanced Cancer Immunotherapy.

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

Mirror-Symmetric Organic Two-Dimensional Crystals for Alternative Photon Transport Pathways.

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

Cobalt-Catalyzed Migratory E-Selective Asymmetric Aza-Nozaki-Hiyama-Kishi Coupling.

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

Facile Synthesis of α,ω-Dihydroxy Telechelic Macromonomers From Ethylene and α-Olefins for Recyclable Alternating Block Copolymers.

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

Multi-Atom Sub-Nanometer Assemblies on Interpenetrating Multi-Chambered N/C Nanospheres.

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

A Synergistic C<sub>2+</sub> Alcohols/Olefins-Intermediated Pathway Boosts CO<sub>2</sub> Hydrogenation to Aromatics.

Angewandte Chemie (International ed. in English)·2026
See all related articles

Related Experiment Video

Updated: Feb 7, 2026

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

8.2K

A Helicate-Based Three-State Molecular Switch.

Xiaofei Chen1, Thomas M Gerger1, Christoph Räuber1

  • 1Institut für Organische Chemie, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany.

Angewandte Chemie (International Ed. in English)
|July 21, 2018
PubMed
Summary
This summary is machine-generated.

Researchers designed helicates that structurally respond to counterions, enabling control over compressed/expanded states and aggregate twist. This allows reversible switching between three specific helicate configurations for functional device development.

Keywords:
catechol esterhelicatesmolecular switchself-assemblystereochemistry

More Related Videos

Helical Organization of Blood Coagulation Factor VIII on Lipid Nanotubes
12:24

Helical Organization of Blood Coagulation Factor VIII on Lipid Nanotubes

Published on: June 3, 2014

12.7K
Design to Implementation Study for Development and Patient Validation of Paper-Based Toehold Switch Diagnostics
10:42

Design to Implementation Study for Development and Patient Validation of Paper-Based Toehold Switch Diagnostics

Published on: June 17, 2022

3.5K

Related Experiment Videos

Last Updated: Feb 7, 2026

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

8.2K
Helical Organization of Blood Coagulation Factor VIII on Lipid Nanotubes
12:24

Helical Organization of Blood Coagulation Factor VIII on Lipid Nanotubes

Published on: June 3, 2014

12.7K
Design to Implementation Study for Development and Patient Validation of Paper-Based Toehold Switch Diagnostics
10:42

Design to Implementation Study for Development and Patient Validation of Paper-Based Toehold Switch Diagnostics

Published on: June 17, 2022

3.5K

Area of Science:

  • Coordination Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Controlling structural transformations in response to external stimuli is crucial for designing advanced functional materials and devices.
  • Helicates, a class of coordination compounds, offer potential for dynamic structural manipulation.

Purpose of the Study:

  • To demonstrate the design of helicates that exhibit distinct structural responses to different counterions.
  • To achieve controlled and reversible switching between compressed and expanded states of helicates.
  • To enable precise control over the helical twist of supramolecular aggregates.

Main Methods:

  • Utilizing enantiomerically pure ester-bridged dicatecholate ligands to construct helicate structures.
  • Employing counterion introduction, exchange, and removal as external triggers for structural modulation.
  • Characterizing the different helicate states (expanded/left-handed, expanded/right-handed, compressed/left-handed) through structural analysis.

Main Results:

  • Helicates were successfully designed to adopt either compressed or expanded structures based on the presence of specific counterions.
  • Reversible switching between these structural states was achieved.
  • Control over the helical twist of the aggregate was demonstrated, allowing access to distinct configurations.
  • Three out of four possible helicate states were specifically addressed and manipulated.

Conclusions:

  • The study highlights the potential of rationally designed helicates as responsive building blocks for functional devices.
  • Counterion-mediated control over helicate structure and twist offers a versatile platform for developing switchable supramolecular systems.
  • This work provides a foundation for creating complex molecular machines and responsive materials through precise structural control.