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Related Concept Videos

Colors and Magnetism03:02

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Reaction centers are pigment-protein complexes that initiate energy conversion from photons to chemical entities. Therefore, photochemical reaction center is a more appropriate term that describes these complexes. The Nobel laureates Robert Emerson and William Arnold provided the first experimental evidence of photochemical reaction centers by demonstrating the participation of nearly 2,500 chlorophyll molecules for the release of just one molecule of oxygen. Despite thousands of photosynthetic...
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Related Experiment Video

Updated: Oct 25, 2025

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Ru-Se Coordination: A New Dynamic Bond for Visible-Light-Responsive Materials.

Jianxiong Han1,2, Chaoming Xie3, Yun-Shuai Huang1

  • 1CAS Key Laboratory of Soft Matter Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, Anhui Key Laboratory of Optoelectronic Science and Technology, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, People's Republic of China.

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Researchers developed a new Ru-Se photodynamic bond that reversibly forms and breaks under visible light without side reactions. This discovery enables the creation of advanced responsive and healable materials for diverse applications.

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Photochemistry

Background:

  • Photodynamic bonds offer dynamic material properties but often suffer from unwanted side reactions.
  • Existing photodynamic bonds have limitations in stability and reaction control, hindering their widespread application.

Purpose of the Study:

  • To introduce a novel Ru-Se coordination bond as a photodynamic bond.
  • To demonstrate its reversible formation and dissociation under visible light without side reactions.
  • To explore its utility in constructing advanced functional materials.

Main Methods:

  • Synthesis of Ru-Se bonds via coordination of selenoether ligands with a ruthenium complex.
  • Investigation of bond dynamics under visible light irradiation.
  • Fabrication and characterization of photoresponsive amphiphiles, surfaces, and polymer gels.

Main Results:

  • The Ru-Se bond reversibly forms in the dark and dissociates under visible light.
  • No side reactions were observed during the formation and dissociation processes.
  • Demonstrated applications in photoresponsive amphiphiles, switchable surface wettability, and reversible polymer gel transitions.

Conclusions:

  • The Ru-Se bond represents a new class of dynamic bond with high stability and controlled light responsiveness.
  • This bond is a versatile building block for creating responsive, reprocessable, and healable materials.
  • The absence of side reactions broadens the scope for designing advanced materials in various environments.