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Related Concept Videos

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.
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

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Optical Control of Living Cells Electrical Activity by Conjugated Polymers
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Coordination programming of photofunctional molecules.

Ryota Sakamoto1, Shinpei Kusaka, Mikihiro Hayashi

  • 1Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. sakamoto@chem.s.u-tokyo.ac.jp

Molecules (Basel, Switzerland)
|April 9, 2013
PubMed
Summary

Researchers developed novel photofunctional molecules. This includes photoisomerization in copper complexes, bright fluorescence in zinc complexes, and new Pechmann dye applications in organic electronics.

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Area of Science:

  • Photochemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Photofunctional molecules are crucial for advanced applications.
  • Controlling molecular behavior with light is a key research area.
  • Existing materials often have limitations in performance or synthesis.

Purpose of the Study:

  • To present recent advancements in photofunctional molecules.
  • To explore new concepts in photoisomerization and fluorescence.
  • To develop novel materials for organic electronics.

Main Methods:

  • Synthesis and characterization of pyridylpyrimidine-copper complexes.
  • Investigation of photoinduced electron transfer (PET) and metal-to-ligand charge transfer (MLCT).
  • Development of heteroleptic bis(dipyrrinato)zinc(II) complexes and Pechmann dye derivatives.

Main Results:

  • Photonic regulation of ring inversion in copper complexes via redox state modulation and PET.
  • Heteroleptic zinc complexes exhibit bright fluorescence in polar solvents, overcoming limitations of homoleptic counterparts.
  • New synthetic routes for Pechmann dye yield a novel structural isomer and demonstrate potential in organic electronics.

Conclusions:

  • Novel photofunctional molecules with tunable properties have been developed.
  • These advancements offer new possibilities for light-controlled processes and materials.
  • The demonstrated potential of Pechmann dye derivatives opens avenues for organic electronic applications.