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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.
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...

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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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Butadiene-based photoresponsive soft materials.

Suresh Das1, Shinto Varghese, N S Saleesh Kumar

  • 1Photosciences and Photonics Section, Chemical Sciences and Technology Division, National Institute for Interdisciplinary Science and Technology, Trivandrum-695 019, Kerala, India.

Langmuir : the ACS Journal of Surfaces and Colloids
|July 25, 2009
PubMed
Summary

Researchers explore light-responsive materials using molecular self-assembly. They focus on photoisomerization of polyenes, like butadiene, to create advanced liquid crystals and gels with tunable properties.

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Area of Science:

  • Material Science
  • Photochemistry
  • Supramolecular Chemistry

Background:

  • Stimuli-responsive materials are challenging to create.
  • Light offers precise, remote control for material transformations.
  • Natural photoresponsive systems inspire artificial counterparts.

Purpose of the Study:

  • To explore photoisomerization of polyenes for artificial photoresponsive materials.
  • To investigate the use of the butadiene chromophore in designing photoresponsive soft materials.
  • To understand molecular self-assembly's role in controlling photochemical and photophysical properties.

Main Methods:

  • Utilizing molecules with significant shape change upon photoisomerization.
  • Focusing on polyene photoisomerization (all-trans to cis isomers).
  • Studying liquid crystals and gels incorporating butadiene chromophores.

Main Results:

  • Demonstrated the potential of the butadiene chromophore in photoresponsive material design.
  • Showcased the application in liquid crystals and gels.
  • Highlighted the influence of molecular self-assembly on material properties.

Conclusions:

  • Photoisomerization of polyenes is a viable strategy for artificial photoresponsive materials.
  • Molecular self-assembly is crucial for tailoring photochemical and photophysical behaviors.
  • The butadiene chromophore is effective for developing advanced photoresponsive soft materials.