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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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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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The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
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A DNA-Based Two-Component Excitonic Switch Utilizing High-Performance Diarylethenes.

Simon M Büllmann1, Theresa Kolmar1, Nicolas F Zorn2

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Summary

New nucleosidic diarylethenes (DAEs) offer superior photochromic performance. These novel photoswitches enable efficient all-optical switching in oligonucleotide-based systems with high contrast and durability.

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DiarylethenesExcitonic SwitchNucleic AcidsPhotochromic Förster Resonance Energy Transfer (PcFRET)Photochromism

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Oligonucleotide Engineering

Background:

  • Nucleosidic diarylethenes (DAEs) are photochromic molecules with limited application in materials science.
  • Existing DAEs often lack sufficient thermal stability and fatigue resistance for practical use.

Purpose of the Study:

  • To develop novel nucleosidic diarylethenes (DAEs) with enhanced thermal stability and fatigue resistance.
  • To demonstrate the utility of these DAEs in constructing an all-optical excitonic switch based on oligonucleotides.

Main Methods:

  • Synthesis of doubly methylated DAEs derived from 2'-deoxyuridine.
  • Design and assembly of a FRET pair using a DAE-modified oligonucleotide and a tricyclic cytidine (tC) modified oligonucleotide.
  • Characterization of photochromic and FRET properties in both liquid and solid phases.

Main Results:

  • Developed DAEs exhibit high thermal stability and fatigue resistance, outperforming previous nucleosidic and non-nucleosidic DAEs.
  • An all-optical excitonic switch was successfully constructed using the DAE and tC oligonucleotides.
  • The switch demonstrated efficient, distance- and orientation-dependent photochromic FRET with superior ON/OFF contrast.
  • The system maintained performance over 100 switching cycles without detectable fatigue.

Conclusions:

  • Doubly methylated nucleosidic DAEs represent a significant advancement in photoswitch technology.
  • These DAEs enable the creation of robust and efficient all-optical switching systems for oligonucleotide-based applications.
  • The developed photoswitching system shows promise for applications requiring precise optical control and high signal-to-noise ratios.