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Photochemical Electrocyclic Reactions: Stereochemistry01:26

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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.
Selection Rules: Photochemical Activation
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In a Diels–Alder reaction, the diene is usually an electron-rich system and acts as a nucleophile, whereas the dienophile is electron-deficient and functions as an electrophile. Much like the diene, the nature of the dienophile significantly impacts the outcome of the reaction. 
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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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Diels–Alder Reaction: Characteristics of Dienes01:29

Diels–Alder Reaction: Characteristics of Dienes

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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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Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
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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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Diestervinyl-functionalized acceptor-acceptor type dithienylethenes with efficient photochromic performance.

Sujun Wang1, Hui Zhou1, Chunlin Xiong1

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Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|February 23, 2023
PubMed
Summary

Researchers developed new dithienylethenes (DTEs) with efficient photochromism for photoelectric materials. These novel acceptor-acceptor DTEs show promising photoswitching in solvents and films, guided by DFT calculations.

Keywords:
Acceptor–acceptorDiestervinylDithienyletheneFluorescence switchPMMAPhotochromism

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Photochemistry

Background:

  • Dithienylethenes (DTEs) are crucial for developing advanced photoelectric functional materials.
  • Efficient photochromism in DTEs is key for applications like optical data storage and smart windows.

Purpose of the Study:

  • To synthesize and characterize novel acceptor-acceptor (A-A) type DTE derivatives.
  • To investigate the photochromic properties and solvent dependence of these new DTEs.
  • To elucidate the structure-property relationships governing their photochromic performance.

Main Methods:

  • Synthesis of two novel A-A type DTE derivatives (4a and 4b) incorporating diestervinyl moieties.
  • Structural confirmation using Nuclear Magnetic Resonance (NMR) spectroscopy (1H and 13C) and High-Resolution Mass Spectrometry (HRMS).
  • Photochromic performance evaluation under alternate ultraviolet and visible light irradiation in various solvents (toluene, chloroform, DMSO) and poly(methyl methacrylate) (PMMA) films.
  • Density Functional Theory (DFT) calculations to understand the electronic effects influencing photochromism.

Main Results:

  • Successful synthesis and characterization of novel A-A type DTE derivatives.
  • Demonstrated efficient photochromism and photoswitching behavior in solution and solid-state (PMMA film).
  • Observed a notable solvent-dependence in the photochromic response.
  • DFT calculations indicated that the strong Acceptor-Acceptor effect is critical for high-performance photochromism.

Conclusions:

  • The novel A-A type DTEs exhibit excellent photochromic properties and photoswitching capabilities.
  • Solvent effects significantly influence the photochromic behavior of these DTE derivatives.
  • The strong A-A electronic effect is a key factor in achieving efficient photochromism, providing guidance for future material design.