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Related Concept Videos

Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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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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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

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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.
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Overview
Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
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Epoxidation of alkenes via oxidation with peroxy acids involves the conversion of a carbon–carbon double bond to an epoxide using the oxidizing agent meta-chloroperoxybenzoic acid, commonly known as MCPBA. Since the O–O bond of peroxy acids is very weak, the addition of electrophilic oxygen of peroxy acids to...
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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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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A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks
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Information Encryption via Spirooxazine-Based Photochromic Chiral Metal-Organic Frameworks.

Jia-Hao Zhang1, Bin Zhou1, Dan Zhao1

  • 1Shaanxi Key Laboratory of Chemical Additives for Industry, College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, P. R. China.

Inorganic Chemistry
|March 19, 2026
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Summary

Researchers developed photochromic chiral metal-organic frameworks (MOFs) that exhibit solid-state photochromism. These novel MOFs show rapid, reversible color and fluorescence changes upon UV light exposure, enabling advanced applications.

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Nanotechnology

Background:

  • Spirooxazine (SO) derivatives are stimulus-responsive chromic materials but often lack solid-state photochromic activity.
  • Metal-organic frameworks (MOFs) offer a versatile platform to engineer materials with tailored properties.

Purpose of the Study:

  • To design and synthesize novel photochromic chiral MOFs incorporating spirooxazine linkers.
  • To investigate the solid-state photochromic behavior and synergistic optical responses of the synthesized MOFs.

Main Methods:

  • Fabrication of pillared-layer MOFs using paddle-wheel dinuclear Zn2(COO)4 SBUs, chiral camphoric acid, and spirooxazine derivative linkers.
  • Characterization of the MOFs' structure, photochromic properties, fluorescence modulation, and circular dichroism (CD) response upon UV irradiation.

Main Results:

  • The synthesized R/S-MOFs-TPSO exhibited robust solid-state photochromism with rapid and reversible color transitions (white to blue/purple) under UV light.
  • Synergistic changes in color and fluorescence intensity were observed, with fluorescence quenching up to 98.3%.
  • Photochromic behavior induced significant alterations in the CD spectrum, including signal amplification and new peak formation.

Conclusions:

  • The developed chiral MOFs successfully impart solid-state photochromism to spirooxazine moieties.
  • The materials demonstrate potential for advanced anticounterfeiting and information encryption through dual optical authentication (color and fluorescence).
  • The synergistic control over multiple optical properties in the solid state opens new avenues for responsive materials.