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Cycloaddition Reactions: MO Requirements for Photochemical Activation

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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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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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Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions

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A Highly Effective Biomimetic Method for Simultaneously Enhancing the Stability and Functionality of Merocyanine

Pavithra Liyanage¹, Yi Liao¹

¹Department of Chemistry and Chemical Engineering, Florida Institute of Technology, Melbourne, Florida 32901, United States.

The Journal of Physical Chemistry. B

|September 8, 2025

Summary

Merocyanine photoacids (MCHs) show improved stability and solubility within sodium dodecyl sulfate (SDS) micelles. This micelle encapsulation significantly enhances their potential for photo pH modulation in various applications.

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Area of Science:

Photochemistry
Supramolecular Chemistry
Materials Science

Background:

Merocyanine photoacids (MCHs) are versatile molecules with applications in diverse fields.
Key limitations for MCHs include hydrolysis, high dark acidity, and poor water solubility.
Addressing these limitations is crucial for their industrial and practical implementation.

Purpose of the Study:

To enhance the stability, solubility, and performance of merocyanine photoacids (MCHs).
To investigate the protective effect of sodium dodecyl sulfate (SDS) micelles on MCHs.
To improve the photo pH-modulation capabilities of MCHs for practical applications.

Main Methods:

Incorporation of a common MCH into sodium dodecyl sulfate (SDS) micelles.
Utilized Nuclear Magnetic Resonance (NMR) and UV-Vis absorption spectroscopy for characterization.
Investigated MCH stability, solubility, and acidity in aqueous solutions with SDS.

Main Results:

MCHs were localized near the micelle surface, with the indolinium moiety within the micelle and the phenol moiety exposed to water.
The half-life of MCHs in aqueous solution increased over 100-fold (to nearly half a year) with 15 mM SDS.
Solubility increased by several orders of magnitude, and dark acidity decreased significantly.
Structural modification with a dodecoxyl group and SDS addition effectively prevented hydrolysis.

Conclusions:

Sodium dodecyl sulfate (SDS) micelles effectively protect merocyanine photoacids (MCHs) while allowing proton release.
Micelle encapsulation dramatically improves MCH stability, solubility, and photo pH-modulation performance.
This strategy overcomes major hurdles for the practical application of MCHs in various industrial settings.