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Benzo[b]furan Platforms for Tailorable Photochromic Molecules.

Nicholas P Adams¹, Steven Garrido Hidalgo¹, John D Tovar^1,2

¹Department of Chemistry, Johns Hopkins University, 3400 N. Charles St., Baltimore, Maryland 21218, United States.

Organic Letters

|July 29, 2025

Summary

Researchers developed new photochromic molecules using a benzo[b]furan core. Tuning the thiophene groups allowed for diverse color changes and energy gaps, demonstrating predictable photochromic reactions.

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Area of Science:

Organic Chemistry
Materials Science
Photochemistry

Background:

Photochromic molecules are essential for advanced optical materials.
Benzo[b]furan derivatives offer a promising scaffold for designing photochromic systems.
Controlling molecular structure is key to tuning photochromic properties.

Purpose of the Study:

To synthesize and characterize novel photochromic molecules based on a benzo[b]furan core.
To investigate the effect of structural modifications on photochromic behavior.
To establish a predictive model for photochromic performance.

Main Methods:

Modular synthesis of benzo[b]furan derivatives with varying thiophene appendages.
Spectroscopic analysis to determine HOMO-LUMO energy gaps.
Photochromic testing to evaluate reversible color changes.

Main Results:

Successfully synthesized a series of benzo[b]furan-based photochromic molecules.
Demonstrated facile tuning of electronic and optical properties through structural modification.
Observed a broad range of visible color changes.
Confirmed that frontier molecular orbital localization predicts photochromic activity.

Conclusions:

The benzo[b]furan platform is versatile for developing tunable photochromic materials.
The modular synthesis approach allows for precise control over molecular properties.
Predictive models based on electronic structure are valuable for designing new photochromic compounds.