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Judicially Designed Boranil Analogue as Multi-Stimuli Material Displaying Rewritable Behavior.

Vaibhav S Marde¹, Dipayan Mondal¹, Duddu S Sharada²

¹Department of Chemistry, Indian Institute of Technology, Kandi, Hyderabad, Telangana, 502284, India.

Chemistry, an Asian Journal

|May 1, 2025

Summary

Chemical modifications in boranil analogues influence solid-state emission and mechanochromic properties. Bulkier appendages with spacers enable reversible mechanochromism, with potential for rewritable materials.

Keywords:

Boranil Fluorophores Mechanochromism Pyrene Rewritable materials

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Area of Science:

Materials Science
Organic Chemistry
Photophysics

Background:

Mechanochromism involves color change upon mechanical stress.
Boron-containing compounds (boranils) offer unique electronic properties.
Tailoring molecular structure is key to controlling material function.

Purpose of the Study:

To systematically investigate solid-state emission and mechanochromic properties of designed boranil analogues.
To understand how subtle chemical modifications affect mechanochromic behavior.
To explore the potential of these materials as rewritable systems.

Main Methods:

Synthesis of a series of boranil analogues with varying appendages.
Solid-state emission spectroscopy and mechanochromic testing.
Solution-phase spectroscopy and theoretical calculations for structural elucidation.

Main Results:

Smaller appendages resulted in inactive or minimally responsive mechanochromic properties.
Bulkier appendages with spacers (B-p-TPA, B-p-PY) exhibited reversible mechanochromism with spectral shifts of 21 nm and 17 nm.
B-p-TPA demonstrated potential as a rewritable material.

Conclusions:

Steric clash and rotational freedom around the boranil core are critical for mechanochromic activity.
Designed boranil analogues offer tunable solid-state emission and mechanochromic responses.
The study highlights the potential of boranil derivatives in advanced functional materials.