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The Solid-State Multi-Color Fluorescence Switching from a [2.2]Paracyclophane-Based Triarylborane.

Lian-Feng Guo¹, Min Wang¹, Cui-Hua Zhao¹

¹School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, P. R. China.

Chemistry (Weinheim an Der Bergstrasse, Germany)

|August 9, 2024

Summary

This summary is machine-generated.

This study introduces g-BPhANMe2-Cp, a novel fluorophore exhibiting multicolor luminescence. It displays tunable solid-state emission for advanced applications in displays and security systems.

Keywords:

Acidochromic luminescence Mechanochromic luminescence Solid state multi-color fluorescence switching Triarylborane [2.2]Paracyclophanes

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Area of Science:

Materials Science
Organic Chemistry
Photophysics

Background:

Developing solid-state fluorophores with switchable multicolor emission is challenging.
Such materials are crucial for advanced displays, encryption, and anti-counterfeiting systems.

Purpose of the Study:

To synthesize and characterize a novel fluorophore, g-BPhANMe2-Cp, with switchable multicolor luminescence.
To investigate its mechanochromic and acidochromic luminescence properties for potential applications.

Main Methods:

Synthesis of g-BPhANMe2-Cp featuring electron-donating and -accepting groups on a paracyclophane scaffold.
Investigation of mechanochromic luminescence (MCL) through mechanical grinding, heating, and solvent fuming.
Evaluation of acidochromic luminescence (ACL) via protonation/deprotonation using trifluoroacetic acid and triethylamine.

Main Results:

g-BPhANMe2-Cp exhibits high fluorescence efficiency (ΦF=0.60-0.87) in the solid state due to suppressed π-π interactions.
Tricolor MCL was observed, with emission color changing based on mechanical treatment and subsequent stimuli.
Reversible ACL was demonstrated, with protonation shifting emission to shorter wavelengths (ΦF=0.31).

Conclusions:

g-BPhANMe2-Cp offers tunable solid-state emission across four colors (yellow, green, cyan, blue) by combining MCL and ACL.
This molecule presents a promising platform for advanced multicolor displays and security applications.