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Polybrominated BOPHY Dyes: Synthesis, Reactivity, and Properties.

Xiaokang Lv¹, Tingting Li¹, Qinghua Wu¹

¹The Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials (State Key Laboratory Cultivation Base), School of Chemistry and Materials Science, Anhui Normal University , Wuhu 241000, China.

The Journal of Organic Chemistry

|January 10, 2018

Summary

Researchers synthesized novel polybrominated BOPHY dyes and explored their reactivity. Attaching different chemical groups to these dyes allows tuning of their optical properties for potential applications.

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Area of Science:

Organic Chemistry
Materials Science
Photophysics

Background:

Bis(difluoroboron)-1,2-bis((1H-pyrrol-2-yl)methylene)hydrazine (BOPHY) dyes are known for their unique photophysical properties.
Controlling the substitution patterns on BOPHY dyes is crucial for tailoring their optical characteristics.

Purpose of the Study:

To regioselectively synthesize a series of mono- to hexabrominated BOPHY dyes.
To investigate the reactivity of these polybrominated BOPHY dyes through nucleophilic substitution and cross-coupling reactions.
To explore the impact of bromination and subsequent substitutions on the spectroscopic properties of BOPHY dyes.

Main Methods:

Regioselective bromination of BOPHY precursors.
Nucleophilic substitution and Suzuki/Stille cross-coupling reactions on brominated BOPHYs.
Characterization using NMR, HRMS, and crystal structure analysis.
Spectroscopic analysis (absorption and fluorescence) of the synthesized dyes.

Main Results:

Successful synthesis of mono- to hexabrominated BOPHY dyes in 41-96% yields.
Formation of 5- or 5,5'-substituted BOPHYs with various functional groups (amine, pyrrole, thiophene, phenyl) in 37-94% yields.
Confirmation of regioselectivity through advanced analytical techniques.
Observation of strong absorbance and bright fluorescence (430-660 nm) in most synthesized dyes.
Red-shifted absorption and emission spectra with increased bromination.
Demonstration that substituent positions significantly modulate photophysical properties.

Conclusions:

A versatile synthetic route to polybrominated and substituted BOPHY dyes has been established.
The study provides a method for fine-tuning the photophysical properties of BOPHY dyes by controlling bromination and substitution patterns.
The synthesized dyes exhibit tunable optical properties, suggesting potential applications in areas requiring specific light absorption and emission characteristics.