Recent Advances in Highly Fluorescent Hydrazine-Inserted Pyrrole-Based Diboron-Anchoring Fluorophores: Synthesis and Properties

Abstract

Hydrazine-inserted pyrrole-based diboron fluorophores that display strong fluorescence in either the solution or solid state are widely used in biomedicine and optoelectronic materials science. A growing demand calls for multiple strategies for generating novel fluorophores to solve problems of small Stokes shifts and poor solid-state fluorescence. By changing their frameworks, several series of novel diboron compounds have recently been developed as increasingly valuable classes of fluorophores owing to their tunable structures and outstanding spectroscopic properties, such as high fluorescence quantum yields, large Stokes shifts, high photostability, and low LUMO energy levels due to the presence of electron-deficient BF₂ groups. This review mainly highlights key synthetic strategies for the fluorophores BOPHY, BOPPY, and BOAPY developed by our group, together with the superior properties of these compounds. Significant photophysical data for these fluorophores in solution and solid states are included within the scope of this review. The facile functionalization of these fluorophores permits practical structural modifications to generate novel versatile dyes with excellent chemical and photophysical properties. We believe that these fluorophores hold promise to make important contributions in a wide range of applications.

1 Introduction

2 BOPHY Fluorophore

2.1 Discovery of BOPHY and its Fundamental Properties

2.2 Synthesis and Properties of Modified BOPHY Derivatives

3 BOPPY and BOPYPY Fluorophores

3.1 Discovery of BOPPY and BOPYPY, and Their Fundamental Properties

3.2 Synthesis and Properties of Benzo-Fused BOPPYs from Isoindoles

3.3 Nucleophilic Substitution and Cross-Coupling Reactions of Halogenated BOPPYs

3.4 Knoevenagel Reaction

4 BOAPY and BOPAHY Fluorophores

5 Conclusion

Key words

fluorescent dyes - boron-containing dyes - B,N-heterocycles - fluorophores

Publikationsverlauf

Eingereicht: 07. Februar 2023

Angenommen nach Revision: 01. März 2023

Accepted Manuscript online:
01. März 2023

Artikel online veröffentlicht:
05. April 2023

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