This minireview collects the results that we obtained in the recent years on luminescent compounds based on imidazo[1,5-a]pyridines, an interesting class of heterocycles characterized by relevant photophysical properties like high Stokes shift, good absolute quantum yields, good photostability and a λem modulable depending on the substituents on the heterocyclic ring. These peculiar features can be transferred to the corresponding complexes when imidazo[1,5-a]pyridines are used as ligands. Herein we report on the photoluminescent behavior of zinc(II) and silver(I) complexes with 1-pyridylimidazo[1,5-a]pyridines acting as N,N-bidentate, neutral ligands. Then, zinc(II) and boron(III) compounds bearing N,O- monoanionic 2-(imidazo[1,5-a]pyridin-3-yl)phenolates will also be described. In all cases, a bright fluorescence emission was observed, either in the solid state or in solution; some promising derivatives showed a relevant photoluminescent behavior also when analyzed as thin films. A full spectroscopic characterization, combined with a theoretical approach (DFT), allowed to establish structure-properties relationships for the species investigated.

Imidazo[1,5-a]pyridine-based derivatives as highly fluorescent dyes

Colombo, Gioele
Primo
;
Attilio Ardizzoia, G.
Secondo
;
Brenna, Stefano
Ultimo
2022-01-01

Abstract

This minireview collects the results that we obtained in the recent years on luminescent compounds based on imidazo[1,5-a]pyridines, an interesting class of heterocycles characterized by relevant photophysical properties like high Stokes shift, good absolute quantum yields, good photostability and a λem modulable depending on the substituents on the heterocyclic ring. These peculiar features can be transferred to the corresponding complexes when imidazo[1,5-a]pyridines are used as ligands. Herein we report on the photoluminescent behavior of zinc(II) and silver(I) complexes with 1-pyridylimidazo[1,5-a]pyridines acting as N,N-bidentate, neutral ligands. Then, zinc(II) and boron(III) compounds bearing N,O- monoanionic 2-(imidazo[1,5-a]pyridin-3-yl)phenolates will also be described. In all cases, a bright fluorescence emission was observed, either in the solid state or in solution; some promising derivatives showed a relevant photoluminescent behavior also when analyzed as thin films. A full spectroscopic characterization, combined with a theoretical approach (DFT), allowed to establish structure-properties relationships for the species investigated.
2022
2022
Imidazo[1,5-a]pyridines; Fluorescence emission; high Stokes shift; Zinc(II); Silver(I); Boron(III)
Colombo, Gioele; Attilio Ardizzoia, G.; Brenna, Stefano
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11383/2129150
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