Blue fluorescent zinc(II) complexes based on tunable imidazo[1,5-a]pyridines

[Display omitted] •New zinc(II) complexes with fluorescent 1,3-substituted imidazo[1,5-a]pyridines.•Zinc(II) complexes showing an intense hypsochromic shift.•Significant increase of the quantum yield after complexation to Zn(II).•Fluorescent ligands with electron-donating or electron-withdrawing moi...

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Bibliographic Details
Published in:Inorganica Chimica Acta 2020-09, Vol.509, p.119662, Article 119662
Main Authors: Volpi, Giorgio, Priola, Emanuele, Garino, Claudio, Daolio, Andrea, Rabezzana, Roberto, Benzi, Paola, Giordana, Alessia, Diana, Eliano, Gobetto, Roberto
Format: Article
Language:English
Subjects:
Crystal structure
Crystals
Emission spectra
Fluorescence
Imidazo[1,5-a]pyridine
Ligands
Luminescence
Mass spectrometry
Optical properties
Pyridines
Quantum yield
Single crystals
Stokes shift
Tunable emission
Zinc
Zinc complex
Zinc compounds
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Summary:[Display omitted] •New zinc(II) complexes with fluorescent 1,3-substituted imidazo[1,5-a]pyridines.•Zinc(II) complexes showing an intense hypsochromic shift.•Significant increase of the quantum yield after complexation to Zn(II).•Fluorescent ligands with electron-donating or electron-withdrawing moieties.•Single crystal X-ray diffraction and topological-energetic packing analysis. Herein, we investigate the photophysical features of new zinc(II) chlorido complexes containing fluorescent 1,3-substituted imidazo[1,5-a]pyridines as ligands. The derivatives introduce electron-donating or electron-withdrawing moieties in position 3 on the ligand skeleton. The obtained compounds have been characterized with different spectroscopic techniques, their structure has been defined by single-crystal X-ray diffraction and mass spectrometry and their optical properties have been discussed in relation to the chemical structure. The comparison between the emission spectra of the free ligands and of the corresponding zinc(II) chlorido complexes shows an intense hypsochromic shift, due to the modification of the ligands conformation upon metal coordination, and a significant increase of the quantum yield after complexation.
ISSN:0020-1693
1873-3255
DOI:10.1016/j.ica.2020.119662