Mono-, Bis-, and Tris-Chelate Zn(II) Complexes with Imidazo[1,5-a]pyridine: Luminescence and Structural Dependence

New mono-, bis-, and tris-chelate Zn(II) complexes have been synthesized starting from different Zn(II) salts and employing a fluorescent 1,3-substituted-imidazo[1,5-a]pyridine as a chelating ligand. The products have been characterized by single-crystal X-ray diffraction; mass spectrometry; and vib...

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Bibliographic Details
Published in:Molecules (Basel, Switzerland) Vol. 28; no. 9; p. 3703
Main Authors: Cerrato, Valerio, Volpi, Giorgio, Priola, Emanuele, Giordana, Alessia, Garino, Claudio, Rabezzana, Roberto, Diana, Eliano
Format: Journal Article
Language:English
Published: Switzerland MDPI AG 25.04.2023
MDPI
Subjects:
Diffraction
fluorescence
imidazo[1,5-a]pyridine
Ligands
Light emitting diodes
luminescence
Mass spectrometry
Nitrates
Optical properties
Pyridine
quantum yield
Stokes shift
Surface active agents
X-rays
Zinc
zinc complex
Stokes shift
luminescence
zinc complex
fluorescence
quantum yield
imidazo[1,5-a]pyridine
ISSN:1420-3049, 1420-3049
Online Access:Get full text
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Summary:New mono-, bis-, and tris-chelate Zn(II) complexes have been synthesized starting from different Zn(II) salts and employing a fluorescent 1,3-substituted-imidazo[1,5-a]pyridine as a chelating ligand. The products have been characterized by single-crystal X-ray diffraction; mass spectrometry; and vibrational spectroscopy. The optical properties have been investigated to compare the performances of mono-, bis-, and tris-chelate forms. The collected data (in the solid state and in solution) elucidate an important modification of the ligand conformation upon metal coordination; which is responsible for a notable increase in the optical performance. An intense modification of the emission quantum yield along the series in the solid state is observed comparing mono-, bis-, and tris-chelate adducts; independently from the anionic ligand introduced by ionic exchange.
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ISSN:1420-3049
1420-3049
DOI:10.3390/molecules28093703