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.

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

Volpi, Giorgio
;
Priola, Emanuele;Giordana, Alessia;Garino, Claudio
;
Rabezzana, Roberto;Diana, Eliano
Last
2023-01-01

Abstract

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.
2023
28
9
3703
3703
https://www.mdpi.com/1420-3049/28/9/3703
Stokes shift; fluorescence; imidazo[1,5-a]pyridine; luminescence; quantum yield; zinc complex
Cerrato, Valerio; Volpi, Giorgio; Priola, Emanuele; Giordana, Alessia; Garino, Claudio; Rabezzana, Roberto; Diana, Eliano
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1911210
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