Synthesis, crystal structure and battery-like studies on a new acylpyrazolone-based mixed-ligand Cu(II) complex

A new mixed-ligand Cu(II) complex, [Cu(pyr)(bpy)(OH 2 )]ClO 4 (1), was synthesized from 4-acetyl-3-methyl-1-phenyl-2-pyrazoline-5-one (H-pyr) and 2,2-bipyridine (bpy). Single-crystal X-ray diffraction, elemental analysis, and FTIR and UV–Vis spectroscopy were used to confirm its structure. The pyr l...

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Bibliographic Details
Published in:Research on chemical intermediates 2022-02, Vol.48 (2), p.575-591
Main Authors: Hasanzadeh Esfahani, Maryam, Boorboor Ajdari, Farshad, Poormohammadi, Elaheh B., Abbasi, Alireza, Behzad, Mahdi
Format: Article
Language:English
Subjects:
Catalysis
Chemistry
Chemistry and Materials Science
Coordination compounds
Crystal structure
Diffusion rate
Electrochemical analysis
Electrochemical impedance spectroscopy
Energy storage
Flux density
Inorganic Chemistry
Ligands
Physical Chemistry
Single crystals
Spectrum analysis
Synthesis
Tautomers
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Summary:A new mixed-ligand Cu(II) complex, [Cu(pyr)(bpy)(OH 2 )]ClO 4 (1), was synthesized from 4-acetyl-3-methyl-1-phenyl-2-pyrazoline-5-one (H-pyr) and 2,2-bipyridine (bpy). Single-crystal X-ray diffraction, elemental analysis, and FTIR and UV–Vis spectroscopy were used to confirm its structure. The pyr ligand is the monoanionic deprotonated form of the H-pyr enol tautomer. Additionally, the complex’s battery-like capabilities were investigated. The newly synthesized complex possessed a high specific capacity and provided sufficient energy density for SC devices. Electrochemical evaluations, such as cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy (EIS), indicated that (1) with redox of metal-center holds satisfactory capacity and delivered energy when constructed in three- or two-electrode configuration (KOH 3 M). (1) displayed battery-like qualities (b-value ~ 0.88), as determined by the diffusion contribution at various scan rates. In an alkaline environment, the EIS measurements revealed a low interfacial charge resistance. The maximum specific capacity measured in the three-electrode system was 483 C g −1 (413.6 C g −1 at 2 mV s −1 ) at a current density of 1 A g −1 . These pyrazolone-based compounds would be promising candidates for further energy storage.
ISSN:0922-6168
1568-5675
DOI:10.1007/s11164-021-04605-5