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Erschienen in: Journal of Sol-Gel Science and Technology 2/2022

31.03.2022 | Original Paper: Industrial and technological applications of sol–gel and hybrid materials

Enhancing catalytic activity of copper(II) complexes by curcuminoid as electron-withdrawing ligand for silane water-crosslinking reaction: a joint experimental and theoretical study

verfasst von: Shohei Tanaka, Mina Imamura, Kenta Adachi

Erschienen in: Journal of Sol-Gel Science and Technology | Ausgabe 2/2022

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Abstract

The catalytic performances of several copper(II) β-diketonate (Cu(II)(βDiK)2) complexes for the water-crosslinking reaction in the 3-methacryloxypropyltrimethoxysilane-grafted ethylene-propylene copolymer (EPR-g-MTMS) system were investigated. UV-vis spectroscopic measurements demonstrated the curcuminoids could strongly coordinate with copper(II) ion. Moreover, results of the kinetic examination revealed the good linear relationship between the stability constants and hydrolysis activation energies in the Cu(II)(βDiK)2 catalyzed EPR-g-MTMS system, suggesting the stability of Cu(II)(βDiK)2 complex was a very good catalytic activity predictor. The theoretical calculations demonstrated that the electron-withdrawing curcuminoids pulled the electron density from Cu2+ center to form the stable complex and decreased water-dissociation energy of axially coordinated water molecules with copper(II) ion. The results clearly show the β-diketone ligands affect the water-exchange reaction of copper(II) ion, resulting in the enhanced catalytic activities of Cu(II)(βDiK)2 complexes for the silane water-crosslinking reaction. Our results provide a promising potential to use metal-curcuminoids in the room-temperature-vulcanizing silicone rubber applications.

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Metadaten
Titel
Enhancing catalytic activity of copper(II) complexes by curcuminoid as electron-withdrawing ligand for silane water-crosslinking reaction: a joint experimental and theoretical study
verfasst von
Shohei Tanaka
Mina Imamura
Kenta Adachi
Publikationsdatum
31.03.2022
Verlag
Springer US
Erschienen in
Journal of Sol-Gel Science and Technology / Ausgabe 2/2022
Print ISSN: 0928-0707
Elektronische ISSN: 1573-4846
DOI
https://doi.org/10.1007/s10971-022-05773-5

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