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- W2090513019 abstract "A new tetranuclear [2 × 2] cluster of Cu(II) with a symmetric carbohydrazone based ligand, [Cu4L4](NO3)4·1.6(H2O) (1), {where HL donates bis-[(E)-N’-(1-(pyridin-2-yl)ethylidene)]carbohydrazide} was synthesized and characterized by spectroscopic methods and X-ray analysis. The EPR spectra were performed on single crystals of complex 1 at various temperatures and allowed the identification and separation of two types of magnetic objects contributing to magnetism: single atoms of Cu(II) and a tetranuclear Cu4 cluster. The main values of the g-factor and hyperfine structure were determined for single ions of Cu(II). The copper atoms in the tetramer are coupled antiferromagnetically with an isotropic antiferromagnetic exchange J = 215 K (149.4 cm−1). A small anisotropic exchange of the order of 0.06 K (0.04 cm−1) is responsible for the initial zero-field splitting of the energy levels in the tetramer spectrum. Magnetic measurements of complex 1 confirmed the existence of a strong antiferromagnetic exchange coupling between four Cu(II) ions. Complex 1 showed high potential for the catalytic and selective oxidation of cis-cyclooctene with aqueous H2O2." @default.
- W2090513019 created "2016-06-24" @default.
- W2090513019 creator A5019278540 @default.
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- W2090513019 creator A5067202056 @default.
- W2090513019 date "2015-03-01" @default.
- W2090513019 modified "2023-09-25" @default.
- W2090513019 title "Single crystal EPR spectroscopy, magnetic studies and catalytic activity of a self-assembled [2×2] CuII4 cluster obtained from a carbohydrazone based ligand" @default.
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- W2090513019 doi "https://doi.org/10.1016/j.poly.2014.11.038" @default.
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