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• W2069130005 endingPage "4030" @default.
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• W2069130005 abstract "Reaction between 4-methyl-2,6-bis(pyrazol-1-ylmethyl)phenol (HL) or its 3,5-dimethylpyrazole derivative (HL′) and Cu(ClO4)2·6H2O afforded [CuII2(L/L′)2(OClO3)2] 1 and 2. Complex 1 has been structurally characterized showing that each copper(II) centre is square pyramidal with two bridging phenoxide oxygens and two terminal pyrazole nitrogens in the equatorial plane and a perchlorate oxygen atom axially co-ordinated. Variable-temperature magnetic susceptibility measurements revealed that the dicopper(II) centres are strongly antiferromagnetically coupled [singlet–triplet energy separation, 2J (in cm–1): –1204 for 1 and –798 for 2]. The complexes exhibit 1H NMR spectra within δ 0–10 due to their S = 0 ground state. In MeCN solution they exhibit ligand field transitions in the range 14 300–16 600 cm–1 and phenolate-to-copper(II) charge-transfer transition at ≈22 700 cm–1. In MeCN solution each complex displays three consecutive irreversible responses (scan rate of 50 mV s–1) with Epc values (V vs. SCE) at –0.02, –0.54 and –0.86 (1) and 0.00, –0.42 and –0.80 (2). The first two responses are due to CuII–CuI and the most cathodic response to CuI–Cu0 redox processes, respectively." @default.
• W2069130005 created "2016-06-24" @default.
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• W2069130005 date "1999-01-01" @default.
• W2069130005 modified "2023-10-16" @default.
• W2069130005 title "Synthesis, magnetism, 1H NMR and redox activity of dicopper(II) complexes having a discrete {Cu2(μ-phenoxide)2}2+ unit supported by a non-macrocyclic ligand environment. Crystal structure of [Cu2(L)2(OClO3)2] [HL = 4-methyl-2,6-bis(pyrazol-1-ylmethyl)phenol] †" @default.
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• W2069130005 doi "https://doi.org/10.1039/a907250k" @default.
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