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Article Dans Une Revue European Journal of Inorganic Chemistry Année : 2007

A Hexadecanuclear Copper(I)-Copper(II) Mixed-Valence Compound: Structure, Magnetic Properties, Intervalence Charge Transfer, EPR, and NMR

Résumé

Hexadecanuclear copper mixed-valence complex 2 containing 10 CuII centers and 6 CuI centers was isolated with N,O donor ligands. From the X-ray crystal structure, 2 was found to contain a centrosymmetric dimeric cation - each monomeric unit composed of eight copper centers. It displays a very broad and weak intervalence charge-transfer band around 1100 nm at room temperature in the solid state. Variable-temperature magnetic susceptibility measurements indicate an S = 1/2 ground state for half of 2, explicitly, each Cu8 moiety has a g value around 2.26. Complex 2 was examined by NMR spectroscopy at room temperature in solution and by EPR at low temperature; the data indicates that the valence is delocalized in 2 at room temperature but localized at low temperature.

Dates et versions

hal-00708434 , version 1 (15-06-2012)

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Senjuti De, Shubhamoy Chowdhury, Jnan P. Naskar, Michael G. B. Drew, Rodolphe Clérac, et al.. A Hexadecanuclear Copper(I)-Copper(II) Mixed-Valence Compound: Structure, Magnetic Properties, Intervalence Charge Transfer, EPR, and NMR. European Journal of Inorganic Chemistry, 2007, 23, pp. 3695-3700. ⟨10.1002/ejic.200700369⟩. ⟨hal-00708434⟩

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