Water Dissociation of a Dinuclear Bis(3,5-dimethylpyrazolyl)methane Copper(II) Complex: X-ray Diffraction Structure, Magnetic Properties, and Characteristic Absorption of the (CuN2Cl2)2 Core
Autor
Torres J.F.
Bello-Vieda N.J.
Macías M.A.
Muñoz-Castro A.
Rojas-Dotti C.
Martínez-Lillo J.
Hurtado J.
Resumen
A complex of formula [{CuCl{H2C(3,5-Me2pz)}}2(µ-Cl)2] (1) is obtained and its structure is determined by single-crystal X-ray diffraction crystallography, revealing dinuclear character supporting a (CuN2Cl2)2 core. Compound 1 undergoes water dissociation that generates a change in the coordination sphere of the metals, yielding a mononuclear CuII complex of the formula [CuCl{H2C(3,5-Me2pz)2}2]Cl·3H2O (2), as supported by LeBail analysis and visible absorption spectroscopy. Interestingly, the optical features of 1 unravel characteristic patterns in the absorption spectrum, attributed solely to the formation of the (CuN2Cl2)2 core. The study of the magnetic properties of 1 reveals weak antiferromagnetic exchange coupling between the two CuII ions that is transmitted through the double-chloro bridge, which is supported by broken-symmetry DFT calculations. © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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