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Unusual trinuclear complex of copper(II) containing a 4′-(3-methyl-2-thienyl)-4,2′:6′,4″-terpyridine ligand. Structural, spectroscopic, electrochemical and magnetic properties

Abstract : We report the synthesis, characterization, crystal and molecular structure as well as the spectroscopic, electrochemical and magnetic properties of an unexpected trinuclear copper(II) complex (1), made of three Cu(2-TTA)2 units (2-TTA = 2-thenoyltrifluoroacetone) bridged by two 4'-(3-methyl-2-thienyl)-4,2′:6′,4″-terpyridine (4-stpy) ligands. The central Cu(II) atom shows an octahedral geometry, while the lateral metal centers present a slightly distorted square pyramidal coordination sphere. It is suggested that the introduction of the relatively bulky substituent groups (2-thienyl and [sbnd]CF3) in the 2-TTA ligand are responsible of this uncommon coordination mode. The magnetic behavior of 1 is reported in terms of a combination of monomer and dimer units, leading to weak antiferromagnetic interaction (J = −1.93 cm−1). The cyclovoltammogram of 1 exhibits, in the cathodic potential region, three redox events due to Cu2+/Cu+ and Cu+/Cu0 redox couples and to the mono-electronic reduction of the 4-stpy ligand.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01544454
Contributor : Laurent Jonchère <>
Submitted on : Friday, July 7, 2017 - 1:35:33 PM
Last modification on : Friday, July 10, 2020 - 4:23:56 PM
Long-term archiving on: : Wednesday, January 24, 2018 - 3:13:55 PM

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D. Toledo, G. Ahumada, C. Manzur, T. Roisnel, O. Peña, et al.. Unusual trinuclear complex of copper(II) containing a 4′-(3-methyl-2-thienyl)-4,2′:6′,4″-terpyridine ligand. Structural, spectroscopic, electrochemical and magnetic properties. Journal of Molecular Structure, Elsevier, 2017, 1146, pp.213-221. ⟨10.1016/j.molstruc.2017.05.108⟩. ⟨hal-01544454⟩

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