The templating effect of halides in the tetrameric copper(II) [Cu2(LH)2(μ4-X)Cu2(LH)2]3+ complexes (LH2=N-(2-pyridylmethyl)-N,N-bis-[2′-hydroxy-5′-methyl-benzyl]-amine; X=Br, Cl). Synthesis and magneto-structural characterization

• Published in: Polyhedron Vol. 76; pp. 117 - 121
• Main Authors: Manzur, J., Vega, A., Escuer, A.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 07-07-2014
• Subjects: Crystal structure; Magnetism; Phenoxo-bridged; Template effect; Tetracopper complexes; Template effect; Phenoxo-bridged; Magnetism; Tetracopper complexes; Crystal structure
• ISSN: 0277-5387
• DOI: 10.1016/j.poly.2014.03.048

The synthesis and magneto-structural characterization of two tetrameric copper(II) complexes containing the [Cu2(LH)2(μ4-X)Cu2(LH)2]3+ cation (X=Cl, Br) is described. The complexes are tetrametallic species formed around a central halide ion which behaves as an anionic template for the formation of the tetranuclear species by bridging two dimeric {Cu2(LH)2}2+ units. [Display omitted]
The synthesis, magnetic and structural characterization of two tetrameric copper(II) complexes {N(C4H9)4}-[Cu2(LH)2(μ4-Br)Cu2(LH)2](PF6)4 (1) and [Cu2(LH)2(μ4-Cl)Cu2(LH)2](Cl)2(PF6) (2) is described. LH stands for the hemi-deprotonated anion of the tripodal aminophenol ligand N-(2-pyridylmethyl)-N,N-bis-[2′-hydroxy-5′-methyl-benzyl]-amine. The complexes are tetrametallic species formed around the central halide ion which behaves as an anion template for the formation of the tetranuclear species, by bridging two dimeric phenoxo bridged [Cu2(LH)2]2+ units. The magnetic behaviour is dominated by the strong antiferromagnetic exchange within the dimeric unit, mediated by the phenoxo bridges: J=−439(4)cm−1, g=2.10(2) for (1) and J=−429(2)cm−1, g=2.090(9) for (2).