Effect of anionic co-ligands on structure and magnetic coupling of bis(μ-phenoxo)-bridged dinuclear copper (II) complexes

Biswas, Apurba ; Drew, Michael G. B. ; Song, You ; Ghosh, Ashutosh (2011) Effect of anionic co-ligands on structure and magnetic coupling of bis(μ-phenoxo)-bridged dinuclear copper (II) complexes Inorganica Chimica Acta, 376 (1). pp. 422-427. ISSN 0020-1693

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.ica.2011.07.005

Abstract

Two phenoxo bridged dinuclear Cu (II) complexes, [Cu2L2 (NO2)2] (1) and [Cu2L2 (NO3)2] (2) have been synthesized using the tridentate reduced Schiff-base ligand 2-[(2-dimethylamino-ethylamino)-methyl]-phenol (HL). The complexes have been characterized by X-ray structural analyses and variable-temperature magnetic susceptibility measurements. The structures of the two compounds are very similar having the same tridentate chelating ligand (L) and mono-dentate anionic ligand nitrite for 1 and nitrate for 2. In both complexes Cu (II) is penta-coordinated but the square pyramidal geometry of the copper ions is severely distorted (Addison parameter (τ) = 0.33) in 1 while the distortion is quite small (average τ = 0.11) in 2. These differences have marked effect on the magnetic properties of two compounds. Although both are antiferromagnetically coupled, the coupling constants (J = −140.8 and −614.7 cm−1 for 1 and 2, respectively) show that the coupling is much stronger in 2.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Copper (II); Reduced Schiff Base; Crystal Structure; Magnetic Properties; Antiferromagnetic Coupling
ID Code:108314
Deposited On:13 Oct 2017 13:07
Last Modified:13 Oct 2017 13:07

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