Supramolecular hydrogen-bond structures and magnetic interactions in basal-apical, dinuclear, azide-bridged copper(II) complexes

Ray, Mau Sinha ; Ghosh, Ashutosh ; Chaudhuri, Siddhartha ; Drew, Michael G. B. ; Ribas, Joan (2004) Supramolecular hydrogen-bond structures and magnetic interactions in basal-apical, dinuclear, azide-bridged copper(II) complexes European Journal of Inorganic Chemistry, 2004 (15). pp. 3110-3117. ISSN 1434-1948

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/ejic.20...

Related URL: http://dx.doi.org/10.1002/ejic.200300969

Abstract

The synthesis, characterisation, X-ray single crystal structures and magnetic properties of three new basal-apical μ2-1,1-azide-bridged complexes [CuL1N3]2 (1), [CuL2N3]2 (2) and [CuL3N3]2 (3) with very similar tridentate Schiff-base blocking ligands {HL1 = N-[2-(ethylamino)ethyl]salicylaldimine; HL2 = 7-(ethylamino)-4-methyl-5-azahept-3-en-2-one; HL3 = 7-amino-4-methyl-5-azaoct-3-en-2-one} have been reported [complex 1: monoclinic, P21/c, a = 8.390(2), b = 7.512(2), c = 19.822(6) Å, β = 91.45(5)°; complex 2: monoclinic, P21/c, a = 8.070(9), b = 9.787(12), c = 15.743(17) Å, β = 98.467(10)°; complex 3: monoclinic, P21/n, a = 5.884(7), b = 16.147(18), c = 11.901(12) Å, β = 90.050(10)°]. The structures consist of neutral dinuclear entities resulting from the pairing of two mononuclear units through end-on azide bridges connecting an equatorial position of one copper centre to an axial position of the other. The copper ions adopt a (4+1) square-based geometry in all the complexes. In complex 2, there is no inter-dimer hydrogen-bonding. However, complexes 1 and 3 form two different supramolecular structures in which the dinuclear entities are linked by H-bonds giving one-dimensional systems. Variable temperature (300−2 K) magnetic-susceptibility measurements and magnetisation measurements at 2 K reveal that all three complexes have antiferromagnetic coupling. Magneto-structural correlations have been made taking into consideration both the azido bridging ligands and the existence of intermolecular hydrogen bonds.

Item Type:Article
Source:Copyright of this article belongs to John Wiley and Sons, Inc.
Keywords:Azides; Copper; Hydrogen Bonds; Magnetic Properties; N,O Ligands; Schiff Bases
ID Code:108399
Deposited On:13 Oct 2017 12:40
Last Modified:13 Oct 2017 12:40

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