title: Different supramolecular hydrogen bond structures and significant changes in magnetic properties in dinuclear mu 2-1,1-N3 copper(II) complexes with very similar tridentate Schiff base blocking ligands.
abstract: Three new basal-apical, mu(2)-1,1-azide bridged complexes, [CuL(1)(N(3))](2) (1), [CuL(2)(N(3))](2) (2) and [CuL(3)(N(3))](2) (3) with very similar tridentate Schiff base blocking ligands [L(1) = N-(3-aminopropyl)salicylaldimine, L(2) = 7-amino-4-methyl-5-azahept-3-en-2-one and L(3) = 8-amino-4-methyl-5-azaoct-3-en-2-one) have been synthesised and their molecular structures determined by X-ray crystallography. In complex 1, there is no inter-dimer H-bonding. However, complexes 2 and 3 form two different supramolecular structures in which the dinuclear entities are linked by strong H-bonds giving one-dimensional systems. Variable-temperature (300-2 K) magnetic susceptibility measurements and magnetization measurements at 2 K reveal that complexes and have antiferromagnetic coupling while has ferromagnetic coupling which is also confirmed by EPR spectra at 4-300 K. Magnetostructural correlations have been made taking into consideration both the azido bridging ligands and the existence of intermolecular hydrogen bonds in complexes 2 and 3.
authors.affiliation: Department of Chemistry, University College of Science, University of Calcutta, 92, A.P.C. Road, Kolkata-700 009, India.
authors.forename: Mau Sinha
authors.initials: MS
authors.lastname: Ray
authors.forename: Ashutosh
authors.initials: A
authors.lastname: Ghosh
authors.forename: R
authors.initials: R
authors.lastname: Bhattacharya
authors.forename: G
authors.initials: G
authors.lastname: Mukhopadhyay
authors.forename: M G B
authors.initials: MG
authors.lastname: Drew
authors.forename: Joan
authors.initials: J
authors.lastname: Ribas