Facile synthesis of Cu(II) complexes of monocondensed N,N,N donor Schiff base ligands: crystal structure, spectroscopic and magnetic properties

Chattopadhyay, Shouvik ; Ray, Mau Sinha ; Drew, Michael G. B. ; Figuerola, Albert ; Diaz, Carmen ; Ghosh, Ashutosh (2006) Facile synthesis of Cu(II) complexes of monocondensed N,N,N donor Schiff base ligands: crystal structure, spectroscopic and magnetic properties Polyhedron, 25 (11). pp. 2241-2253. ISSN 0277-5387

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

Related URL: http://dx.doi.org/10.1016/j.poly.2006.01.024

Abstract

Four new copper (II) complexes, [(CuL1N3)2](ClO4)2 (1), [(CuL2N3)2](ClO4)2 (2), [CuL3(N3)(ClO4)]n (3) and [CuL4(μ-1,1-N3)(μ-1,3-N3)(ClO4)]n (4) where L1 = N1-pyridin-2-yl-methylene-propane-1,3-diamine, L2 = N1-(1-pyridin-2-yl-ethylidene)propane-1,3-diamine, L3 = N1-(1-pyridin-2-yl-ethylidene)ethane-1,2-diamine and L4 = N1-(1-pyridin-2-yl-ethylidene)propane-1,2-diamine are four tridentate N,N,N donor Schiff base ligands, have been derived and structurally characterized by X-ray crystallography. Compounds 1 and 2 consist of double basal–apical end-on (EO) azide bridged dinuclear CuII complexes with square-pyramidal geometry. In complex 3 the square planar mononuclear [CuL3(N3)] units are linked by weakly coordinated perchlorate ions in the axial positions of CuII to form a one-dimensional chain. Two such chains are connected by hydrogen bonds involving perchlorate ions and azide groups. Compound 4 consists of 1-D chains in which the CuII ions with a square-pyramidal geometry are alternately bridged by single EO and end-to-end (EE) azido ligands, both adopting a basal–apical disposition. Variable temperature (300–2 K) magnetic susceptibility measurements and magnetization measurements at 2 K have been performed. The results reveal that complexes 1 and 2 are antiferromagnetically coupled through azido bridges (J = −12.18 ± 0.09 and −4.43 ± 0.1 cm−1 for 1 and 2, respectively). Complex 3 shows two different magnetic interactions through the two kinds of hydrogen bonds; one is antiferromagnetic (J1 = −9.69 ± 0.03 cm−1) and the other is ferromagnetic (J2 = 1.00 ± 0.01 cm−1). From a magnetic point of view complex 4 is a ferromagnetic dinuclear complex (J = 1.91 ± 0.01 cm−1) coupled through the EO bridge only. The coupling through the EE bridge is practically nil as the N(azido)–CuII (axial) distance (2.643 Å) is too long.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:CuII Complexes; N,N,N Donor Tridentate Schiff Base; X-ray Structure; Magnetic Properties; Azide Bridged; Perchlorate Bridged
ID Code:108387
Deposited On:13 Oct 2017 13:07
Last Modified:13 Oct 2017 13:07

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