Xie YS, Jiang H, Chan ASC, Liu QL, Xu XL, Du CX, Zhu Y (2002a) Structural and magnetic properties of O-bridged tetranuclear and binuclear Cu(II) complexes. Inorganica Chimica Acta 333, 138-143. [In English]

Web link: http://dx.doi.org/10.1016/s0020-1693(02)00769-7

Keywords:

crystal structures, magnetic properties, O-bridge, Cu(II) complexes, crystal-structure, magnetostructural correlations, copper(ii) complexes, dimers,

Abstract: Two copper(II) complexes [Cu-4(L-1)(4)] (1) and [Cu-2(phen)(2)(HL2)(2)] (ClO4)(2) (2) have been synthesized from two potentially tridentate ligands N-(2-hydroxybenzyl) propanolamine (H2L1) and N-(2-hydroxybenzyl) ethanolamine (H2L2). X-ray analyses revealed that 1 contains a Cu4O4 cubane core, with each two Cu(II) atoms bridged by a pair of alkoxides: 2 has a bis(mu(2)-phenoxo)-bridged dicopper(II) structure. Variable temperature magnetic measurements of 1 have revealed that the correlation between 2J and the bridge angles phi for 1 shows a very strong antiferromagnetic tendency, i.e. the ferromagnetic and antiferromagnetic interactions cross at the phi of 94.5degrees. The relatively weak antiferromagnetic interactions (2J = -226.8 cm(-1)) with respect to the bridge angles (phi = 100.4degrees) for 2 have been ascribed to the pyramidal distortions at the phenoxide oxygen atoms in addition to the unfavorable overlaps of the magnetic orbitals for the highly distorted copper coordination polyhedra. (C) 2002 Elsevier Science B.V. All rights reserved.