Naphthalenediol-based bis(Salamo)-type homo- and heterotrinuclear cobalt(II) complexes: Syntheses, structures and magnetic properties

作者：Zhang, Han; Dong, Wen-Kui^*; Zhang, Yang; Akogun, Sunday Folaranmi

来源：Polyhedron, 2017, 133: 279-293.

DOI：10.1016/j.poly.2017.05.051

• Salamo-type ligand
• Trinuclear complex
• Synthesis
• Crystal structure
• Magnetism

Homo- and heterotrinuclear Co(II) complexes with a new acyclic bis(Salamo)-type ligand H4L, which bears a C-shaped O-6 site by the metallation of the N2O2 Salamo moieties, were synthesized. The homotrinuclear complex [Co-3(L)(OAc)(2)(CH3OH)(2)]center dot 2CHCl(3) (1) was obtained by the reaction of H4L with 3 equivalents of Co(OAc)(2).4H(2)O. The heterotrinuclear complexes [Co-2(L)Ca(OAc)(2)] (2), [Co-2(L)Sr(OAc)(2)] (3) and [Co-2(L)Ba(OAc)(2)(H2O)]center dot 2CH(3)CH(2)OH (4) were acquired by the reaction of H4L with 2 equivalents of Co(OAc)(2).4H(2)O and 1 equivalent of M(OAc)(2) (M = Ca(II), Sr(II) and Ba(II)). In the crystal structures, the three metal(II) atoms occupy both the N2O2 and O-6 sites of the ligand (L)(4-) moiety. Owing to the different nature of the N2O2 and O-6 sites of the ligand H4L, the introduction of two different metal(II) atoms to the site-selective moiety, when compared with complex 1, leads to the replacement of the central Co (II) atom by different alkaline earth metal(II) atoms, namely the Ca(II), Sr(II) and Ba(II) atoms for complexes 2, 3 and 4, respectively. Magnetic measurements were performed on complexes 1-4, where an intramolecular ferromagnetic interaction was found in complex 3 and intramolecular antiferromagnetic interactions were found in complexes 1, 2 and 4. The magnetic susceptibilities above 50 K obey the Curie-Weiss law and their constant values were determined for all the complexes.

• 出版日期2017-9-5
• 单位兰州交通大学