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A.N. Gusev, S Shulgin, I. Ryush, M. Hasegawa, M. Kiskin, N. Efimov, K. Lyssenko, I. Eremenko, W. Linert:
"Copper(II), Nickel(II) and Cobalt(II)/(III) self-assembled polynuclear complexes of bis((pyridin-2-yl)-1,2,4-triazol-3-yl)methane";
European Journal of Inorganic Chemistry, 2017 (2017), 3; 704 - 712.

The reaction of bis((pyridin-2-yl)-1,2,4-triazol-3-yl)methane (H2L) with copper(II), nickel(II) and cobalt(II) salts affords a series of unusual structures among them homoleptic binuclear complexes [Ni2(H2L)2(H2O)4](NO3)4·6H2O (1) [Ni2(H2L)2Cl2]Cl2·4H2O·2C4H8O2 (2), octanuclear complex [Ni8(H2L)12](NO3)16·21H2O (3) and tetranuclear complexes [Cu4(HL)4](ClO4)4·C2H5OH·3H2O (4) [Co4(HL)2(H2L)2(H2O)4](NO3)8 ·C2H5OH·6H2O (5), and [Co4(HL)2(H2L)2(H2O)4]·(ClO4)8·8H2O (6). All these compounds have been characterized by different techniques such as elemental analysis, ESMS, UV-Vis spectroscopy, X-ray structural analyses and magnetic measurements. It was found that nature of the cation and metal/ligand ratio have substantial impact on the coordination geometries of the unique complexes. The magnetic properties of compounds 1 and 2 show the presence of intramolecular ferromagnetic exchange interaction (J = +2.3 and +15.2 cm-1) combined with intermolecular antiferromagnetic coupling. The complex 3, 5, 6 show weak intramolecular antiferromagnetic interaction while, complex 4, shows quite strong antiferromagnetic behavior (J = -53.7 cm-1).

triazole ligands, self assembly, polynuclear complexes magnetic studies

http://dx.doi.org/10.1002/ejic.201601107