Pyridyldicarboxamide-based multinuclear complexes: Syntheses, structural characterizations, and magnetic properties |
| |
Authors: | Linke Li Yaoting Fan |
| |
Affiliation: | Department of Chemistry, Zhengzhou University, Henan 450052, PR China |
| |
Abstract: | Using the pyridine dicarboxamide derivative N,N′-bis(1,3,4-thiadiazol-2-yl)-2,6-pyridinedi-carboxamide (H2-btapca) as ligand, two novel polynuclear complexes: dimeric {[Cu2(μ2-O2H)(btapca)2]·DMF·H2O} (1) and tetrameric {[Ni4((μ2-O2H)2(btapca)4)]·DMF·MeOH·3.5H2O} (2) were obtained. In complex 1, two center Cu(II) ions are bounded by two btapca ligands and one aqueous molecule acting as a μ2-H2O bridge connect them together. Complex 2 is a tetrameric complex, in which the based backbone is an assumed Ni4 tetrahedron with two μ2-O2H bridges existing inside the tetrahedron forming a basic [Ni2(μ2-O2H)]2 core, which are surrounded by four btapca ligands. The magnetic properties of the two polynuclear complexes were determined, the results show that for both of the two complexes, the overall weak ferromagnetic exchange interactions between central metal ions are evident, the best fitting parameters are: J = 7.47 cm−1 (g = 2.21) for dimeric Cu(II) complex 1, and 2J1 = 4.8 cm−1, 2J2 = −0.00204 cm−1(g = 2.14, zJ′ = 0.00077 cm−1) for tetrameric Ni(II) complex 2. |
| |
Keywords: | Pyridine carboxamide Dimeric complex Tetrameric complex Magnetic properties |
本文献已被 ScienceDirect 等数据库收录! |
|