Trinuclear-based coordination compounds of Mn(II) and Co(II) with 4-amino-3,5-dimethyl-1,2,4-triazole and azide and thiocyanate anions: Synthesis, structure and magnetic properties |
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Authors: | Qi Ma Miaoli Zhu Liping Lu |
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Institution: | a Institute of Molecular Science, Key Laboratory of Chemical Biology and Molecular Engineering of the Education Ministry, Shanxi University, Taiyuan, Shanxi 030006, People’s Republic of China b College of Chemistry and Chemical Engineering, Institute of Applied Chemistry, Shanxi Datong University, Datong, Shanxi 037009, People’s Republic of China c Education Institute of Taiyuan University, Taiyuan, Shanxi 030001, People’s Republic of China |
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Abstract: | A 2D layer complex 1 and a linear trinuclear complex 2 with mixed ligands have been synthesized and characterized by elemental analyses, IR and single-crystal X-ray diffraction. In 1, the Mn(II) ions are six-coordinated and lie in distorted octahedron coordination environments. Complex 1 is connected into a 2D layer structure based on a linear trinuclear Mn3(admtrz)4(N3)6 (admtrz = 4-amino-3,5-dimethyl-1,2,4-triazole) building unit with either (6,3) topology when Mn1 cations as three-connected nodes or (4,4) network when the coordination trinuclear units being regarded as four connected nodes. In 2, the Co(II) ions are in slightly distorted octahedron coordination geometries. The magnetic behaviors are investigated in the temperature range 1.8-300 K. The magnetic susceptibility measurements show that the Mn(II) ions of complex 1 are weakly antiferromagnetically coupled with g = 1.98(1), J1 = −6.31(5) cm−1 and J2 = −1.88(1) cm−1. There is dominant zero field splitting (ZFS) effects with g values, g// = 2.38(2) and g⊥ = 4.96(4), indicated a significant presence of the spin-orbit coupling and magnetization experiment reveals large, uniaxial zero-field splitting parameters of D = −29.55 cm−1 for 2. |
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Keywords: | Trinuclear manganese complex Trinuclear cobalt complex Topological analysis Magnetic behaviors 4-Amino-3 5-dimethyl-1 2 4-triazole |
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