A 1,2,4‐Triazole‐based Polynuclear Mixed‐valence Mn^IIMn^III Complex: Synthesis, Characterization, and Magnetic Property

Abstract

A mixed‐valence Mn complex {[MnIIMnIII(HL)2(4,4′‐bpy)(H2O)2]·(ClO4)(DMF)3(4,4′‐bpy)0.5}n (1) [H2L = 3‐(2‐phenol)‐5‐(pyridin‐2‐yl)‐1,2,4‐triazole] was synthesized and characterized by X‐ray single‐crystal structure analysis and magnetic susceptibility. Single‐crystal X‐ray analysis revealed that complex 1 has a dinuclear core, in which adjacent central MnIII atoms are linked by 4,4′‐bipyridine to form an infinite one‐dimensional (1D) molecular configuration. According to the Mn surrounding bond lengths and bond valence sum (BVS) calculations, we demonstrated that the Mn atom coordinated to the pyridine N atoms is in the +2 oxidation state, while another Mn atom coordinated to the phenolic oxygen atoms is in the +3 oxidation state. Magnetic susceptibility data of the complex 1 indicate that the ferromagnetic interaction dominates in this complex.