Synthesis, Structure, and Magnetic Properties of a Dinuclear Antiferromagnetically Coupled Cobalt Complex

Abstract A new dinuclear cobalt(II) compound,[(TPA*)Co II (DHBQ 2– )Co II (TPA*)] 2+ ( 1 2+ ) {TPA* =tris[(3, 5‐dimethyl‐pyrazol‐l‐yl)methyl] amine, DHBQ = deprotonated 2, 5‐dihydroxy‐1, 4‐benzoquinone}, was prepared and structurally and magnetically characterized. X‐ray crystallography revealed the centrosymmetric dinuclear divalent cobalt ions bridged by DHBQ 2– unit. The cobalt ions in the title compound have a distorted octahedral arrangement by coordination with four nitrogens of a TPA* and two oxygens of a bridging DHBQ unit. Due to the interdimer offset face‐to‐face π–π stacking in the crystallographic ac plane, the complex shows extended 2D supramolecular structure. Magnetic experiments showed the cobalt‐based dinuclear compound exhibits antiferromagnetic interactions with g = 2.35 and J / k B = –2.76 K, respectively.