Temperature/Solvent-Induced Two Magnetic Nickel Coordination Compounds with 5-Aminodiacetic Isophthalate

The reaction of Ni(OAc)2·4H2O and 5-aminodiacetic isophthalate (H4adip) in the aqueous solution to produce a discrete nickel coordination compound, {[Ni1.5(H2O)9][Ni(adip)(H2O)3][Ni1.5(adip)(H2O)5]·10H2O}2 (1), whereas another nickel compound was isolated by assembling the same reactants at 80 °C in the mixed solvents of H2O and DMA, {[Ni(H2O)6][Ni3(adip)2(H2O)8]·7.5H2O}2 (2). Both 1 and 2 were structurally characterized by single-crystal X-ray diffraction, and other methods. The skeleton unit of 1 consisted of five crystallographically independent Ni2+ ions and two types of adip4− ligands, and the adjacent units were further generated a 3D supramolecular architecture through hydrogen bonds and π···π stacking interactions. Analogously, four types of six-coordinated Ni2+ ions and two kinds of adip4− ligands in 2 also formed a 3D supramolecular structure by hydrogen bonds and π···π stacking interactions. Moreover, the magnetic properties of 1 and 2 had been examined, and the results suggested that the presence of antiferromagnetic interactions among Ni2+ ions in both compounds.