Molecule-Based Magnets with 1D Chain Structure of Bifurcated H-Bonding: Syntheses,Structure, and Magnetic Properties

Two complexes PyH]Ni(Mnt)₂] (I) and QlH]Ni(Mnt)₂] (II) (Mnt^2– = maleonitriledithiolate, PyH]⁺ = pyridinium, QlH]⁺ = quinolinium) were synthesized and characterized by elemental analysis and IR spectra. ESR spectra of polycrystalline samples collected at room temperature are isotropic with g = 2.039 for Iand anisotropic with g _z = 1.997, g _y g _x = 2.102 (g _av = 2.068) for II. The magnetic susceptibility data of I and II have been measured in the temperature range of 2–300 K. The results obtained suggest the antiferromagnetic coupling interactions between neighboring Ni³⁺ ions for I and ferromagnetic coupling interactions for II, respectively. Based on the crystal structure analysis of I, the magnetic properties of two complexes were discussed.