Synthesis, crystal structure and ferromagnetic interactions of a novel nickel(II) complex involving nitroxide radicals

A novel nickel(II) complex, Ni(NIT2-thz)2(NO3)2 (NIT2-thz=2-(2′-thiazole)-4,4,5,5-tetrmethylimidazoline-1-oxyl-3oxide) was synthesized, the crystal structure and magnetic properties were mainly discussed in the present work. In the title compound, each nickel(II) ion is chelated by two NIT2-thz ligands through oxygen atoms of nitroxide group and nitrogen atoms of thiazole group forming two six-membered rings at equatorial positions, together with the coordination of two oxygen atoms from two nitrate anions at axial positions, which formed a elongated octahedral geometry. By the intermolecular interactions, the molecules were connected as a 2D network. Magnetic measurements show that there are moderate ferromagnetic interactions between the Ni(II) ions and the radicals (J=43.47 cm−1).