Synthesis, structure, and magnetic properties of nickel(II), copper(II), cobalt(II), and zinc(II) 2,2,5,5-tetramethyl-3-imidazolin-1-oxyl-4-(1?-butylidene-2?-oxylates)

Abstract

Syntheses are reported for the coordination compounds of nickel(II), copper(II), cobalt(II), and zinc(II) with 4-(2′ -oxobutylidene)-2,2,5,5-tetramethyl-3-imidazolin-1-oxyl (LH) with the formula NL2. The central atom in solid NiL2 has square coordination, while in solution, this atom has distorted tetrahedral coordination. The coordination of the central atom in the other ML2 is distorted tetrahedral both in the solution and in the solid phase. CuL2 and CoL2 in the solid phase feature exchange clusters with ferromagnetic exchange interaction between the unpaired electrons of the paramagnetic sites.