| Abstract: | Three new complexes, Co(hfac)2(NIToPy)] (1), CoCl2(NIToPy)2] (2), and Co(NIToPy)3](ClO4)2 (3), with NIToPy = 2-(2-Pyridyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazolyl-oxy-3-oxide, and hfac = hexafluoroacetylacetonate, have been synthesized. The compound 3 crystallized in the monoclinic space group P21, with two molecules in a unit cell of dimensions a = 10.565(4) Å, b = 14.714(9) Å, c = 14.596(7) Å, and β = 107.10(4)°. The temperature-dependent magnetic susceptibility measurements (4.2 K-300 K) for the complexes demonstrated strong antiferromagnetic exchange interaction between cobalt(II) ion and NIToPy radical spins with J = ?140.1 cm?1 for 1, J = ?94.2 cm?1 for 2, and J = ?161.8 cm?1 for 3, respectively. The magneto-structural correlation in these complexes has been discussed. |
