LAUSR

Abstract Three 2p-3d complexes were successfully synthesized by using 4,5-dimethyltriazole nitronyl nitroxide radical. All of the complexes with the same formula of [M(hfac)2(4,5-di-Me-3-NIT-trz)2] [M = Co(II) 1, Ni(II) 2, Cu(II) 3; 4,5-di-Me-3-NIT-trz = 2-[3-(4,5-dimethyl-l,2,4-triazolyl)]-4,4,5,5-tetramethylimida- zoline-1-oxyl-3-oxide; hfac = hexafluoroacetylacetone] are characterized by X-ray analysis, and their magnetic properties were studied in detail. The metal ions in 1-3 are all in distorted octahedral configuration with four oxygen atoms from two bidentate hfac– ligands, and two triazole N atoms from two different 4,5-di-Me-3-NIT-trz ligands. The magnetic behaviors for 1-3 indicate that the metal ions and the radicals are antiferromagnetically coupled (JCo-rad = -7.11 cm-1, for 1; JNi-rad = -1.63 cm-1, for 2; JCu-rad = -8.71 cm-1, for 3). In addition, ferromagnetic coupling exists between the uncoordinated NO radicals in complex 1, while the magnetic reactions Jrad-rad are antiferromagnetic in complexes 2-3.