Synthesis, crystal structure and magnetic characterization of two Mn(III) chains with Schiff-base ligands

Abstract

Two new one-dimensional manganese(III) complexes [Mn2III(L1)4(piv)2] (1) and [MnIII(L2)(bix)]·2H2O⋅ClO4 (2) (H2L1=N-(2-hydroxyethyl)-3-methoxysalicylaldimine, H2L2=N,N′-bis(salicylidene)phenylenediamine, bix=1,4-bis-(imidazol-1-ylmethyl)benzene, piv=pivalate) have been synthesized and characterized by X-ray crystallography and magnetic measurements. Crystal structure studies reveal that complex 1 consists one-dimensional manganese(III) chains linked by L12- ligand in η1:η1:η1:μ2 mode. In complex 2, the Mn(III) ion is coordinated by the tetradentate L22- ligand in the equatorial plane, whereas bix ligand acts as bridge in the axial direction. Magnetic studies show that both complexes exhibit weak antiferromagnetic exchange coupling between Mn(III) ions.