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

Two new one-dimensional manganese(III) complexes [Mn-2(III)(L-1)(4)(piv)(2)] (1) and [Mn-III(L-2)(bix)]center dot 2H(2)O. 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 L-1(2-) ligand in eta(1):eta(1):eta(1):mu(2) mode. In complex 2, the Mn(III) ion is coordinated by the tetradentate L-2(2-) 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. (C) 2012 Elsevier B.V. All rights reserved.