Abstract
Tetranuclear MnII2MnIII2 complexes with 1,3-bis(5-bromo-3-metoxysalicylidenaminomethyl)-2-propanol (H3bmsap) and 1,3-bis(5-chloro-3-methoxysalicylidenaminomethyl)-2-propanol (H3cmsap), [Mn4(bmsap)2(CH3CO2)3(CH3O)] (3) and [Mn4(cmsap)2(CH3CO2)3(CH3O)] (4), were synthesized and characterized by elemental analysis, infrared and diffused reflectance spectra and variable-temperature magnetic susceptibility measurements in the 2–300 K range. The crystal structures of 3 and 4 revealed a Y-shaped tetranuclear manganese cluster formed by the two Schiff-base ligands, three kinds of acetato ligands (bidentate, syn–anti-bridging, and syn–syn-bridging), and µ-methoxido ligand. The magnetic data showed the magnetic interactions among the four manganese atoms are antiferromagnetic as a whole within the tetranuclear cluster.
Highlights
Within the search for new molecule-based devices, manganese complexes are interesting from the viewpoint of both bioinorganic chemistry and material sciences [1,2,3,4,5,6,7,8]
Tetranuclear manganese complexes have received considerable interest because the unique tetranuclear manganese cluster structure with calcium ion was found in the PS-II in green plants [9,10,11,12]
We have focused on the synthesis of manganese complexes with multidentate organic ligands [16,17,18,19,20,21,22,23,24,25,26,27,28]
Summary
Within the search for new molecule-based devices, manganese complexes are interesting from the viewpoint of both bioinorganic chemistry and material sciences [1,2,3,4,5,6,7,8]. Many kinds of tetranuclear MnII2MnIII2 complexes have appeared in the literature, and butterfly-shaped tetranuclear MnII2MnIII2 complexes have remarkable magnetic properties with ferromagnetic couplings and SMM behavior [13,14,15] Based on this background, we have focused on the synthesis of manganese complexes with multidentate organic ligands [16,17,18,19,20,21,22,23,24,25,26,27,28]. We reported that tetranuclear manganese complexes with a Y-shaped core can be formed by the reaction of a multidentate Schiff-base ligand which has a methoxy group as a potential coordinating donor atom, 1,3-bis(3-methoxysalicylideneamino)-2-propanol (H3msap) [28]. This may come from magnetic interaction via the syn–anti-bridging acetato ligand
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