Mononuclear and dinuclear complexes of manganese(III) and Iron(III) supported by 2-salicyloylhydrazono-1,3-dithiane ligand: synthesis, characterization and magnetic properties

The coordination chemistry of 2-salicyloylhydrazono-1,3-dithiane (H2L) was studied with manganese and iron ions. The following complexes have been isolated as crystalline materials, and their crystal structures have been determined by single crystal X-Ray crystallography: Mn-III(acac)(HL)(2) (1) (acac = acetylacetonate), Mn-III(HL)(3)center dot CH2Cl2 (2), Fe-III(HL)(3)center dot 2CHCl(3) (3), Fe-II(H2L)(2)Cl-2 center dot 2CH(3)OH (4), Fe-2(III)(mu-OMe)(2)(HL)(4)center dot 0.5CH(3)OH (5), Fe-2(III)(mu-O) (HL)(4)center dot 3CH(2)Cl(2) (6). All attempts to synthesize the dinuclear mu-methoxo complex [Mn-2(III)(mu-OMe)(2)(HL)(4)] have so far failed, even when the procedure used in the case of 2-salicyloylhydrazono-1,3-dithiolane (H2L') ligand, which worked very efficiently, was employed. The new iron dinuclear m-methoxo complex (5) presented in this study shows antiferromagnetic intramolecular coupling (J = -221.1 cm(-1)), which is in agreement with the theoretical study proposed previously for its manganese analogue.