Diaqua[N,N′-bis(5-methoxysalicylidene)ethylenediaminato-κ4O,N,N′,O′]manganese (III) perchlorate, aqua [N,N′-bis(3,5-dichlorosalicylidene)ethylenediaminato-κ4O,N,N′,O′](methanol-κO)manganese(III) perchlorate and bis[μ-N,N′-bis(3-methoxysalicylidene)ethylenediaminato-κ5O,N,N′,O′:O]bis[(methanol-κO)manganese(III)] diperchlorate

The title compounds, a hydrogen-bonded linear chain, [Mn( C18H18N2O4)(H2O)(2)] ClO4, ( I), a hydrogen-bonded pseudodimer, [ Mn(C16H10Cl4N2O2)(CH4O)(H2O)] ClO4, ( II), and a dimer, [Mn-2(C18H18N2O4)(2)(CH4O)(2)](ClO4)(2), ( III), respectively, have been structurally characterized. The three complexes are completely different in their structural features, despite identical counter-anions and only slight modification of the substituents in the ligands. Complex ( I) affords an elongated octahedral coordination environment, with axial Mn O( water) distances of 2.259 ( 3) and 2.313 ( 3) angstrom, which forms hydrogen-bonded linear chains along the crystallographic c axis. Hydrogen-bonded pseudo-dimeric compound ( II) also affords an elongated octahedral coordination environment, with axial Mn - O(CH3OH)= 2.222 ( 3) angstrom and Mn - O( water) = 2.266 ( 3) angstrom. Dimeric complex ( III) is centrosymmetric and consists of distorted octahedral Mn atoms, with axial Mn O( CH3OH)= 2.242 ( 2) angstrom and Mn - O( phenolate)= 2.348 ( 1) angstrom, connected via bridging O atoms from one of the ligands. The magnetic properties of the three complexes are described.