Molecular architecture based on manganese triangles: Monomer, dimer, and one-dimensional polymer

The reaction of salicylaldoxime (H(2)salox) with MnCl2 center dot 4H(2)O and NEt4OH in MeOH affords the trinuclear manganese complex (NEt4)[Mn3O(salox)(3)(MeOH)(2)(H2O)(2)Cl-2]center dot MeOH (1.MeOH). A similar reaction of 1.MeOH was carried out using MnBr(2 center dot)4H(2)O to obtain the hexanuclear manganese complex (NEt4)(3) [NaBr2[Mn3O(salox)(3)(H2O)(4)Br-2](2)) (2). The reaction of 2-hydroxy-4-methoxybenzaldehyde oxime (4-MeO-H(2)salox) and Mn(ClO4)(2)center dot 6H(2)O with 1,2-di(4-pyridyl)ethylene (dpe) in MeOH/DMF mixtures yields the one-dimensional complex {[Mn3O(4-MeOsalox)(3)(dpe)(1.5)(DMF)(2)(H2O)](ClO4)}(n) (3 center dot DMF center dot H2O). Complex 1.MeOH shows a typical structure of a [(Mn3O)-O-III](7+) core, and complex 2 contains a dimer [(Mn3O)-O-III](7+) core connected by a Na+ ion. Complex 3 has a one-dimensional chain structure constructed from [Mn-3(III)](7+) units linked by dpe ligands. Magnetic analysis shows that all three complexes exhibit antiferromagnetic interactions between the Mn-III ions. (C) 2011 Elsevier Ltd. All rights reserved.