Structures and magnetic studies of two new bimetallic chain complexes constructed by manganese(III)-(Schiff-base) and mer-tricyanidoferrate building block

Two new cyano-bridged bimetallic complexes, {[Mn-III(5-CH3)salen][Fe-III(qcq)(CN)(3)]}(n)center dot 1.85H(2)O (1) [salen = N,N'-ethylenebis(salicylideneiminato) dianion; qcq = 8-(2-quinoline-2-carboxamido)quinoline anion] and {[Mn-III(acphen)][Fe-III(qcq)(CN)(3)]}(n)center dot 6.46H(2)O (2) (acphen = bis(o-hydroxyacetophenone) ethylenediiminate), have been synthesized and characterized both structurally and magnetically. The structures of 1 and 2 are both 1-D zigzag chains connected through pi center dot center dot center dot pi stacking and short contact interactions to form extended supramolecular networks. The magnetic measurements revealed the presence of antiferromagnetic Fe-III center dot center dot center dot Mn-III interactions in 1 and 2. Interestingly, weak slow magnetic relaxation was only detected for 1, indicating the intermolecular antiferromagnetic interactions in 2 are stronger than that in 1 and lead to the disappearance of the 1-D magnetic behavior. (C) 2014 Elsevier B. V. All rights reserved.