Journal
POLYHEDRON
Volume 24, Issue 16-17, Pages 2242-2249Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.poly.2005.03.085
Keywords
copper(II); manganese(II); coordination polymers; pyridinedicarboxylates; magnetism
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Two heterobimetallic coordination polymers, [Cu(2,4-pyd)(2)Mn(H2O)(4)], (1) and [Cu(2,5-pydc)(2)Mn(H2O)(2)](x) center dot 4xH(2)O (2), have been synthesized and structurally characterized by single crystal X-ray diffraction. Both compounds have extended 2-D sheet structures. In 1 the copper centers are linked in chains by double ligand bridges and these chains are cross-linked through the manganese coordination spheres and O-C-O bridges to form polymeric sheets. In 2 separate O-C-O bridged Cu and n chains are connected in an alternating array by additional ligand bridging to generate the overall 2-D structure. Analysis of magnetic data of 1 reveals that ferromagnetic exchange between the O-C-0 bridged copper and manganese centers dominates the magnetic properties of this system. The magnetic data for 2 fit well to a model incorporating antiferromagnetic exchange in independent S = 1/2 and S = 5/2 linear chains with J(Cu) = -0.073 cm-1 and J(Mn) = -0.32 cm-1. Unlike the situation in 1, there is no evidence for heterometallic exchange. In both 1 and 2 the significant exchange occurs via O-C-0 bridges. To study the effect of thermal dehydration on the magnetic properties of these systems, the compounds Cu(2,4-pydc)(2)Mn (.) H2O (1d) and Cu(2,5-pydc)(2)Mn (.) H2O (2d) were synthesized and studied. @ 2005 Elsevier Ltd. All rights reserved.
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