Please use this identifier to cite or link to this item: http://hdl.handle.net/10773/20500
Title: New manganese (II) structures derived from 2,6-dichlorobenzoic acid: Syntheses, crystal structures and magnetism
Author: Esteves, D.
Tedesco, J. C. D.
Pedro, S. S.
Cruz, C.
Reis, M. S.
Brandao, P.
Keywords: METAL-ORGANIC FRAMEWORKS
1D CHAIN
CARBOXYLATE
MN
Issue Date: 2014
Publisher: ELSEVIER SCIENCE SA
Abstract: One novel coordination polymer [Mn-2(mu-2,6-DCBA)(3)(mu(2)-CH3CO2)(2)(2H(2)O)]center dot 2H(2)O (2,6-DCBA = 2,6-dichlorobenzoato) (compound 1) has been synthesized by self-assembly of bridging ligand 2,6-dichlorobenzoic acid and manganese acetate tetrahydrate. Single crystal X-ray diffraction analysis reveals that this compound crystallizes in space group P2(1)/c with a = 10.1547(7), b = 24.5829(2), c = 12.6606(2) angstrom, beta = 93.707(3), V = 3153.9(3) angstrom(3) and Z = 4. The Mn(II) ions are connected by 2,6-DCBA and acetate group in mu-bridging mode to form 1D chains. Two water molecules are in the inter-layer space forming strong hydrogen bonds originating 2D layer structure. The preparation of this compound is very sensitive to the synthesis conditions, mainly to the solution pH and solvent yielding other two compounds 2 and 3. In compound 1 Mn(II) atoms in octahedral coordination are arranged in a zig -zag chain, with a trimeric structure repeated periodically along the chain, giving two exchange parameters: J(1) related to a syn-syn bond; and J(2) related to a bond of type anti-anti. A theoretical model was developed and then fitted to the magnetic susceptibility data, revealing an antiferromagnetic arrangement along the chain. (C) 2014 Elsevier B.V. All rights reserved.
Peer review: yes
URI: http://hdl.handle.net/10773/20500
DOI: 10.1016/j.matchemphys.2014.05.037
ISSN: 0254-0584
Publisher Version: 10.1016/j.matchemphys.2014.05.037
Appears in Collections:CICECO - Artigos



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