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Title: Amine-Templated Cobalt(II) Coordination Polymer Exhibiting Novel Magnetic Properties: Effect of Dehydration
Authors: Nagaraja, C M
Kumar, Nitesh
Maji, Tapas Kumar
Rao, C N R
Keywords: Coordination polymers
Magnetic properties
Hard magnets
Canted antiferromagnets
Single-Crystal Transformation
Molecule-Based Magnet
Canted Antiferromagnetism
Weak Ferromagnetism
Kagome Lattice
Metal Sulfates
Issue Date: May-2011
Publisher: Wiley-Blackwell
Citation: European Journal of Inorganic Chemistry (13), 2057-2063 (2011)
Abstract: An amine-templated 2D coordination polymer of Co(II) with the formula {[EDAH(2)][Co(2)F(2)(SO(4))(2)(H(2)O)(2)]}(n) (1) (EDA = ethylenediamine), has been synthesised and structurally characterised. It consists of a 1D chain bridged by F(-) ions, which are interconnected by SO(4)(2-) tetrahedra forming a 2D [Co(2)F(2)(SO(4))(2)(H(2)O)(2)](n)(2-) corrugated sheet. The diprotonated cation [EDAH2] is intercalated between the sheets. Temperature-dependent magnetic measurements reveal the presence of spin-canted antiferromagnetism and hard-magnet-like behaviour with large a magnetic hysteresis with a coercive field (H(c)) of 16.2 kOe and a remnant magnetisation (M(R)) of 1.64 mu(B). The coordinated water molecules in 1 can be removed by heating at 250 C under vacuum to obtain the dehydrated phase {[EDAH(2)][Co(2)F(2)(SO(4))(2)]}(n) (1'), which - upon exposure to water vapour for 24 h - gave the monoaqua compound, {[EDAH(2)][Co(2)F(2)(SO(4))(2)(H(2)O)]}(n) (1 ''). This dehydration/rehydration process is accompanied by a structural transformation and a magnetic phase transition between the spin-canted antiferromagnetic state of the hydrated phase to the antiferromagnetic state of the dehydrated phase.
Description: Restricted Access
Other Identifiers: 1434-1948
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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