Hydrothermal synthesis and characterization of a new 3D-network containing the versatile cis,cis-cyclohexane-1,3,5-tricarboxylate
- 22 June 2001
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry
- Vol. 11 (9) , 2146-2151
- https://doi.org/10.1039/b101531l
Abstract
The hydrothermal synthesis, characterization, single crystal X-ray structures and magnetic properties of three-dimensional coordination polymers, [M3(CTC)2(μ-H2O)2(H2O)2]·5(H2O) (1: M = Co, 2: M = Ni), employing the flexible cis,cis-cyclohexane-1,3,5-tricarboxylate (CTC or C9H9O6 3−) are described. X-Ray crystal structure analyses reveal that 1 and 2 are isostructural. They belong to the triclinic system, P: a = 7.799(2), b = 9.212(1), c = 10.784(2) Å, α = 107.595(3), β = 92.877(3), γ = 110.248(3)°, V = 682.4(2) Å3 and Z = 2 for 1, and a = 7.694(1), b = 9.210(1), c = 10.764(2) Å, α = 108.598(3), β = 92.300(3), γ = 109.814(3)°, V = 670.6(2) Å3 and Z = 2 for 2. They consist of trinuclear motifs of pseudo-octahedral MO6 linked through μ-OH2 and μ-carboxylate to generate one-dimensional chains, which are further bridged by the tricarboxylate to form a non-interpenetrated three-dimensional network. The network possesses extended channels along all three crystallographic axes in which water molecules reside. Each carboxylate group displays a different coordination mode to the metals. The temperature dependence of the magnetic susceptibilities indicates dominant antiferromagnetic interaction within the trimer of the cobalt complex, tending towards a ferrimagnetic alignment at low temperatures, and mostly ferromagnetic interactions for the nickel complex.Keywords
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