Novel Example of a Chain Structure Formed by 1,4-Dioxane and Cobalt(II) Links. Chain [Co<sub>3</sub>(μ-OOCCF<sub>3</sub>)<sub>4</sub>(μ-H<sub>2</sub>O)<sub>2</sub>(OOCCF<sub>3</sub>)<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>(C<sub>4</sub>H<sub>8</sub>O<sub>2</sub>)]·2C<sub>4</sub>H<sub>8</sub>O<sub>2</sub>
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The trimer [Co3(μ-OOCCF3)4(μ-H2O)2(OOCCF3)2(H2O)2(C4H8O2)]·2C4H8O2 (1) is composed of three tetragonally distorted CoII centers bridged by four trifluoroacetates and two bridging water molecules. 1,4-Dioxane is coordinated at a distance of 2.120(3) Å from the terminal cobalt Co2; the remaining oxygen of this 1,4-dioxane links the terminal cobalt to a neighbor trimer, forming a one-dimensional chain. The crystal structure displays a network of hydrogen bonds between four noncoordinated 1,4-dioxane molecules and the coordinated terminal water molecules. The magnetic properties of 1 were analyzed with the use of the Hamiltonian including isotropic exchange interactions between real spins of a high-spin CoII, spin−orbit coupling and a low-symmetry crystal field acting within the 4T1g ground manifold of each cobalt ion. A weak antiferromagnetic exchange interaction between cobalt ions in 1 was found. The results of the magnetic model are in good agreement with the experimental observations.
