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Previously, a crystal structure of hexa-DMF cobalt(II) complex [Co(DMF)6](BPh4)2 (DMF = N,N-dimethylformamide) was determined,1 and its coordination geometry around cobalt(II) ion was found to be trigonally compressed. The distortion of this type is related to the splitting pattern of the ground term caused by the spin-orbit coupling;2 controlling the distortion leads to controlling the magnetic behavior. Moreover, the structure of the complex could be approximated to a rather rare S6 point group. In this study we studied a dimethylsulfoxide (DMSO) derivative with the aim of revealing its structural feature: symmetry and distortion. A DMSO derivative was prepared by refluxing a DMSO solution (2.0 ml) of cobalt(II) nitrate hexahydrate (1.0 mmol, 0.29 g) for 0.5 hour; also, the addition of a DMSO solution of sodium tetraphenylborate (2.0 mmol, 0.68 g) resulted in the precipitation of purple microcrystals. Single-crystals suitable for X-ray analysis were obtained by recrystallization of the microcrystals from DMSO. The crystal data are included in Table 1. The structure was solved by direct methods and expanded using Fourier techniques. The non-hydrogen atoms were refined anisotropically, and hydrogen atoms were refined using the riding model. The final cycle of full-matrix least-squares refinement on F2 was let to satisfactory converge with R1 = 0.0539 [I > 2s(I)]. The crystal consists of complex cations [Co(DMSO)6] and tetraphenylborate anions in a 1:2 molar ratio. Although several complexes containing [Co(DMSO)6] have been reported,3–6 the present tetraphenylborate derivative has not been reported. The chemical structure is shown in Fig. 1, and an ORTEP view for the complex cation is shown in Fig. 2. In the complex cation, X-ray Structure Analysis Online

x-ray structure analysis online

Structural Feature of a Hexa-DMSO Cobalt(II) Complex: &lt;i&gt;Pseudo&lt;/i&gt;-&lt;i&gt;S&lt;/i&gt;&lt;sub&gt;6&lt;/sub&gt; Symmetry and &lt;i&gt;Pseudo&lt;/i&gt;-&lt;i&gt;C&lt;/i&gt;&lt;sub&gt;2v&lt;/sub&gt; Deformation