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In coordination compounds, any distortion of the coordination geometry often plays important roles in the magnetic properties, especially when spin-orbit coupling exists.1 For the purpose of studying any distortion, the crystal structures of the hexakisDMF nickel(II) complex [Ni(DMF)6](BPh4)2 (1), the hexakisDMF cobalt(II) complex [Co(DMF)6](BPh4)2 (2), and the hexakis-DMF manganese(II) complex [Mn(DMF)6](BPh4)2 (3) [DMF = N,N-dimethylformamide] were previously determined.2–4 In all cases, the complex cations were approximated to an S6 symmetry; however, the distortion patterns of the coordination geometry were not the same. In 1 and 2, the geometry was trigonally compressed along the pseudo-S6 axis, but in 3, the geometry was trigonally compressed along a different axis. In this study, the crystal structure of a zinc(II) derivative was studied in order to determine what happens when there is no ligand field effect. A zinc derivative [Zn(DMF)6](BPh4)2 (Fig. 1) was prepared as follows: zinc(II) acetate dihydrate (0.09 g, 0.40 mmol) was dissolved in hot DMF (0.5 mL); to this was added a hot DMF solution (1.0 mL) of sodium tetraphenylborate (0.27 g, 0.80 mmol) and stirred for 2 min. After cooling, slow diffusion of 2-propanol to the reaction mixture resulted in the precipitation of colorless single-crystals suitable for X-ray analysis. The crystal data are included in Table 1. The structure was solved by direct methods and expanded using Fourier techniques. 2016 © The Japan Society for Analytical Chemistry

Crystal Structure of a Trigonally Compressed Hexakis-DMF Zinc(II) Complex