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Previously, a crystal structure of the hexakis-DMSO cobalt(II) complex [Co(DMSO)6](BPh4)2 and the hexakis-DMSO nickel(II) complex [Ni(DMSO)6](BPh4)2 (DMSO = dimethylsulfoxide) were determined.1,2 Although their elemental compositions are similar, the crystal structures are significantly different, mainly because of a distortion around the cobalt(II) ion caused by the spin-orbit coupling.1 Since lanthanide complexes are another group with significant spinorbit coupling, there has been considerable interest in the magnetic properties. In this study we investigated the crystal structure of the [Ce(DMSO)8](BPh4)3 complex with the aim to reveal the relationship with the spin-orbit coupling. A cerium(III) derivative [Ce(DMSO)8](BPh4)3 was prepared by mixing cerium(III) nitrate (1.0 mmol, 0.43 g) and sodium tetraphenylborate (3.0 mmol, 1.02 g) in DMSO (5.0 ml) at room temperature for one day. The resulting white microcrystals were collected and washed with DMSO. Yield, 1.22 g (71%). Single-crystals suitable for X-ray analysis were obtained by the slow diffusion of 2-propanol to a DMSO solution of the compound. 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 a full-matrix least-squares refinement on F2 was allowed to satisfactory converge with R1 = 0.0569 [I > 2s(I)]. The final value of the Flack parameter was 0.497(7), indicating that the crystal was an inversion twin with approximately equal amounts of each twin component.3 The crystal consists of complex cations [Ce(DMSO)8] and tetraphenylborate anions in a 1:3 molar ratio. Although a complex containing [Ce(DMSO)8] has been reported,4,5 the present complex has not yet been reported. The chemical X-ray Structure Analysis Online

Structural Feature of an Octakis-DMSO Cerium(III) Complex: Tetragonal Antiprismatic Coordination Geometry along the <i>c</i> Axis