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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 14, Number 6
BKCSDE 14(6)
June 20, 1993 

Synthesis and Crystal Structure of UP2S6
Junghwan Do, Jungwook Kim, Sangmoo Lah, Hoseop Yun
The new ternary phase UP2S6 has been prepared and structurally characterized. The compound is isostructural with ZrP2S6 and ThP2S6 but is different from TiP2S6. The structure has been determined by a single crystal X-ray diffraction technique. UP2S6 crystallizes in the the tetragonal system (C24h-P42/m, a=6.797(7) Å, c=9.738(12) Å) with two formula units in the unit cell. The structure can be described in terms of U4+ and P2S64- ions. This hexathiohypodiphosphate anion (P2S64-) has ideally staggered conformation. The U4+ cation is coordinated by 8 sulfur atoms in a slightly distorted dodecahedral geometry (42m). The distribution of sulfur atoms is very well optimized for this geometry.
678 - 681
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