Abstract

The new compound UPd 2S 4 was prepared by reacting stoichiometric amounts of US 2, Pd, and S in evacuated quartz ampoules. UPd 2S 4 crystallizes in the tetragonal system, a = b = 6.734(1), c = 11.841(4)Å, space group I4 1 a , Z = 4 . The crystal structure was determined from single-crystal X-ray diffraction data and refined to a conventional R factor of 0.054. Palladium has a square planar sulfur coordination with PdS distances = 2.33 Å. Uranium is coordinated with eight sulfur atoms, with a mean US distance of 2.83 Å characteristic of uranium in the tetravalent state.

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