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Synthesis and Structure of the Rubidium Uranium Selenophosphate Rb4U2P5Se17

Authors

  • Brian J. Bellott,

    1. Department of Chemistry, Northwestern University, 2145 Sheridan Rd.Evanston, IL 60208–3113, USA
    2. Department of Chemistry, Western Illinois University, 1 University Circle, Macomb IL 61455–1367, USA
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  • James A. Ibers

    Corresponding author
    1. Department of Chemistry, Northwestern University, 2145 Sheridan Rd.Evanston, IL 60208–3113, USA
    • Department of Chemistry, Northwestern University, 2145 Sheridan Rd.Evanston, IL 60208–3113, USA, Fax: +1-847-491-2976
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Abstract

Black crystals of the rubidium uranium selenophosphate Rb4U2P5Se17 have been prepared by the solid-state reaction of uranium, P2Se5, and Rb2Se3 at 1023 K. The compound crystallizes with four formula units in the triclinic space group Pequation image with cell constants at 100 K of a =10.0824(2), b = 10.6905(2), c = 15.7845(3) Å, α = 84.678(1), β = 76.125(1), γ = 85.874(1)°. Its complex three-dimensional structure displays four different types of ligands that bridge uranium atoms. Three are P2Se64– anions in different bonding modes and the fourth is an asymmetric Se22– dianion. The compound may be written Rb4U2(P2Se6)2.5(Se2) and is charge-balanced as a U4+ compound.

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