Abstract
A powder of deuterated rubidium diselenatouranylate dihydrate Rb2UO2(SeO4)2 · 2D2O has been studied by neutron diffraction. The compound is orthorhombic, space group Pna21, with the following unit cell parameters: a = 13.654(2) A, b = 11.863(2) A, c = 7.625(1) A, Z = 4, RF = 3.77, RI = 6.12, and χ2 = 2.21. Basic structure units are [UO2(SeO4)2 · D2O]2− layers belonging to the AB22M1 crystal-chemical group (A = UO22+, B2 = SeO42−, M1 = D2O) of uranyl complexes. The hydrogen atoms if the water molecules involved in the layer form intralayer hydrogen bonds with the terminal oxygen atoms of selenate ions. The outer-sphere water molecules are coordinated to the rubidium ions and are involved in hydrogen bonding with oxygen atoms of neighboring [UO2(SeO4)2 · D2O]2− layers.
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