Abstract
Recently, Toivonen and Niinisto reported that UO2SO4·(urea)2 is capable of existing in two crystalline forms. The structures of these are very similar, with the uranium atom lying at the center of a pentagonal bipyramid formed by oxygen atoms. Of the five equatorial oxygens, three belong to sulfate groups and two to urea molecules: The bridging tridentate sulfate groups (labeled as 3,4,5) join the bipyramids into infinite double chains, and the α and β polymorphs differ in how these chains are packed.
© 1984 Optical Society of America
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