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Uranyl interactions: The title compound is the first example of an actinide compound that contains three different actinyl-ion coordination geometries, namely, octahedral, pentagonal bipyramidal, and hexagonal bipyramidal. Strong cation–cation interactions between the uranyl ions lead to pentamers with a rather unusual configuration (see picture; U dark gray, O light gray).
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Alekseev et al. (2006) studied this question.
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