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Highly selective extraction of the uranyl ion with hydrophobic amidoxime-functionalized ionic liquids via η2 coordination

“…37 All structures consist of uranyl ions with equatorial coordination numbers of six. The uranyl complexes are either anionic with three anionic ligands in hexagonal bipyramidal fashion [38][39][40][41] or neutral with two anionic and two neutral ligands in pseudo-octahedral geometry. [42][43][44] The bond distances of all three reported amidoximate structures are within standard error when compared to the average bond distances of all structures showing side-on oximate coordination (average values of 2.35(6), 2.41(8), and 1.39(5) A ˚for U-O, U-N, and O-N, respectively).…”