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ReportsSynthesis of Imido Analogs of the Uranyl IonHere we describe the synthesis of two imido analogs of the uranyl ion, UO2+2, in which the oxygens are replaced by divalent alkyl or aryl nitrogen groups: U(NtBu)2I2(THF)2 (1) and U(NPh)2I2(THF)3 (2) (where tBu is tert-butyl and THF is tetrahydrofuran). Both compounds have been fully characterized by standard analytical techniques, including x-ray crystallography, and the chemical bonding between the metal center and the nitrogen ligands was quantified by using hybrid density functional theory calculations. As expected for a uranyl analog, these complexes exhibit linear N-U-N linkages and very short U-N bonds. In addition, the theoretical calculations show strong involvement of the 5f and 6d electrons in the U-N bonding.
1 Chemistry Division, MS J514, MS B268, Los Alamos National Laboratory, Los Alamos, NM 87545, USA. * To whom correspondence should be addressed. E-mail: boncella{at}lanl.gov
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Science. ISSN 0036-8075 (print), 1095-9203 (online)
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