Inclusion complex between uranyl and an azacrown; structure of [UO2(18-azacrown-6)]2+.2CF3SO3−

Small molecule activation at uranium coordination complexes: control of reactivity via molecular architecture

“…With the exception of Chart 1 Selected chelating N-donor ligands for uranium coordination chemistry. our initial results in 2002 22 and an isolated report on a uranium complex of a tris-amido derivatized triazacyclononane in 2003 (Chart 2, right), 23 systematic studies on the molecular and electronic structure as well as the reactivity of uranium complexes supported by coordinated macrocyclic polyamine ligands 24 were missing from the literature. This is in contrast to the increasing amount of interesting data resulting from the thoroughly investigated organometallic chemistry of uranium with cyclopentadienyl ligands and their derivatives, as well as the more recently developed amido chemistry of uranium.…”

Theoretical Investigation on the Interactions of Isoamethyrins and AnO2+/2+ (An=U, Pu)

“…The calculated result of N−U bond length in the Diaza‐18‐crown‐6 is similar to the experimental result (0.268 nm). All the ligand‐metal interaction forces are weak . In addition, the calculation results of anionic ligands show that each ligand has a slight twist to a certain extent.…”

On the site symmetry of uranyl crown compounds in solution

“…1 Hitherto, the crystal structures of several uranyl crown ether complexes have been described in the literature, whilst studies in solution are scarce. [2][3][4][5][6][7][8][9][10][11][12][13] A lot of research on the complex formation of uranyl with crown ethers in solution was for a long time limited to empirical data. [14][15][16][17][18][19] Only the uranyl:crown ratio seemed relevant to predict the structure of the formed complexes.…”

“…In the solid state, the inclusion of the uranyl ion in a crown ether (or azacrown) of appropriate size was already demonstrated by single crystal structure determinations. 8,9,20,21 But in solution, the uranyl inclusion is in competition with the solvation of the ligand cavity, as well as with the solvation of uranyl itself. The inclusion of a metal ion into the ring depends strongly on the used solvent.…”