Carboxylato complexes of the uranyl ion: Effects of ligand size and coordination geometry upon molecular and crystal structure

Room temperature assembly of a uranyl carboxyphosphonate: Synthesis, characterization and UO22+ hydrolysis

“…Over the past two decades, efforts to prepare and structurally characterize a variety of UO 2 2+ -carboxylate [11][12][13][14][15][16] and -mono/ polyphosphonate [17][18][19][20][21][22][23] [27,28]. Whereas the influence of charge balancing counter cations, templates and transition metal cations on product formation has been explored, the effects of temperature on the resulting topologies and dimensionality have not been thoroughly examined.…”

The Photochemical Behavior of the Uranyl Ion (UO$\rm{{_{2}^{2+}}}$): a Dimer Perspective and Outlook

“…In solution, however, this chain could be limited to a dimeric species with a bridging oxalato ligand. Coordinated H 2 O molecules instead of the monodentate carboxylato group have also been observed in crystal structures of oxalato complexes [15].…”

“…4, has been reported in the literature for solid uranyl oxalato complexes, where one oxalato group is 1,4-coordinated to two uranyl ions. The other oxalato ligand is bidentate to one [15]. In solution, however, this chain could be limited to a dimeric species with a bridging oxalato ligand.…”

“…4. Proposed dimeric structure of uranyl oxalato complexes in solution [15] In favor of the dimer are: 1. From the photochemical point of view, the out-of-plane vibration in Fig.…”

A cis‐Dioxido Uranyl: Fluxional Carboxylate Activation from a Reversible Coordination Polymer

“…This pattern is repeated by another row of fcdc ligands that is shifted along the chain by one unit. However, whereas in uranyl(VI) polymers the linear dioxido geometry often directs equatorial coordination into extended planar sheets, [8] in 2 the cis-dioxido unit tilts the staggered rows of fcdc units nearly perpendicular to one another in an endo/endo conformation, which positions these groups for an interpenetrating network of C-H···p interactions [9] with interstitial Fc molecules (Figure 2 C). Parallel chains aligned along the a axis are thus knitted together across the b axis to form 11 thick layers that stack along the c axis, separated by longrange C-H···O = U (3.5 ) interactions [10] between a phalanx of cis-dioxido groups from one layer and a row of interstitial Fc molecules from the next layer.…”