Triple-armed aliphatic tricarboxylic acids as sources of ligands for uranyl ion: influence of bridgehead functionalization

Abstract

The two triple-armed species tris(2-carboxyethyl)nitromethane (H3tcenm) and tris(2-carboxyethyl)phosphine (H3tcep) have been used to synthesize seven uranyl ion complexes under (solvo)-hydrothermal conditions and in the presence of various structure-directing cations. The...

Ligand competition on uranyl ion: further examples of zwitterionic vs. anionic carboxylate coordination

“…Here also, although the U–O bond lengths involving bcebp are within the range defined by those with tcenm 3− , calculation of BV parameters fits the trend previously found (Table 3). As in complexes where the zwitterion is not present, 20 the two independent UO 2 (tcenm) − units, with both the metal and ligand being 3-c nodes, form inequivalent but almost identical, close-to-planar diperiodic polymer sheets parallel to (001), which have the point symbol {6 3 } and the hcb topological type. The nitro groups project at an angle of near 80° to the mean plane, all being located on the same side of a given sheet.…”