Uranyl ion complexation by the tripodal ligand nitrilotriacetate

Filling the equatorial garland of uranyl ion: its content and limitations

“…the sheets, are hydrogen bonded to carboxylate groups and water molecules [NO 2.710(14)-3.041(11) Å, N-HO 122-172°]. Few uranyl ion complexes involving nitrilotriacetate are known, none involving U-N coordination; where the central nitrogen atom is protonated, the three carboxylate groups are monodentate and a monoperiodic ribbon-like coordination polymer is formed[55,56] while, in the presence of additional Ni(II) cations, a triperiodic framework is obtained[57] in which the nta 3is bound in a tridentate ONO manner to Ni(II) and interactions with the uranyl ions involve carboxylate groups only through monodentate and 2- 1 O: 1 Oʹ coordination.…”