The difference of uranyl (UO22+) complexes with Nitrilotri–3–propanoic acid and Tris(2–carboxyethyl) phosphine: N–tricarboxylate versus P–tricarboxylate

4-(Ammoniomethyl)benzoate, a protic zwitterionic bifunctional linker in uranyl ion carboxylate complexes

“…This has the disadvantage of eliminating usage of the positively charged centre for strong hydrogen bonding interactions, a factor which can strongly influence the role of a zwitterionic ligand as a structure determinant. [12][13][14][15][16][17][18][19][20][21][22][23] The best known protic zwitterions are the amino acids but the known structural chemistry of their uranyl ion complexes, while showing this importance of ammonium-centre hydrogen bonding, is very limited, involving only glycine, [24][25][26] alanine 25 and proline. 27 This paucity of information is due, in our experience, to reactions, both under solvothermal or mild ambient conditions and in the presence or absence of light, of most amino acids in the presence of uranyl ion which result in their decomposition.…”