Uranium(IV) and Thorium(IV) Coordination Polymers Based on Tritopic Carboxylic Acids.

Nine new coordination polymers based on U(IV) and Th(IV) were synthesized solvothermally utilizing four different trianionic carboxylates (HBHTC = biphenyl-3,4',5-tricarboxylic acid, HNTB = 4,4',4″-nitrilotribenzoic acid, HBTB = 4,4',4″-benzene-1,3,5-triyl-tris(benzoic acid), HBTE = 4,4',4″-(1,3,5-benzenetriyltri-2,1-ethynediyl)trisbenzoic acid). The influence of the ligand architecture, the pH, the stoichiometry, the nature of the metal, and the concentration on the structure and dimensionality of the final actinide assembly is discussed. The HBHTC ligand allowed the synthesis of a cationic three-dimensional (3D) framework [U(BHTC)(DMF)]I (), which is the first example of a cationic U(IV) polymer.