Construction of Three‐Dimensional Uranyl–Organic Frameworks with Benzenetricarboxylate Ligands

Three new uranyl–organic coordination frameworks (UO 2 ) 3 ( v ‐BTC) 2 (H 2 O) 4 ( 1 ), (UO 2 ) 6 O(OH)( m ‐BTC) 2 ( m ‐HBTC) 2 (H 2 O) 2 (H 3 O) · 6H 2 O ( 2 ), and (UO 2 ) 2 O( m ‐BTC)[NH 2 (CH 3 ) 2 ] 2 · H 2 O ( 3 ), where v ‐BTC = 1,2,3‐benzenetricarboxylate and m ‐BTC = 1,2,4‐benzenetricarboxylate, have been prepared under hydrothermal conditions. All three compounds possess three‐dimensional (3D) architectures. The adjacent carboxylate groups attached to the aromatic ring in the ligands result in strong steric hindrance, and, therefore, they are forced to orient themselves vertically to the aromatic ring. This conformation contributes to the formation of the 3D structures to a great extent. Among these three compounds, 1 has a dense structure, whereas compounds 2 and 3 possess channels that can accommodate water and/or protonated dimethylamine species. Further investigations reveal a microporous adsorption property of compound 2 and a photovoltaic response of compound 3 .