UO22+-amino hybrid materials: structural variation and photocatalysis properties†
Abstract
Four uranyl complexes (UO2)2(μ2-OH)(μ3-OH)(his)(CH3CO2) (his = histidine) (1), [(UO2)2(μ2-OH)(μ3-OH)2(gly)]·1.5H2O (gly = glycine) (2), UO2(CH3CO2)(μ2-OH)(2,2′-bipy) (3) and UO2(CH3CO2)2(2,2′-bipy) (4) were synthesized by the reaction of UO2(CH3CO2)2·2H2O as the metal source, and histidine, glycine and 2,2′-bipy as the ligand in an aqueous system. They were characterized by elemental analysis, IR, UV-vis, single crystal X-ray diffraction analysis and thermal gravimetric analysis. The structural analysis reveals that complex 1 exhibits a one-dimensional chain structure constructed by the building unit [(UO2)4O10(C6O2N3)2], which further extends the chain into 2D supramolecular architectures by hydrogen bonding interactions. For complex 2, uranyl polyhedrons, through edge-sharing, form a 2D wave-like layer and furthermore connect by hydrogen bonding to form a 3D supramolecular structure. Complex 3 is a discrete UO2-2,2′-bipy compound UO2(CH3CO2)(OH)(2,2′-bipy). Complex 4 is also a discrete UO2-acetic-2,2′-bipy compound UO2(CH3CO2)2(2,2′-bipy) which is similar to complex 3. The adjacent molecules were respectively connected by hydrogen bonding to form a 2D supramolecular network for 3 and a 1D supramolecular chain for 4. In order to determine their functional properties, their photoluminescence was characterized and their photocatalytic properties were also studied firstly.
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