Synthesis and Properties of U-Ag Heterometallic Complex from Semi-rigid Carboxylic Ligand
In order to further study the coordination behavior of actinides,a three-dimensional U-Ag heterometal-lic complex[(L)(HL)Ag(UO2)](UAgL)was synthesized by the semi-rigid carboxylic acid ligand H2L,where H2L is 3-(carboxymethoxy)benzoic acid.The crystal structure of complex UAgL was characterized by X-ray sin-gle crystal diffraction,IR spectrum,UV spectrum and X-ray powder diffraction.The uranium atom in complex UAgL is in a slightly distorted pentagonal bipyramidal coordination environment,while the silver atom is in a pen-tagonal bipyramidal coordination environment.The oxygen atom from the UO22+also coordinates to silver atom and it is located in the axial position.The fully deprotonated ligand L and partially deprotonated ligand HL adopt two coordination modes to connect the uranium center and silver center into a two-dimensional layered structure,which is then connected by uranyl oxygen atoms to form a three-dimensional network structure.The thermal stabil-ity of the complex UAgL and its solid-state fluorescence properties was further investigated at room temperature.UAgL can be used as a future photoluminescent material.
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