Synthesis and Characterization of a Layered Uranium Phosphites

  •  Zhen Zhu    


A novel layered oxouranium phosphite open-structure [C10H24N2]?[(UO2)2(HPO3)3]?H2O (denoted as ZZ-1) was hydrothermally synthesized by using isophorondiamine (IPDA) as the template. Single crystal structure refinement discloses that ZZ-1 crystallizes in the monoclinic space group P21c with the cell parameters of a = 18.347(4)Å, b = 6.7341(13)Å, c = 20.639(4)Å, β = 114.61(3)°, V = 2318.2(8) Å3 , Z = 2. The structure of ZZ-1 is constructed by UO7 monomer, U2O12 dimer and HPO3 groups. The monomeric UO7 or dimeric U2O12 is connected by HPO3 groups to form two types of 4-ring chains. An undulating sheet is then generated by connecting these two types of chains via HPO3 bridges. The layer structure is formed by stacking the sheet along the direction with the organoamine cations and water molecules intercalated in the interlayer spaces with strong H-bonds to the framework oxygen atoms. Although a mixture of cis and trans IPDA is used, only cis PDA serves as the template. A typical green light emission of UO22+ is observed when excited by 266 nm laser.

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