Abstract: A novel layered oxouranium phosphite open-structure [(C10H24N2)(H2O)][(UO2)2(HPO3)3](denoted as TJPU-8, TJPU=Tianjin Polytechnic University) was hydrothermally synthesized with isophorondiamine(IPDA) as the template. Single crystal structure refinement disclosed that TJPU-8 crystallized in the monoclinic space group P21c with cell parameters a=1.8346(9) nm, b=0.6734(1) nm, c=2.0639(0) nm, β=114.61(5)°, V=2.3182(8) nm3, Z=2. TJPU-8 was constructed by UO7 monomer, U2O12 dimer and HPO3 groups. The monomeric UO7 or dimeric U2O12 was connected by HPO3 groups to form two types of 4-ring chains. An undulating sheet was then generated by connecting these two types of chains via HPO3 bridges. The layer structure formed by stacking the sheets along the a direction via the strong H-bonds of organoamine cations and water molecules intercalated in the interlayer spaces with the framework oxygen atoms. Although a mixture of cis- and trans-IPDA was used, only cis-IPDA served as the template. A typical green light emission of TJPU-8 is observed when excited by 266 nm laser.

Key words: Hydrothermal synthesis, Open-framework compound, Single crystal structure, Oxouranium phosphite