Presented here are two isostructural uranyl coordination polymers [UOe(EDO)(H2O)]· H2O (1) and [UO2(BDO)(H2O)]-2H2O (2) (EDO2---ethylene-1,2-dioxamate; BDO2 =butylene-1,2-dioxamate) with identical stepwise zigzag chain structure and distinct interchain hydrogen bonding interaction, prepared from hydrothermal reaction of DEEDO or DEBDO (DEEDO- diethyl ethylene-1,2-dioxamate; DEBDO--diethyl butylene-l,2-dioxamate) with uranyl ions. The monomeric uranyl-based fluorescence emissions of compounds 1 and 2 are red-shifted by about 6 and 5 nm respectively, compared to that of uranyl nitrate hexahydrate. Compound 1 has stronger emission than compound 2, but both their emissions exhibit triple-exponential decay. The photophysics of uranyl oxalate trihydrate was also investigated for comparison. The selective crystallization of compound 1 in alkaline solution was applied to the sequestration of uranyl ions, showing a kinetic preference.
Reported here is a water-soluble ligand, N-(sulfoethyl)-iminodiacetic acid (H3SEIDA), used for the complexation of uranyl ions. A coordination compound composed of uranyl cation and N-(sulfonatoethyl)-ammoniodiacetate (SEADA2-) zwitterion was synthesized from an acidic aqueous solution. This compound features a 2D undulating fes (4.82) coordination layer that is stacked and linked by hydrogen-bonding interaction to form a 3D supramolecular framework with a 1D larger-cycle channel. Thermal analysis demonstrates the relatively weak bonding between uranyl cation and SEADA2 zwitterion. The monomeric uranyl-based fluorescence emission is red-shifted by about thermal synthesis of this uranyl compound was successfully 5 nm compared to that of uranyl nitrate hexahydrate. The hydro- applied to the sequestration of uranyl ions.
A series of isomorphic lanthanide coordination polymers [Ln(Ⅲ)(MBP)2(NO3)2(Br)- 2C3H60] [Ln=Eu, Tb, Er, Yb, and Gd; MBP=N,N'-methylene-bis(pyridin-4-0ne)] featuring polycatenated sql cationic network and incorporated bromide counter ion were prepared. Their visible and near-infrared (NIR) luminescence properties were characterized by steady-state excitation and emission spectra, as well as luminescence lifetimes and quantum yields. The D2d dodecahedron coordination geometry causes visible light excitations and strongly monochromatic emissions. The external heavy-atom environment induces remarkable en- hancement on the NIR emissions. The sensitization processes are revealed by analyzing the electronic properties of MBP ligand.