Two heterometallic uranium oxyfluorides with hybrid networks were hydrothermally synthesized by incorporating two imidazoles, 1-（biphenyl-4-yl）-lH-imidazole （bpi） and 1,4-di（1H-imidazol-l-yl）ben- zene （dib）, f...Two heterometallic uranium oxyfluorides with hybrid networks were hydrothermally synthesized by incorporating two imidazoles, 1-（biphenyl-4-yl）-lH-imidazole （bpi） and 1,4-di（1H-imidazol-l-yl）ben- zene （dib）, formulated as Zn（bpi）2（UO2）2（H2O）F6 （1） and Zn（dib）（UO2）F4-0.5H20 （2）. Compound 1 consists of chains of edge-sharing UO2F5 and UO2F4（H20） pentagonal bipyramids, which are linked by Zn（bpi）2 moieties to form the sheet structure with decorated bpi. While in compound 2, sheets of edge- sharing dimers of UO2F5 pentagonal bipyramids and ZnF3N2 polyhedra are linked by dib, creating a pillared three-dimensional framework. The two compounds represent the few examples of heterometallic uranium oxyfluorides incorporating organic ligands. The syntheses, structure as well as the IR spectra, UV-vis spectra and luminescent properties of the bimetallic uranium oxyfluorides are studied.展开更多
Hydrothermal reactions of uranyl nitrate and 4,4＇-oxidiphthalic acid（H4L） resulted in the formation of three new uranyl-organic framework materials,namely（NH4）2[（UO2）3（L）2]·5H2O（1）,（NEt4）[（UO2）3（...Hydrothermal reactions of uranyl nitrate and 4,4＇-oxidiphthalic acid（H4L） resulted in the formation of three new uranyl-organic framework materials,namely（NH4）2[（UO2）3（L）2]·5H2O（1）,（NEt4）[（UO2）3（H2O）（L）（HL）]（2） and（UO2）7（H2O）2（phen）4（L）2（HL）2（3）（NEt4 = tetraethylammonium,phen = 1,10-phenanthroline）.These three structures all comprise common uranyl pentagonal bipyramids.In 1,UO7polyhedra are linked by hexadentate ligands to form a 3D framework with 1D channels,in which are located NH4^＋ ions and water molecules.While in 2,the organic ligands adopt pentadentate and hexadentate coordination modes,ligating UO7 units to create a layered structure with channels filled by NEt4^＋ ions.For 3,uranyl square bipyramids are also accommodated together with pentagonal bipyramids,which are linked by tetradentate carboxylate ligands to produce the layered assembly.Phen molecules also coordinate to the uranyl centers to build up the structure.Luminescent studies indicate that 2 and 3 exhibit the characteristic uranyl emission.展开更多
基金supported by National Nature Science Foundation of China (Nos.21301168,21171162 and U1407101)Jilin Province Youth Foundation (Nos.20130522123JH and 20130522132JH)
文摘Two heterometallic uranium oxyfluorides with hybrid networks were hydrothermally synthesized by incorporating two imidazoles, 1-（biphenyl-4-yl）-lH-imidazole （bpi） and 1,4-di（1H-imidazol-l-yl）ben- zene （dib）, formulated as Zn（bpi）2（UO2）2（H2O）F6 （1） and Zn（dib）（UO2）F4-0.5H20 （2）. Compound 1 consists of chains of edge-sharing UO2F5 and UO2F4（H20） pentagonal bipyramids, which are linked by Zn（bpi）2 moieties to form the sheet structure with decorated bpi. While in compound 2, sheets of edge- sharing dimers of UO2F5 pentagonal bipyramids and ZnF3N2 polyhedra are linked by dib, creating a pillared three-dimensional framework. The two compounds represent the few examples of heterometallic uranium oxyfluorides incorporating organic ligands. The syntheses, structure as well as the IR spectra, UV-vis spectra and luminescent properties of the bimetallic uranium oxyfluorides are studied.
基金the support of this work by National Natural Science Foundation of China(Nos.21571171,21301168,U1407101)Jilin Province Youth Foundation(No.20130522123JH)
文摘Hydrothermal reactions of uranyl nitrate and 4,4＇-oxidiphthalic acid（H4L） resulted in the formation of three new uranyl-organic framework materials,namely（NH4）2[（UO2）3（L）2]·5H2O（1）,（NEt4）[（UO2）3（H2O）（L）（HL）]（2） and（UO2）7（H2O）2（phen）4（L）2（HL）2（3）（NEt4 = tetraethylammonium,phen = 1,10-phenanthroline）.These three structures all comprise common uranyl pentagonal bipyramids.In 1,UO7polyhedra are linked by hexadentate ligands to form a 3D framework with 1D channels,in which are located NH4^＋ ions and water molecules.While in 2,the organic ligands adopt pentadentate and hexadentate coordination modes,ligating UO7 units to create a layered structure with channels filled by NEt4^＋ ions.For 3,uranyl square bipyramids are also accommodated together with pentagonal bipyramids,which are linked by tetradentate carboxylate ligands to produce the layered assembly.Phen molecules also coordinate to the uranyl centers to build up the structure.Luminescent studies indicate that 2 and 3 exhibit the characteristic uranyl emission.
