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@ARTICLE{Li:850015,
      author       = {Li, Haijian and Kegler, Philip and Bosbach, Dirk and
                      Alekseev, Evgeny},
      title        = {{H}ydrothermal {S}ynthesis, {S}tudy, and {C}lassification
                      of {M}icroporous {U}ranium {S}ilicates and {G}ermanates},
      journal      = {Inorganic chemistry},
      volume       = {57},
      number       = {8},
      issn         = {1520-510X},
      address      = {Washington, DC},
      publisher    = {American Chemical Society},
      reportid     = {FZJ-2018-04103},
      pages        = {4745 - 4756},
      year         = {2018},
      abstract     = {Four novel uranyl silicates and germanates with framework
                      structures, K4Na2(UO2)3(Si2O7)2·3H2O,
                      K4Na2(UO2)3(Ge2O7)2·3H2O, H3O(UO2)2(HGe2O7)·2H2O, and
                      Na2(UO2)GeO4, have been synthesized by means of the
                      hydrothermal method. The structures of the title compounds
                      were refined by single-crystal X-ray diffraction and
                      characterized by Raman spectroscopy. We used the method of
                      secondary building units (SBUs) for a crystal chemical
                      analysis of the 3D framework and their topologies. The
                      framework of the K4Na2(UO2)3(T2O7)2·3H2O (T = Si, Ge)
                      series exhibits large 14-membered rings and smaller
                      8-membered rings which are built upon [UT4] pentamers. The
                      internal size of the largest pores is approximately 12.39 ×
                      3.33 Å2. H3O(UO2)2(HGe2O7)·2H2O is based on 10-membered
                      rings with intermediate sized pores. They are built upon
                      [U2Ge2] tetramers with 7-fold-coordinated U. The internal
                      dimension of the pores in H3O(UO2)2(HGe2O7)·2H2O is smaller
                      compared to the K4Na2(UO2)3(T2O7)2·3H2O (T = Si, Ge) series
                      with ∼5.91 × 5.33 Å2. Its topology is similar to several
                      uranium germanate synthetic phases and silicate minerals,
                      especially α- and β-uranophane which are constructed from
                      similar building units. A novel 3D framework type of
                      Na2(UO2)GeO4with 8-membered rings demonstrates the smallest
                      free volume in the family of porous uranium germanates. It
                      crystallizes in tetragonal symmetry and is built upon corner
                      sharing of [UGe4] pentamers. The size of the channels is
                      ∼6.76 × 4.27 Å2. The vibrational bands in Raman spectra
                      were associated with pyro-(Si2O7)6-and -(Ge2O7)6-groups,
                      with the Ge-OH bond and with H3O+cations, confirming the
                      results of the X-ray crystallographic structural
                      characterization. We systemized existing uranyl silicates
                      and germanates based on their building units and chemical
                      composition. We found a simple structural dependence between
                      synthetic conditions and chemical composition.},
      cin          = {IEK-6},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IEK-6-20101013},
      pnm          = {161 - Nuclear Waste Management (POF3-161) / Helmholtz Young
                      Investigators Group: Energy (HGF-YIG-Energy)},
      pid          = {G:(DE-HGF)POF3-161 / G:(DE-HGF)HGF-YIG-Energy},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:29608306},
      UT           = {WOS:000430437400059},
      doi          = {10.1021/acs.inorgchem.8b00466},
      url          = {https://juser.fz-juelich.de/record/850015},
}