Flux Synthesis, Crystal Structure, and Photoluminescence of a Heterometallic Uranyl-Europium Germanate with U=O-Eu Linkage: K4[(UO2)Eu2(Ge2O7)2]
Shih-Pu Liu; Meng-Ling Chen; Bor-Chen Chang; Kwang-Hwa Lii; Inorganic Chemistry 52 (2013) 3990–3994; doi:10.1021/ic302826u

data_4334355
_publ_section_title
;
 Flux Synthesis, Crystal Structure, and Photoluminescence of a
 Heterometallic Uranyl-Europium Germanate with U=O-Eu Linkage:
 K4[(UO2)Eu2(Ge2O7)2]
;
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              3990
_journal_page_last               3994
_journal_paper_doi               10.1021/ic302826u
_journal_volume                  52
_journal_year                    2013
_chemical_formula_sum            'Eu2 Ge4 K4 O16 U'
_chemical_formula_weight         1244.71
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   none
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                94.695(2)
_cell_angle_beta                 98.659(2)
_cell_angle_gamma                110.512(2)
_cell_formula_units_Z            1
_cell_length_a                   6.9491(4)
_cell_length_b                   6.9502(4)
_cell_length_c                   9.9102(5)
_cell_measurement_temperature    296(2)
_cell_volume                     438.48(4)
_computing_molecular_graphics    Diamond
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0225
_diffrn_reflns_av_sigmaI/netI    0.0206
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            8041
_diffrn_reflns_theta_full        28.28
_diffrn_reflns_theta_max         28.28
_diffrn_reflns_theta_min         2.10
_exptl_absorpt_coefficient_mu    24.024
_exptl_absorpt_correction_T_max  0.746
_exptl_absorpt_correction_T_min  0.490
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'SADABS program'
_exptl_crystal_colour            light-yellow
_exptl_crystal_density_diffrn    4.714
_exptl_crystal_description       block
_exptl_crystal_F_000             550
_exptl_crystal_size_max          0.12
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.881
_refine_diff_density_min         -0.721
_refine_diff_density_rms         0.157
_refine_ls_extinction_coef       0.0117(2)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.100
_refine_ls_hydrogen_treatment    none
_refine_ls_matrix_type           full
_refine_ls_number_parameters     125
_refine_ls_number_reflns         2174
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.100
_refine_ls_R_factor_all          0.0155
_refine_ls_R_factor_gt           0.0148
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0115P)^2^+0.7214P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0331
_refine_ls_wR_factor_ref         0.0334
_reflns_number_gt                2098
_reflns_number_total             2174
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ic302826u_si_002.cif
_cod_data_source_block           keuugeo
_cod_original_cell_volume        438.47(4)
_cod_database_code               4334355