Moderate supercritical synthesis as a facile route to mixed-valent uranium(iv,v) and (v,vi) silicates.
Pace, Kristen A.; Klepov, Vladislav V.; Morrison, Gregory; Zur Loye, Hans-Conrad; Chemical communications (Cambridge, England) 54 (2018) 13794–13797; doi:10.1039/c8cc07789d

data_7122503
_publ_section_title
;
 Moderate supercritical synthesis as a facile route to mixed-valent
 uranium(iv,v) and (v,vi) silicates.
;
_journal_issue                   98
_journal_name_full
'Chemical communications (Cambridge, England)'
_journal_page_first              13794
_journal_page_last               13797
_journal_paper_doi               10.1039/c8cc07789d
_journal_volume                  54
_journal_year                    2018
_chemical_formula_moiety         '0.25(Na4 O44 Rb8 Si8 U8)'
_chemical_formula_sum            'Na O11 Rb2 Si2 U2'
_chemical_formula_weight         902.17
_space_group_crystal_system      orthorhombic
_space_group_IT_number           56
_space_group_name_Hall           '-P 2ab 2ac'
_space_group_name_H-M_alt        'P c c n'
_symmetry_space_group_name_Hall  '-P 2ab 2ac'
_symmetry_space_group_name_H-M   'P c c n'
_audit_creation_date             2018-06-26
_audit_creation_method
;
Olex2 1.2
(compiled 2018.05.29 svn.r3510 for OlexSys, GUI svn.r5506)
;
_audit_update_record
;
2018-06-26 deposited with the CCDC.
2018-10-24 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   13.6169(4)
_cell_length_b                   7.3529(2)
_cell_length_c                   11.4921(4)
_cell_measurement_reflns_used    9141
_cell_measurement_temperature    300(2)
_cell_measurement_theta_max      36.34
_cell_measurement_theta_min      2.32
_cell_volume                     1150.63(6)
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2015)'
_computing_structure_solution    'SHELXT 2014/5 (Sheldrick, 2014)'
_diffrn_ambient_temperature      300.01
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0572
_diffrn_reflns_av_unetI/netI     0.0167
_diffrn_reflns_Laue_measured_fraction_full 0.997
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            90680
_diffrn_reflns_point_group_measured_fraction_full 0.997
_diffrn_reflns_point_group_measured_fraction_max 0.999
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         33.128
_diffrn_reflns_theta_min         3.546
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    36.812
_exptl_absorpt_correction_T_max  0.2740
_exptl_absorpt_correction_T_min  0.0862
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2016/2 (Bruker,2016) was used for absorption correction.
wR2(int) was 0.1622 before and 0.0836 after correction.
The Ratio of minimum to maximum transmission is 0.3146.
The \l/2 correction factor is Not present.
;
_exptl_crystal_colour            black
_exptl_crystal_density_diffrn    5.208
_exptl_crystal_description       hexagonal
_exptl_crystal_F_000             1540
_exptl_crystal_size_max          0.143
_exptl_crystal_size_mid          0.108
_exptl_crystal_size_min          0.02
_refine_diff_density_max         2.539
_refine_diff_density_min         -2.803
_refine_diff_density_rms         0.390
_refine_ls_extinction_coef       0.00165(12)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL-2018/3 (Sheldrick 2018)'
_refine_ls_goodness_of_fit_ref   1.232
_refine_ls_hydrogen_treatment    undef
_refine_ls_matrix_type           full
_refine_ls_number_parameters     86
_refine_ls_number_reflns         2193
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.232
_refine_ls_R_factor_all          0.0261
_refine_ls_R_factor_gt           0.0256
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0268P)^2^+11.8519P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0636
_refine_ls_wR_factor_ref         0.0639
_reflns_Friedel_coverage         0.000
_reflns_number_gt                2156
_reflns_number_total             2193
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c8cc07789d2.cif
_cod_data_source_block           Rb2Na[(UO2)2(Si2O7)]
_cod_depositor_comments
'Adding full bibliography for 7122499--7122503.cif.'
_cod_database_code               7122503
_shelx_estimated_absorpt_t_max   0.526
_shelx_estimated_absorpt_t_min   0.077
_olex2_refinement_description
;
;
_shelx_res_checksum              15642
_olex2_submission_special_instructions 'No special instructions were received'