22 Space-group changes
Clemente, Dore Augusto; Marzotto, Armando; Acta Crystallographica Section B 59 (2003) 43–50; doi:10.1107/S0108768102022668

data_2103795
_publ_section_title
;
 22 Space-group changes
;
_journal_issue                   1
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              43
_journal_page_last               50
_journal_paper_doi               10.1107/S0108768102022668
_journal_volume                  59
_journal_year                    2003
_chemical_formula_sum            'C10 Br4 N4 O2 U'
_chemical_formula_weight         765.81
_chemical_name_systematic
;
Tetrabromo-bis(N,N,N',N'-tetramethylurea)-uranium(iv)
;
_space_group_IT_number           15
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.00
_cell_angle_beta                 117.52(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   16.764(5)
_cell_length_b                   8.710(4)
_cell_length_c                   16.655(3)
_cell_measurement_temperature    293(2)
_cell_volume                     2156.7(13)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.285
_diffrn_measured_fraction_theta_max 0.285
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71070
_diffrn_reflns_av_R_equivalents  0.0077
_diffrn_reflns_av_sigmaI/netI    0.0587
_diffrn_reflns_limit_h_max       26
_diffrn_reflns_limit_h_min       -26
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            9718
_diffrn_reflns_theta_full        50.56
_diffrn_reflns_theta_max         50.56
_diffrn_reflns_theta_min         2.71
_exptl_absorpt_coefficient_mu    14.941
_exptl_crystal_density_diffrn    2.359
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             1344
_refine_diff_density_max         0.372
_refine_diff_density_min         -0.355
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.388
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     42
_refine_ls_number_reflns         3303
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.388
_refine_ls_R_factor_all          0.0046
_refine_ls_R_factor_gt           0.0044
_refine_ls_shift/su_max          1.266
_refine_ls_shift/su_mean         0.030
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0000P)^2^+0.0089P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0211
_refine_ls_wR_factor_ref         0.0326
_reflns_number_gt                3198
_reflns_number_total             3303
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            an0613.cif
_cod_data_source_block           farniv
_cod_original_cell_volume        2156.7(12)
_cod_original_sg_symbol_H-M      'C 2/c'
_cod_database_code               2103795