High-Pressure Synthesis and Structural Characterization of the Type II Clathrate Compound Na30.5Si136 Encapsulating Two Sodium Atoms in the Same Silicon Polyhedral Cages.
Yamanaka, Shoji; Komatsu, Masaya; Tanaka, Masashi; Sawa, Hiroshi; Inumaru, Kei; Journal of the American Chemical Society 136 (2014) 7717–7725; doi:10.1021/ja502733e

data_4121822
_publ_section_title
;
 High-Pressure Synthesis and Structural Characterization of the Type II
 Clathrate Compound Na30.5Si136 Encapsulating Two Sodium Atoms in the Same
 Silicon Polyhedral Cages.
;
_journal_issue                   21
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              7717
_journal_page_last               7725
_journal_paper_doi               10.1021/ja502733e
_journal_volume                  136
_journal_year                    2014
_chemical_compound_source        'synthesis as described'
_chemical_formula_moiety         'Na7.5 Si34'
_chemical_formula_sum            'Na7.5 Si34'
_chemical_formula_weight         1127.34
_chemical_name_systematic
;
 ?
;
_space_group_IT_number           198
_symmetry_cell_setting           cubic
_symmetry_Int_Tables_number      198
_symmetry_space_group_name_Hall  'P 2ac 2ab 3'
_symmetry_space_group_name_H-M   'P 21 3'
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.000(5)
_cell_angle_beta                 90.000(5)
_cell_angle_gamma                90.000(5)
_cell_formula_units_Z            4
_cell_length_a                   14.763(5)
_cell_length_b                   14.763(5)
_cell_length_c                   14.763(5)
_cell_measurement_reflns_used    0
_cell_measurement_temperature    10
_cell_measurement_theta_max      0
_cell_measurement_theta_min      0
_cell_volume                     3217.5(19)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Ortep-3 for Windows (Farrugia, 1997)'
_computing_publication_material  'WinGX publication routines (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR97 (Giacovazzo et al, 1997)'
_diffrn_ambient_temperature      10
_diffrn_detector_area_resol_mean 'not relevant'
_diffrn_measured_fraction_theta_full 0.984
_diffrn_measured_fraction_theta_max 0.984
_diffrn_measurement_device_type  'Brucker SMART CCD'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.0185
_diffrn_reflns_av_sigmaI/netI    0.0099
_diffrn_reflns_limit_h_max       19
_diffrn_reflns_limit_h_min       -19
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            36994
_diffrn_reflns_theta_full        28.58
_diffrn_reflns_theta_max         28.58
_diffrn_reflns_theta_min         1.38
_exptl_absorpt_coefficient_mu    1.418
_exptl_absorpt_correction_T_max  0.869
_exptl_absorpt_correction_T_min  0.762
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'Bruker SADABS'
_exptl_crystal_colour            black
_exptl_crystal_density_diffrn    2.328
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             2234
_exptl_crystal_size_max          0.2
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.1
_refine_diff_density_max         0.706
_refine_diff_density_min         -1.266
_refine_diff_density_rms         0.105
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.00
_refine_ls_extinction_coef       0.00054(6)
_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   1.087
_refine_ls_matrix_type           full
_refine_ls_number_parameters     89
_refine_ls_number_reflns         2696
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.087
_refine_ls_R_factor_all          0.0391
_refine_ls_R_factor_gt           0.0373
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0170P)^2^+13.5187P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0813
_refine_ls_wR_factor_ref         0.0826
_reflns_number_gt                2617
_reflns_number_total             2696
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja502733e_si_004.cif
_cod_data_source_block           Na30.5Si136_10K
_cod_depositor_comments
'Adding full bibliography for 4121822--4121827.cif.'
_cod_database_code               4121822