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_4121824
_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         'Na4 Si23'
_chemical_formula_sum            'Na4 Si23'
_chemical_formula_weight         738.03
_chemical_name_systematic
;
 ?
;
_space_group_IT_number           223
_symmetry_cell_setting           cubic
_symmetry_Int_Tables_number      223
_symmetry_space_group_name_Hall  '-P 4n 2 3'
_symmetry_space_group_name_H-M   'P m -3 n'
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_conform_dict_location     ftp://ftp.iucr.org/pub/cif_core.dic
_audit_conform_dict_name         cif_core.dic
_audit_conform_dict_version      2.3
_audit_creation_date             2013-01-12T17:49:24-00:00
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   10.2004(4)
_cell_length_b                   10.2004(4)
_cell_length_c                   10.2004(4)
_cell_measurement_reflns_used    0
_cell_measurement_temperature    293
_cell_measurement_theta_max      0
_cell_measurement_theta_min      0
_cell_measurement_wavelength     0.71073
_cell_volume                     1061.33(7)
_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      293
_diffrn_detector_area_resol_mean 'not relevant'
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Rigakau CCD Mercury'
_diffrn_measurement_method       'phi and kai scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.0714
_diffrn_reflns_av_unetI/netI     0.0237
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            7256
_diffrn_reflns_theta_full        27.36
_diffrn_reflns_theta_max         27.36
_diffrn_reflns_theta_min         4
_exptl_absorpt_coefficient_mu    1.431
_exptl_absorpt_correction_T_max  0.867
_exptl_absorpt_correction_T_min  0.759
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details   'Rigaku CrystalClear'
_exptl_crystal_colour            black
_exptl_crystal_density_diffrn    2.309
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             732
_exptl_crystal_size_max          0.2
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.1
_refine_diff_density_max         0.501
_refine_diff_density_min         -0.376
_refine_diff_density_rms         0.094
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.053
_refine_ls_matrix_type           full
_refine_ls_number_parameters     15
_refine_ls_number_reflns         243
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.053
_refine_ls_R_factor_all          0.0316
_refine_ls_R_factor_gt           0.0282
_refine_ls_shift/su_max          0
_refine_ls_shift/su_mean         0
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0521P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0755
_refine_ls_wR_factor_ref         0.0781
_reflns_number_gt                209
_reflns_number_total             243
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja502733e_si_007.cif
_cod_data_source_block           Na8Si46
_cod_depositor_comments
'Adding full bibliography for 4121822--4121827.cif.'
_cod_database_code               4121824