[PhSiO1.5]8 promotes self-bromination to produce [o-BrPhSiO1.5]8: further bromination gives crystalline [2,5-Br2PhSiO1.5]8 with a density of 2.32 g cm−3 and a calculated refractive index of 1.7 or the tetraicosa bromo compound [Br3PhSiO1.5]8
Roll, Mark F.; Mathur, Priyanka; Takahashi, Kunio; Kampf, Jeffrey W.; Laine, R. M.; Journal of Materials Chemistry 21 (2011) 11167–; doi:10.1039/c1jm11536g

data_7206356
_publ_section_title
;
 [PhSiO1.5]8 promotes self-bromination to produce [o-BrPhSiO1.5]8:
 further bromination gives crystalline [2,5-Br2PhSiO1.5]8 with a
 density of 2.32 g cm&#x2212;3 and a calculated refractive index of 1.7
 or the tetraicosa bromo compound [Br3PhSiO1.5]8
;
_journal_issue                   30
_journal_name_full               'Journal of Materials Chemistry'
_journal_page_first              11167
_journal_paper_doi               10.1039/c1jm11536g
_journal_volume                  21
_journal_year                    2011
_chemical_formula_moiety         'C48 H32 Br8 O12 Si8, 2.5(C8 H10)'
_chemical_formula_sum            'C68 H57 Br8 O12 Si8'
_chemical_formula_weight         1930.14
_chemical_name_systematic
;
?
;
_space_group_IT_number           88
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  '-I 4ad'
_symmetry_space_group_name_H-M   'I 41/a :2'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   20.5738(10)
_cell_length_b                   20.5738(10)
_cell_length_c                   36.261(4)
_cell_measurement_reflns_used    9816
_cell_measurement_temperature    85(2)
_cell_measurement_theta_max      27.96
_cell_measurement_theta_min      2.25
_cell_volume                     15349(2)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker SMART-APEX'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      85(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_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  0.0477
_diffrn_reflns_av_sigmaI/netI    0.0142
_diffrn_reflns_limit_h_max       27
_diffrn_reflns_limit_h_min       -27
_diffrn_reflns_limit_k_max       27
_diffrn_reflns_limit_k_min       -27
_diffrn_reflns_limit_l_max       48
_diffrn_reflns_limit_l_min       -48
_diffrn_reflns_number            333383
_diffrn_reflns_theta_full        28.34
_diffrn_reflns_theta_max         28.34
_diffrn_reflns_theta_min         1.79
_exptl_absorpt_coefficient_mu    4.362
_exptl_absorpt_correction_T_max  0.3686
_exptl_absorpt_correction_T_min  0.2779
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
Blessing, R. Acta Cryst. (1995) A51 33-38.
Sheldrick, G. SADABS (Version 2008/1) Bruker AXS area
detector absorption and other corrections, University of
Gottingen, Germany 2008.
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.671
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       octahedron
_exptl_crystal_F_000             7624
_exptl_crystal_size_max          0.33
_exptl_crystal_size_mid          0.28
_exptl_crystal_size_min          0.23
_refine_diff_density_max         0.994
_refine_diff_density_min         -1.329
_refine_diff_density_rms         0.121
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.089
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     490
_refine_ls_number_reflns         9574
_refine_ls_number_restraints     262
_refine_ls_restrained_S_all      1.078
_refine_ls_R_factor_all          0.0626
_refine_ls_R_factor_gt           0.0526
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0828P)^2^+2.2331P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1460
_refine_ls_wR_factor_ref         0.1530
_reflns_number_gt                8392
_reflns_number_total             9574
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c1jm11536g.txt
_cod_data_source_block           obr8a
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Tetragonal' changed to 'tetragonal'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_cell_volume        15348.5(19)
_cod_original_sg_symbol_H-M      I4(1)/a
_cod_database_code               7206356