A higher yielding route for T8 silsesquioxane cages and X-ray crystal structures of some novel spherosilicates
Bassindale, Alan R.; Liu, Zhihua; MacKinnon, Iain A.; Taylor, Peter G.; Yang, Yuxing; Light, Mark E.; Horton, Peter N.; Hursthouse, Michael B.; Dalton Transactions  (2003) 2945–; doi:10.1039/b302950f

data_7012954
_publ_section_title
;
 A higher yielding route for T8 silsesquioxane cages and X-ray crystal
 structures of some novel spherosilicates
;
_journal_issue                   14
_journal_name_full               'Dalton Transactions'
_journal_page_first              2945
_journal_paper_doi               10.1039/b302950f
_journal_year                    2003
_chemical_formula_sum            'C64 H120 O28 Si8'
_chemical_formula_weight         1562.32
_chemical_name_systematic
; 
? 
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                106.2590(10)
_cell_angle_beta                 109.9200(10)
_cell_angle_gamma                101.9080(10)
_cell_formula_units_Z            2
_cell_length_a                   14.3683(3)
_cell_length_b                   18.0913(4)
_cell_length_c                   18.3397(4)
_cell_measurement_temperature    120(2)
_cell_volume                     4055.20(16)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      120(2)
_diffrn_measured_fraction_theta_full 0.940
_diffrn_measured_fraction_theta_max 0.940
_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  0.0645
_diffrn_reflns_av_sigmaI/netI    0.1015
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            30226
_diffrn_reflns_theta_full        25.03
_diffrn_reflns_theta_max         25.03
_diffrn_reflns_theta_min         3.17
_exptl_absorpt_coefficient_mu    0.207
_exptl_absorpt_correction_T_max  0.9597
_exptl_absorpt_correction_T_min  0.9597
_exptl_crystal_density_diffrn    1.279
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             1680
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.541
_refine_diff_density_min         -0.335
_refine_diff_density_rms         0.065
_refine_ls_extinction_coef       0.0012(2)
_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   0.975
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     926
_refine_ls_number_reflns         13466
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.975
_refine_ls_R_factor_all          0.0996
_refine_ls_R_factor_gt           0.0495
_refine_ls_shift/su_max          0.005
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0489P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1000
_refine_ls_wR_factor_ref         0.1162
_reflns_number_gt                8566
_reflns_number_total             13466
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b302950f.txt
_cod_data_source_block           s92_c
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
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_enum 1527 2010-12-29 10:47:43Z saulius 
;
_cod_original_cell_volume        4055.20(15)
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               7012954