9-Sila-9,9''-spirobixanthene
Mague, Joel T.; Balakrishna, Maravanji S.; Venkateswaran, Ramalingam; Acta Crystallographica Section E 63 (2007) o4429–o4430; doi:10.1107/S1600536807051604

data_2216144
_publ_section_title
;
 9-Sila-9,9''-spirobixanthene
;
_journal_coeditor_code           SK3175
_journal_issue                   11
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o4429
_journal_page_last               o4430
_journal_paper_doi               10.1107/S1600536807051604
_journal_volume                  63
_journal_year                    2007
_chemical_formula_iupac          'C24 H16 O2 Si'
_chemical_formula_moiety         'C24 H16 O2 Si'
_chemical_formula_sum            'C24 H16 O2 Si'
_chemical_formula_weight         364.46
_chemical_name_common
;
10,10'-spirobi(dibenzo[b,e][1,4]oxa)silane
;
_chemical_name_systematic
;
9-Sila-9,9''-spirobixanthene
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_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                 92.7560(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.7975(7)
_cell_length_b                   11.4290(7)
_cell_length_c                   14.0515(9)
_cell_measurement_reflns_used    4009
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      29.09
_cell_measurement_theta_min      2.60
_cell_volume                     1732.01(19)
_computing_cell_refinement       'APEX2 (Bruker, 2007)'
_computing_data_collection       'APEX2 (Bruker, 2007)'
_computing_data_reduction        'SAINT-Plus (Bruker, 2006)'
_computing_molecular_graphics    'APEX2 (Bruker, 2007)'
_computing_publication_material  'APEX2 (Bruker, 2007)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.991
_diffrn_measurement_device_type  'Bruker SMART APEX CCD area-detector'
_diffrn_measurement_method       '\f and \w 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  0.0375
_diffrn_reflns_av_sigmaI/netI    0.0249
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            31348
_diffrn_reflns_theta_full        28.87
_diffrn_reflns_theta_max         28.87
_diffrn_reflns_theta_min         2.30
_exptl_absorpt_coefficient_mu    0.153
_exptl_absorpt_correction_T_max  0.9824
_exptl_absorpt_correction_T_min  0.8810
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(TWINABS; Sheldrick, 2007)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.398
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             760
_exptl_crystal_size_max          0.28
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.424
_refine_diff_density_min         -0.260
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.044
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     245
_refine_ls_number_reflns         4517
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.044
_refine_ls_R_factor_all          0.0434
_refine_ls_R_factor_gt           0.0367
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.047P)^2^+0.6911P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0929
_refine_ls_wR_factor_ref         0.0976
_reflns_number_gt                3962
_reflns_number_total             4517
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            sk3175.cif
_cod_data_source_block           IV
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
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 

The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
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        1732.0(2)
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2216144
_cod_database_fobs_code          2216144