Bis(catecholato)silanes: assessment, rationale and increase of silicon’s Lewis superacidity
Hartmann, Deborah; Schädler, Marcel; Greb, Lutz; Chemical Science  (2019) –; doi:10.1039/C9SC02167A

data_1551464
_publ_section_title
;
 Bis(catecholato)silanes: assessment, rationale and increase of
 silicon&#x2019;s Lewis superacidity
;
_journal_name_full               'Chemical Science'
_journal_paper_doi               10.1039/C9SC02167A
_journal_year                    2019
_chemical_formula_moiety         'C20 H20 Br8 O6 Si'
_chemical_formula_sum            'C20 H20 Br8 O6 Si'
_chemical_formula_weight         1023.73
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_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     dual
_audit_creation_date             2019-01-23
_audit_creation_method
;
Olex2 1.2
(compiled 2018.05.29 svn.r3508 for OlexSys, GUI svn.r5506)
;
_audit_update_record
;
2019-03-26 deposited with the CCDC.    2019-06-17 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 93.00(3)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   8.6390(17)
_cell_length_b                   9.5980(19)
_cell_length_c                   17.384(4)
_cell_measurement_reflns_used    751
_cell_measurement_temperature    120
_cell_measurement_theta_max      26
_cell_measurement_theta_min      1.0
_cell_volume                     1439.5(5)
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2015)'
_computing_structure_solution    'ShelXT (Sheldrick, 2015)'
_diffrn_ambient_temperature      120
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.981
_diffrn_measurement_device_type  'NONIUS Kappa CCD'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0635
_diffrn_reflns_av_unetI/netI     0.0861
_diffrn_reflns_Laue_measured_fraction_full 0.993
_diffrn_reflns_Laue_measured_fraction_max 0.981
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            11000
_diffrn_reflns_point_group_measured_fraction_full 0.993
_diffrn_reflns_point_group_measured_fraction_max 0.981
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         28.000
_diffrn_reflns_theta_min         2.346
_exptl_absorpt_coefficient_mu    11.219
_exptl_absorpt_correction_T_max  1.0
_exptl_absorpt_correction_T_min  0.689058
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    2.362
_exptl_crystal_description       cube
_exptl_crystal_F_000             964
_exptl_crystal_size_max          0.45
_exptl_crystal_size_mid          0.45
_exptl_crystal_size_min          0.4
_refine_diff_density_max         0.788
_refine_diff_density_min         -0.886
_refine_diff_density_rms         0.196
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.993
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     162
_refine_ls_number_reflns         3415
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.993
_refine_ls_R_factor_all          0.0814
_refine_ls_R_factor_gt           0.0404
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0204P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0618
_refine_ls_wR_factor_ref         0.0709
_reflns_Friedel_coverage         0.000
_reflns_number_gt                2309
_reflns_number_total             3415
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c9sc02167a2.cif
_cod_data_source_block           ms125a
_cod_database_code               1551464
_shelx_shelxl_version_number     2018/3
_shelx_estimated_absorpt_t_max   0.094
_shelx_estimated_absorpt_t_min   0.081
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H,H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Secondary CH2 refined with riding coordinates:
 C7(H7A,H7B), C9(H9A,H9B)
2.b Idealised Me refined as rotating group:
 C8(H8A,H8B,H8C), C10(H10A,H10B,H10C)
;
_shelx_res_checksum              29210
_olex2_submission_special_instructions 'No special instructions were received'