Isolation of R6Si6 Dianion, a Bridged Tricyclic Isomer of Dianionic Hexasilabenzene.
Li, Yang; Li, Jianfeng; Zhang, Jianying; Song, Haibin; Cui, Chunming; Journal of the American Chemical Society  (2018) –; doi:10.1021/jacs.7b12163

data_4127046
_publ_section_title
;
 Isolation of R6Si6 Dianion, a Bridged Tricyclic Isomer of Dianionic
 Hexasilabenzene.
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_paper_doi               10.1021/jacs.7b12163
_journal_year                    2018
_chemical_formula_sum            'C54 H68 Si6'
_chemical_formula_weight         885.62
_space_group_crystal_system      triclinic
_space_group_IT_number           2
_space_group_name_Hall           '-P 1'
_space_group_name_H-M_alt        'P -1'
_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-2014/7
_cell_angle_alpha                93.629(4)
_cell_angle_beta                 91.851(4)
_cell_angle_gamma                116.420(7)
_cell_formula_units_Z            2
_cell_length_a                   12.508(4)
_cell_length_b                   13.417(4)
_cell_length_c                   16.765(4)
_cell_measurement_reflns_used    2754
_cell_measurement_temperature    113(2)
_cell_measurement_theta_max      27.4
_cell_measurement_theta_min      3.0
_cell_volume                     2508.8(13)
_computing_cell_refinement       'CrystalClear-SM Expert 2.0 r2'
_computing_data_collection       'CrystalClear-SM Expert 2.0 r2 (Rigaku, 2009)'
_computing_data_reduction        'CrystalClear-SM Expert 2.0 r2'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      113(2)
_diffrn_detector_area_resol_mean 5.8140
_diffrn_measured_fraction_theta_full 0.990
_diffrn_measured_fraction_theta_max 0.978
_diffrn_measurement_device_type  'Rigaku Saturn 724CCD camera'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  Multilayer
_diffrn_radiation_source         'Rotating Anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0757
_diffrn_reflns_av_unetI/netI     0.1097
_diffrn_reflns_Laue_measured_fraction_full 0.990
_diffrn_reflns_Laue_measured_fraction_max 0.978
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            32008
_diffrn_reflns_point_group_measured_fraction_full 0.990
_diffrn_reflns_point_group_measured_fraction_max 0.978
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.543
_diffrn_reflns_theta_min         3.046
_exptl_absorpt_coefficient_mu    0.201
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.881
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   crystalclear
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.172
_exptl_crystal_description       prism
_exptl_crystal_F_000             952
_exptl_crystal_size_max          0.220
_exptl_crystal_size_mid          0.200
_exptl_crystal_size_min          0.180
_refine_diff_density_max         0.921
_refine_diff_density_min         -0.340
_refine_diff_density_rms         0.084
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.020
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     567
_refine_ls_number_reflns         11330
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.020
_refine_ls_R_factor_all          0.1498
_refine_ls_R_factor_gt           0.0745
_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^)+(0.1000P)^2^+1.1192P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1682
_refine_ls_wR_factor_ref         0.2078
_reflns_Friedel_coverage         0.000
_reflns_number_gt                6264
_reflns_number_total             11330
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja7b12163_si_003.cif
_cod_data_source_block           m20160121c
_cod_original_cell_volume        2509.0(12)
_cod_database_code               4127046
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.957
_shelx_estimated_absorpt_t_max   0.965
_shelx_res_checksum              31795
_shelx_hkl_checksum              38271