Pentasila-1,4-diene: Homoconjugation between Si═Si Double Bonds via a SiMe(2) Unit.
Kosai, Tomoyuki; Ishida, Shintaro; Iwamoto, Takeaki; Journal of the American Chemical Society 139 (2017) 99–102; doi:10.1021/jacs.6b11912

data_4131216
_publ_section_title
;
 Pentasila-1,4-diene: Homoconjugation between Si&#x2550;Si Double Bonds
 via a SiMe(2) Unit.
;
_journal_issue                   1
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              99
_journal_page_last               102
_journal_paper_doi               10.1021/jacs.6b11912
_journal_volume                  139
_journal_year                    2017
_chemical_formula_moiety         'C25 H51 Si6 Cl3'
_chemical_formula_sum            'C25 H51 Cl3 Si6'
_chemical_formula_weight         626.54
_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'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2014
_cell_angle_alpha                90
_cell_angle_beta                 99.885(2)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   20.2103(14)
_cell_length_b                   8.9161(6)
_cell_length_c                   20.7174(14)
_cell_measurement_reflns_used    9730
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      29.40
_cell_measurement_theta_min      2.39
_cell_volume                     3677.8(4)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-2014 (Sheldrick 2014)'
_computing_structure_solution    'SHELXS-97 (Sheldrick 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 8.333
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker APEXII CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  'Bruker Helios multilayer confocal mirror'
_diffrn_radiation_source         'Bruker TXS fine-focus rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0481
_diffrn_reflns_av_unetI/netI     0.0295
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 1.000
_diffrn_reflns_limit_h_max       24
_diffrn_reflns_limit_h_min       -24
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            45510
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 1.000
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         25.499
_diffrn_reflns_theta_min         1.023
_exptl_absorpt_coefficient_mu    0.458
_exptl_absorpt_correction_T_max  0.9775
_exptl_absorpt_correction_T_min  0.9139
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'SADABS Sheldrick 1996'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.132
_exptl_crystal_description       plate
_exptl_crystal_F_000             1344
_exptl_crystal_size_max          0.200
_exptl_crystal_size_mid          0.050
_exptl_crystal_size_min          0.050
_platon_squeeze_details
;
;
_refine_diff_density_max         0.421
_refine_diff_density_min         -0.252
_refine_diff_density_rms         0.049
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.051
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     322
_refine_ls_number_reflns         6853
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.051
_refine_ls_R_factor_all          0.0389
_refine_ls_R_factor_gt           0.0299
_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^)+(0.0404P)^2^+0.5720P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0730
_refine_ls_wR_factor_ref         0.0760
_reflns_Friedel_coverage         0.000
_reflns_number_gt                5804
_reflns_number_total             6853
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja6b11912_si_002.cif
_cod_data_source_block           Compound5_tk03a_a
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               4131216
_shelx_estimated_absorpt_t_min   0.914
_shelx_estimated_absorpt_t_max   0.977
_shelxl_version_number           2014-3
_shelx_res_checksum              43801
_shelx_hkl_checksum              76587