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_4131212
_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         'C52 H108 Si13'
_chemical_formula_sum            'C52 H108 Si13'
_chemical_formula_weight         1098.55
_space_group_crystal_system      monoclinic
_space_group_IT_number           15
_space_group_name_Hall           '-C 2yc'
_space_group_name_H-M_alt        'C 1 2/c 1'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2014
_cell_angle_alpha                90
_cell_angle_beta                 117.0350(10)
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   36.907(4)
_cell_length_b                   19.699(2)
_cell_length_c                   20.897(2)
_cell_measurement_reflns_used    9120
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      28.51
_cell_measurement_theta_min      2.34
_cell_volume                     13533(2)
_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_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  0.0166
_diffrn_reflns_av_unetI/netI     0.0114
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 1.000
_diffrn_reflns_limit_h_max       45
_diffrn_reflns_limit_h_min       -45
_diffrn_reflns_limit_k_max       24
_diffrn_reflns_limit_k_min       -24
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            69301
_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         26.000
_diffrn_reflns_theta_min         1.426
_exptl_absorpt_coefficient_mu    0.278
_exptl_absorpt_correction_T_max  0.9863
_exptl_absorpt_correction_T_min  0.9728
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'SADABS Sheldrick 1996'
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.078
_exptl_crystal_description       plate
_exptl_crystal_F_000             4816
_exptl_crystal_size_max          0.100
_exptl_crystal_size_mid          0.100
_exptl_crystal_size_min          0.050
_refine_diff_density_max         0.559
_refine_diff_density_min         -0.501
_refine_diff_density_rms         0.048
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.056
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     625
_refine_ls_number_reflns         13299
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.056
_refine_ls_R_factor_all          0.0345
_refine_ls_R_factor_gt           0.0297
_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^)+(0.0436P)^2^+17.1272P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0805
_refine_ls_wR_factor_ref         0.0879
_reflns_Friedel_coverage         0.000
_reflns_number_gt                11931
_reflns_number_total             13299
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja6b11912_si_002.cif
_cod_data_source_block           Compound1_si360b
_cod_original_sg_symbol_H-M      'C 2/c'
_cod_database_code               4131212
_shelx_estimated_absorpt_t_min   0.973
_shelx_estimated_absorpt_t_max   0.986
_shelxl_version_number           2014-3
_shelx_res_checksum              91803
_shelx_hkl_checksum              44853