A Stable Push-Pull Disilene: Substantial Donor-Acceptor Interactions through the Si=Si Double Bond.
Kosai, Tomoyuki; Iwamoto, Takeaki; Journal of the American Chemical Society  (2017) –; doi:10.1021/jacs.7b09989

data_4126806
_publ_section_title
;
 A Stable Push-Pull Disilene: Substantial Donor-Acceptor Interactions
 through the Si=Si Double Bond.
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_paper_doi               10.1021/jacs.7b09989
_journal_year                    2017
_chemical_formula_moiety         'C36 H68 K N O Si4'
_chemical_formula_sum            'C38 H68 K N O Si4'
_chemical_formula_weight         706.39
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2yn'
_space_group_name_H-M_alt        'P 1 21/n 1'
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_sites_solution_hydrogens   mixed
_audit_creation_method           SHELXL-2014
_cell_angle_alpha                90
_cell_angle_beta                 95.7970(10)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   9.4328(3)
_cell_length_b                   15.3231(6)
_cell_length_c                   28.7059(10)
_cell_measurement_reflns_used    9969
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      32.90
_cell_measurement_theta_min      2.21
_cell_volume                     4127.9(3)
_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  0.0335
_diffrn_reflns_av_unetI/netI     0.0216
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 1.000
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       37
_diffrn_reflns_limit_l_min       -37
_diffrn_reflns_number            61072
_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         27.499
_diffrn_reflns_theta_min         1.426
_exptl_absorpt_coefficient_mu    0.273
_exptl_absorpt_correction_T_max  0.7465
_exptl_absorpt_correction_T_min  0.6630
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'SADABS Sheldrick 1996'
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.137
_exptl_crystal_description       plate
_exptl_crystal_F_000             1544
_exptl_crystal_size_max          0.100
_exptl_crystal_size_mid          0.100
_exptl_crystal_size_min          0.100
_refine_diff_density_max         0.580
_refine_diff_density_min         -0.429
_refine_diff_density_rms         0.054
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.026
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     545
_refine_ls_number_reflns         9490
_refine_ls_number_restraints     6
_refine_ls_restrained_S_all      1.028
_refine_ls_R_factor_all          0.0572
_refine_ls_R_factor_gt           0.0438
_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^)+(0.0551P)^2^+3.1690P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1086
_refine_ls_wR_factor_ref         0.1210
_reflns_Friedel_coverage         0.000
_reflns_number_gt                7673
_reflns_number_total             9490
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja7b09989_si_002.cif
_cod_data_source_block           Compound_3__TK25a_a
_cod_database_code               4126806
_shelx_estimated_absorpt_t_min   0.973
_shelx_estimated_absorpt_t_max   0.973
_shelxl_version_number           2014-3
_shelx_res_checksum              76378
_shelx_hkl_checksum              55059