Conformational Control of Polysilanes: Use of CH(2) Spacers in the Silicon Backbone.
Wallner, Andreas; Hlina, Johann; Wagner, Harald; Baumgartner, Judith; Marschner, Christoph; Organometallics 30 (2011) 3930–3938; doi:10.1021/om1011159

data_4064069
_publ_section_title
;
 Conformational Control of Polysilanes: Use of CH(2) Spacers in the
 Silicon Backbone.
;
_journal_issue                   15
_journal_name_full               Organometallics
_journal_page_first              3930
_journal_page_last               3938
_journal_paper_doi               10.1021/om1011159
_journal_volume                  30
_journal_year                    2011
_chemical_formula_sum            'C20 H58 Si8'
_chemical_formula_weight         523.38
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_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-97
_cell_angle_alpha                93.09(3)
_cell_angle_beta                 111.65(3)
_cell_angle_gamma                107.06(3)
_cell_formula_units_Z            1
_cell_length_a                   9.5214(19)
_cell_length_b                   9.955(2)
_cell_length_c                   10.396(2)
_cell_measurement_reflns_used    3235
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      52.451
_cell_measurement_theta_min      5.036
_cell_volume                     860.9(4)
_computing_cell_refinement       'Bruker XSCANS'
_computing_data_collection       'Bruker XSCANS'
_computing_data_reduction        'Bruker SHELXTL'
_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      100(2)
_diffrn_measured_fraction_theta_full 0.985
_diffrn_measured_fraction_theta_max 0.985
_diffrn_measurement_device_type  'SMART APEX'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0248
_diffrn_reflns_av_sigmaI/netI    0.0419
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            6877
_diffrn_reflns_theta_full        26.31
_diffrn_reflns_theta_max         26.31
_diffrn_reflns_theta_min         2.14
_exptl_absorpt_coefficient_mu    0.319
_exptl_absorpt_correction_T_max  0.9389
_exptl_absorpt_correction_T_min  0.8830
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.010
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       blocks
_exptl_crystal_F_000             290
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.510
_refine_diff_density_min         -0.273
_refine_diff_density_rms         0.070
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.246
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     136
_refine_ls_number_reflns         3450
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.246
_refine_ls_R_factor_all          0.0631
_refine_ls_R_factor_gt           0.0558
_refine_ls_shift/su_max          0.005
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0389P)^2^+0.6571P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1118
_refine_ls_wR_factor_ref         0.1148
_reflns_number_gt                3161
_reflns_number_total             3450
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om1011159_si_001.cif
_cod_data_source_block           7_350j
_cod_original_cell_volume        860.9(3)
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               4064069