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_4064073
_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            'C22 H62 Si8'
_chemical_formula_weight         551.44
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 103.36(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   15.188(3)
_cell_length_b                   9.960(2)
_cell_length_c                   25.704(5)
_cell_measurement_reflns_used    5305
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      52.511
_cell_measurement_theta_min      4.909
_cell_volume                     3783.1(14)
_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 1.000
_diffrn_measured_fraction_theta_max 1.000
_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  0.0690
_diffrn_reflns_av_sigmaI/netI    0.0540
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -28
_diffrn_reflns_number            11475
_diffrn_reflns_theta_full        23.50
_diffrn_reflns_theta_max         23.50
_diffrn_reflns_theta_min         1.63
_exptl_absorpt_coefficient_mu    0.293
_exptl_absorpt_correction_T_max  0.9172
_exptl_absorpt_correction_T_min  0.8794
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    0.968
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       blocks
_exptl_crystal_F_000             1224
_exptl_crystal_size_max          0.45
_exptl_crystal_size_mid          0.36
_exptl_crystal_size_min          0.30
_refine_diff_density_max         0.913
_refine_diff_density_min         -0.419
_refine_diff_density_rms         0.109
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.353
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     145
_refine_ls_number_reflns         2791
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.353
_refine_ls_R_factor_all          0.0987
_refine_ls_R_factor_gt           0.0930
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0599P)^2^+27.5688P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1980
_refine_ls_wR_factor_ref         0.2011
_reflns_number_gt                2649
_reflns_number_total             2791
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om1011159_si_001.cif
_cod_data_source_block           12_349j
_cod_original_cell_volume        3783.1(13)
_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               4064073