Reduction of the dihalocyclopentasilanes. A quest for a homocyclic silylene
Xu-Qiong Xiao; Hui Zhao; Zheng Xu; Guoqiao Lai; Xiao-Lin He; Zhifang Li; Chem.Commun. 49 (2013) 2706–; doi:10.1039/c3cc00114h

data_7108994
_publ_section_title
;
 Reduction of the dihalocyclopentasilanes. A quest for a homocyclic
 silylene
;
_journal_name_full               Chem.Commun.
_journal_page_first              2706
_journal_paper_doi               10.1039/c3cc00114h
_journal_volume                  49
_journal_year                    2013
_chemical_formula_moiety         'C32 H96 Si18'
_chemical_formula_sum            'C32 H96 Si18'
_chemical_formula_weight         986.71
_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                 113.0010(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   27.289(2)
_cell_length_b                   12.4843(10)
_cell_length_c                   20.2377(16)
_cell_measurement_reflns_used    9941
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      27.45
_cell_measurement_theta_min      2.77
_cell_volume                     6346.5(9)
_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-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \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  0.0309
_diffrn_reflns_av_sigmaI/netI    0.0311
_diffrn_reflns_limit_h_max       33
_diffrn_reflns_limit_h_min       -35
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            26224
_diffrn_reflns_theta_full        27.49
_diffrn_reflns_theta_max         27.49
_diffrn_reflns_theta_min         2.28
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.379
_exptl_absorpt_correction_T_max  0.9560
_exptl_absorpt_correction_T_min  0.8949
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.033
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             2160
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.320
_refine_diff_density_min         -0.224
_refine_diff_density_rms         0.054
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.899
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     242
_refine_ls_number_reflns         7254
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.899
_refine_ls_R_factor_all          0.0488
_refine_ls_R_factor_gt           0.0359
_refine_ls_shift/su_max          0.046
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1000P)^2^+1.3003P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1114
_refine_ls_wR_factor_ref         0.1262
_reflns_number_gt                5858
_reflns_number_total             7254
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c3cc00114h.txt
_cod_data_source_block           f110510b
_cod_original_cell_volume        6346.6(9)
_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               7108994