New Isolable Dialkylsilylene and Its Isolable Dimer That Equilibrate in Solution
Takashi Abe; Ryoji Tanaka; Shintaro Ishida; Mitsuo Kira; Takeaki Iwamoto; Journal of the American Chemical Society 134 (2012) 20029–20032; doi:10.1021/ja310391m

data_4119013
_publ_section_title
;
 New Isolable Dialkylsilylene and Its Isolable Dimer That Equilibrate in
 Solution
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              20029
_journal_page_last               20032
_journal_paper_doi               10.1021/ja310391m
_journal_volume                  134
_journal_year                    2012
_chemical_formula_sum            'C48 H72 Si10'
_chemical_formula_weight         929.96
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           68
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-C 2a 2ac'
_symmetry_space_group_name_H-M   'C c c a :2'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.8248(19)
_cell_length_b                   25.228(4)
_cell_length_c                   17.106(3)
_cell_measurement_reflns_used    6247
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      27.92
_cell_measurement_theta_min      2.24
_cell_volume                     5103.0(15)
_computing_cell_refinement       'APEX2 (Bruker AXS, 2006)'
_computing_data_collection       'APEX2 (Bruker AXS, 2006)'
_computing_data_reduction        'SAINT (Bruker AXS, 2004)'
_computing_molecular_graphics    'XSHEL (Bruker AXS,2002)'
_computing_publication_material  'XCIF (Bruker AXS, 2001)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 8.333
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_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  0.0374
_diffrn_reflns_av_sigmaI/netI    0.0282
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       29
_diffrn_reflns_limit_k_min       -30
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            11388
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         2.24
_exptl_absorpt_coefficient_mu    0.290
_exptl_absorpt_correction_T_max  0.9857
_exptl_absorpt_correction_T_min  0.9857
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details
;
SADABS Sheldrick 1996
;
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    1.210
_exptl_crystal_description       block
_exptl_crystal_F_000             2000
_exptl_crystal_size_max          0.05
_exptl_crystal_size_mid          0.05
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.634
_refine_diff_density_min         -0.240
_refine_diff_density_rms         0.065
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.083
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     140
_refine_ls_number_reflns         2250
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.083
_refine_ls_R_factor_all          0.0409
_refine_ls_R_factor_gt           0.0352
_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^)+(0.0560P)^2^+5.8319P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0925
_refine_ls_wR_factor_ref         0.0985
_reflns_number_gt                1983
_reflns_number_total             2250
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja310391m_si_002_1.cif
_cod_data_source_block           si310a_disilene
_cod_original_cell_volume        5103.0(14)
_cod_original_sg_symbol_H-M      'C c c a'
_cod_database_code               4119013