Exceptional Steric Congestion in an in,in-Bis(hydrosilane)
Jie Zong; Joel T. Mague; Robert A. Pascal; Journal of the American Chemical Society 135 (2013) 13235–13237; doi:10.1021/ja407398w

data_4120778
_publ_section_title
;
 Exceptional Steric Congestion in an in,in-Bis(hydrosilane)
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              13235
_journal_page_last               13237
_journal_paper_doi               10.1021/ja407398w
_journal_volume                  135
_journal_year                    2013
_chemical_formula_moiety         'C39 H32 S3 Si2, 0.5(C6 H6), C H Cl3'
_chemical_formula_sum            'C43 H36 Cl3 S3 Si2'
_chemical_formula_weight         811.43
_chemical_name_common            in,in-bis(hydrosilane)
_space_group_crystal_system      trigonal
_space_group_IT_number           147
_space_group_name_Hall           '-P 3'
_space_group_name_H-M_alt        'P -3'
_symmetry_space_group_name_Hall  '-P 3'
_symmetry_space_group_name_H-M   'P -3'
_atom_sites_solution_hydrogens   mixed
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_date             'July 12, 2013'
_audit_creation_method
;
 APEX2 v2013.4-1 and manual editing
;
_audit_update_record
;
 June 13, 2013                    Initial CIF created by JTM.

 July 12, 2013  Sent to CheckCIF  See rp059_0m_a_checkcif.pdf for alerts  
                                  that were generated. Comments on these
                                  alerts are given below.
------------------------------------------------------------------------
                ALERT level A = In general: serious problem
                ALERT level B = Potentially serious problem
                ALERT level C = Check and explain
                ALERT level G = General alerts; check
------------------------------------------------------------------------
PLAT410_ALERT_2_B Short Intra H...H Contact H1A    .. H2A     ..   1.88 Ang.

Comment/Explanation:  
     The extraordinarily close H...H contact is the point of the paper!!
------------------------------------------------------------------------
PLAT420_ALERT_2_C D-H Without Acceptor    Si1 - H1A  ...        ? Check
PLAT420_ALERT_2_C D-H Without Acceptor    Si2 - H2A  ...        ? Check

Comment/Explanation:
     Hydrosilanes are not hydrogen bond donors!!
------------------------------------------------------------------------
DIFMN02_ALERT_2_B The minimum difference density is < -0.1*ZMAX*1.00 
     _refine_diff_density_min given = -1.835
     Test value = -1.700
DIFMX01_ALERT_2_C The maximum difference density is > 0.1*ZMAX*0.75
     _refine_diff_density_max given = 1.382
     Test value = 1.275 
PLAT098_ALERT_2_B Large Reported Min. (Negative) Resid. Dens. -1.84 eA-3
PLAT097_ALERT_2_C Large Reported Max. (Positive) Resid. Dens.  1.38 eA-3
DIFMN03_ALERT_1_C The minimum difference density is < -0.1*ZMAX*0.75 
     The relevant atom site should be identified.
DIFMX02_ALERT_1_C The maximum difference density is > 0.1*ZMAX*0.75
     The relevant atom site should be identified.

Comment/Explanation:  
     The large difference density peaks are located on the C3 axis in
     the region of the included solvent molecules.  Large difference
     density peaks on special positions in trigonal and hexagonal
     space groups seem to be common artifacts of refinement. 
------------------------------------------------------------------------
PLAT340_ALERT_3_C Low Bond Precision on C-C Bonds .......... 0.0095 Ang.

Comment/Explanation:  
     The low precision bond is for the benzene included solvent only.
------------------------------------------------------------------------
RFACR01_ALERT_3_C The value of the weighted R factor is > 0.25 
     Weighted R factor given    0.254

Comment/Explanation:  
     The difference is not significant.
------------------------------------------------------------------------
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_formula_units_Z            2
_cell_length_a                   14.0183(5)
_cell_length_b                   14.0183(5)
_cell_length_c                   11.3948(5)
_cell_measurement_reflns_used    9982
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      66.7086
_cell_measurement_theta_min      3.8793
_cell_volume                     1939.22(13)
_computing_cell_refinement       '<i>SAINT</i> (Bruker AXS, 2013a)'
_computing_data_collection       '<i>APEX2</i> (Bruker AXS, 2013)'
_computing_data_reduction        '<i>SAINT</i>  (Bruker AXS, 2013a)'
_computing_molecular_graphics    '<i>DIAMOND</i> (Brandenburg & Putz, 2012)'
_computing_publication_material  '<i>SHELXTL</i> (Bruker AXS, 2008)'
_computing_structure_refinement  '<i>SHELXL-2013</i> (Sheldrick, 2013)'
_computing_structure_solution    '<i>SHELXT</i> (Bruker AXS 2013c)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 10.4167
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker D8 VENTURE PHOTON 100 CMOS'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  mirror
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_unetI/netI     0.0353
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 1.000
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            4981
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 1.000
_diffrn_reflns_theta_full        66.700
_diffrn_reflns_theta_max         66.703
_diffrn_reflns_theta_min         3.641
_diffrn_source                   'INCOATEC I\mS micro--focus source'
_exptl_absorpt_coefficient_mu    4.482
_exptl_absorpt_correction_T_max  0.98
_exptl_absorpt_correction_T_min  0.64
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '<i>TWINABS</i> (Sheldrick, 2009)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.390
_exptl_crystal_description       plate
_exptl_crystal_F_000             842
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.14
_exptl_crystal_size_min          0.02
_exptl_transmission_factor_max   0.979
_exptl_transmission_factor_min   0.639
_refine_diff_density_max         1.382
_refine_diff_density_min         -1.835
_refine_diff_density_rms         0.157
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.094
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     157
_refine_ls_number_reflns         4981
_refine_ls_number_restraints     6
_refine_ls_restrained_S_all      1.109
_refine_ls_R_factor_all          0.0905
_refine_ls_R_factor_gt           0.0822
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
;
 w=1/[\s^2^(Fo^2^)+(0.1414P)^2^+4.7553P]
 where P=(Fo^2^+2Fc^2^)/3
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2456
_refine_ls_wR_factor_ref         0.2544
_reflns_Friedel_coverage         0.000
_reflns_number_gt                4366
_reflns_number_total             4981
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja407398w_si_002.cif
_cod_data_source_block           rap059_0m_a
_cod_original_cell_volume        1939.22(16)
_cod_database_code               4120778
_shelxl_version_number           2013-2
_shelx_res_checksum              1446