Geometrically Compelled Disilene with λ<sup>4</sup>-Coordinate Si<sup>II</sup> Atoms.
Kostenko, Arseni; Driess, Matthias; Journal of the American Chemical Society 140 (2018) 16962–16966; doi:10.1021/jacs.8b11393

data_4133583
_publ_section_title
;
 Geometrically Compelled Disilene with \l<sup>4</sup>-Coordinate
 Si<sup>II</sup> Atoms.
;
_journal_issue                   49
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              16962
_journal_page_last               16966
_journal_paper_doi               10.1021/jacs.8b11393
_journal_volume                  140
_journal_year                    2018
_chemical_formula_moiety         'C42 H54 N4 Si2'
_chemical_formula_sum            'C42 H54 N4 Si2'
_chemical_formula_weight         671.07
_space_group_crystal_system      monoclinic
_space_group_IT_number           15
_space_group_name_Hall           '-C 2yc'
_space_group_name_H-M_alt        'C 1 2/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_atom_sites_solution_secondary   difmap
_audit_creation_date             2018-10-04
_audit_creation_method
;
Olex2 1.2
(compiled 2018.05.29 svn.r3508 for OlexSys, GUI svn.r5506)
;
_cell_angle_alpha                90.00
_cell_angle_beta                 94.5089(9)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   14.12662(14)
_cell_length_b                   10.49281(11)
_cell_length_c                   25.5869(3)
_cell_measurement_reflns_used    8319
_cell_measurement_temperature    150.00(10)
_cell_measurement_theta_max      73.4590
_cell_measurement_theta_min      3.4520
_cell_volume                     3780.96(7)
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2015)'
_computing_structure_solution    'ShelXD-1997 (Sheldrick, 2008)'
_diffrn_ambient_temperature      150.00(10)
_diffrn_measured_fraction_theta_full 0.986
_diffrn_measured_fraction_theta_max 0.986
_diffrn_measurement_device       'four-circle diffractometer'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0163
_diffrn_reflns_av_unetI/netI     0.0132
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       31
_diffrn_reflns_limit_l_min       -30
_diffrn_reflns_number            13011
_diffrn_reflns_theta_full        73.59
_diffrn_reflns_theta_max         73.59
_diffrn_reflns_theta_min         3.47
_diffrn_source                   'fine-focus sealed tube'
_exptl_absorpt_coefficient_mu    1.105
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.65520
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.38.43c (Rigaku Oxford Diffraction, 2015)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            'metallic dark black'
_exptl_crystal_colour_lustre     metallic
_exptl_crystal_colour_modifier   dark
_exptl_crystal_colour_primary    black
_exptl_crystal_density_diffrn    1.179
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1448
_exptl_crystal_size_max          0.152
_exptl_crystal_size_mid          0.128
_exptl_crystal_size_min          0.044
_refine_diff_density_max         0.369
_refine_diff_density_min         -0.305
_refine_diff_density_rms         0.040
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.085
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     224
_refine_ls_number_reflns         3756
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.085
_refine_ls_R_factor_all          0.0370
_refine_ls_R_factor_gt           0.0351
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0537P)^2^+2.6349P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0985
_refine_ls_wR_factor_ref         0.1005
_reflns_number_gt                3539
_reflns_number_total             3756
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja8b11393_si_002.cif
_cod_data_source_block           cu-2517
_cod_database_code               4133583
_oxdiff_exptl_absorpt_empirical_full_min 0.807
_oxdiff_exptl_absorpt_empirical_full_max 1.616
_oxdiff_exptl_absorpt_empirical_details
;
Empirical correction (ABSPACK) includes:
- Absorption correction using spherical harmonics
- Frame scaling
;
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Secondary CH2 refined with riding coordinates:
 C16(H16A,H16B)
2.b Aromatic/amide H refined with riding coordinates:
 C6(H6), C12(H12), C13(H13), C14(H14), C15(H15), C19(H19), C20(H20)
2.c Idealised Me refined as rotating group:
 C0AA(H0AA,H0AB,H0AC), C1AA(H1AA,H1AB,H1AC), C2AA(H2AA,H2AB,H2AC), C3AA(H3AA,
 H3AB,H3AC), C4AA(H4AA,H4AB,H4AC), C5AA(H5AA,H5AB,H5AC)
;
_olex2_submission_special_instructions 'No special instructions were received'