Angle-strained sila-cycloalkynes.
Wakefield, 4th, Herbert; Melvin, Sophia J.; Jiang, Jennifer; Kevlishvili, Ilia; Siegler, Maxime A.; Craig, Stephen L.; Kulik, Heather J.; Klausen, Rebekka S.; Chemical communications (Cambridge, England) 60 (2024) 4842–4845; doi:10.1039/d4cc00439f

data_7132926
_publ_section_title
;
 Angle-strained sila-cycloalkynes.
;
_journal_issue                   36
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              4842
_journal_page_last               4845
_journal_paper_doi               10.1039/d4cc00439f
_journal_volume                  60
_journal_year                    2024
_chemical_formula_moiety         'C32 H36 Si4'
_chemical_formula_sum            'C32 H36 Si4'
_chemical_formula_weight         532.97
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-2018/3
_audit_update_record
;
2024-01-23 deposited with the CCDC.	2024-04-04 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 115.708(6)
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   24.3501(13)
_cell_length_b                   11.0409(4)
_cell_length_c                   25.4353(11)
_cell_measurement_reflns_used    4123
_cell_measurement_temperature    110(2)
_cell_measurement_theta_max      67.1520
_cell_measurement_theta_min      3.8020
_cell_volume                     6161.3(6)
_computing_cell_refinement       'CrysAlisPro 1.171.42.49 (Rigaku OD, 2022)'
_computing_data_collection       'CrysAlisPro 1.171.42.49 (Rigaku OD, 2022)'
_computing_data_reduction        'CrysAlisPro 1.171.42.49 (Rigaku OD, 2022)'
_computing_molecular_graphics    'SHELXTL v6.10 (Sheldrick, 2008)'
_computing_publication_material  'SHELXTL v6.10 (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL-2018/3 (Sheldrick, 2018)'
_computing_structure_solution    'SHELXS-2018/3 (Sheldrick, 2018)'
_diffrn_ambient_temperature      110(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'SuperNova, Dual, Cu at zero, Atlas'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  mirror
_diffrn_radiation_source         'SuperNova (Cu) X-ray Source'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0970
_diffrn_reflns_av_unetI/netI     0.0805
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       28
_diffrn_reflns_limit_h_min       -29
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       30
_diffrn_reflns_limit_l_min       -30
_diffrn_reflns_number            44958
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.999
_diffrn_reflns_theta_full        67.247
_diffrn_reflns_theta_max         67.247
_diffrn_reflns_theta_min         2.014
_exptl_absorpt_coefficient_mu    1.919
_exptl_absorpt_correction_T_max  0.943
_exptl_absorpt_correction_T_min  0.681
_exptl_absorpt_correction_type   analytical
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.42.49 (Rigaku Oxford Diffraction, 2022)
Analytical numeric absorption correction using a multifaceted crystal
model based on expressions derived by R.C. Clark & J.S. Reid.
(Clark, R. C. & Reid, J. S. (1995). Acta Cryst. A51, 887-897)
Empirical absorption correction using spherical harmonics,
implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.149
_exptl_crystal_description       needle
_exptl_crystal_F_000             2272
_exptl_crystal_size_max          0.430
_exptl_crystal_size_mid          0.044
_exptl_crystal_size_min          0.033
_refine_diff_density_max         1.549
_refine_diff_density_min         -0.303
_refine_diff_density_rms         0.094
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.995
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     657
_refine_ls_number_reflns         11030
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.995
_refine_ls_R_factor_all          0.1212
_refine_ls_R_factor_gt           0.0670
_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^)+(0.0964P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1550
_refine_ls_wR_factor_ref         0.1891
_reflns_Friedel_coverage         0.000
_reflns_number_gt                6468
_reflns_number_total             11030
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d4cc00439f2.cif
_cod_data_source_block           Si-COy
_cod_depositor_comments
'Adding full bibliography for 7132924--7132926.cif.'
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               7132926
_shelx_shelxl_version_number     2018/3
_oxdiff_exptl_absorpt_empirical_full_min 0.587
_oxdiff_exptl_absorpt_empirical_full_max 1.526
_oxdiff_exptl_absorpt_empirical_details
;
Empirical correction (ABSPACK) includes:
- Absorption correction using spherical harmonics
- Frame scaling
- Detector area scaling
- B-factor correction
;
_shelx_res_checksum              73408
_shelx_hkl_checksum              25131