Cyclic Tetrathiophenes Planarized by Silicon and Sulfur Bridges Bearing Antiaromatic Cyclooctatetraene Core: Syntheses, Structures, and Properties
Takeshi Ohmae; Tohru Nishinaga; Mo Wu; Masahiko Iyoda; Journal of the American Chemical Society 132 (2010) 1066–1074; doi:10.1021/ja908161r

data_4101804
_publ_section_title
;
 Cyclic Tetrathiophenes Planarized by Silicon and Sulfur Bridges Bearing
 Antiaromatic Cyclooctatetraene Core: Syntheses, Structures, and
 Properties
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              1066
_journal_page_last               1074
_journal_paper_doi               10.1021/ja908161r
_journal_volume                  132
_journal_year                    2010
_chemical_formula_moiety         'C28 H36 S6 Si4'
_chemical_formula_sum            'C28 H36 S6 Si4'
_chemical_formula_weight         677.29
_chemical_name_common            2b
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 101.261(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   16.522(2)
_cell_length_b                   6.2465(8)
_cell_length_c                   16.655(2)
_cell_measurement_reflns_used    2609
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      23.28
_cell_measurement_theta_min      2.49
_cell_volume                     1685.8(4)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SHELXTL'
_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      298(2)
_diffrn_detector_area_resol_mean 8.366
_diffrn_measured_fraction_theta_full 0.971
_diffrn_measured_fraction_theta_max 0.971
_diffrn_measurement_device_type  'CCD aarea detector'
_diffrn_measurement_method       'phi and omega 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  0.0275
_diffrn_reflns_av_sigmaI/netI    0.0295
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -18
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       -6
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            5874
_diffrn_reflns_theta_full        23.28
_diffrn_reflns_theta_max         23.28
_diffrn_reflns_theta_min         1.59
_diffrn_standards_decay_%        0
_exptl_absorpt_coefficient_mu    0.567
_exptl_absorpt_correction_type   empirical
_exptl_crystal_colour            purple
_exptl_crystal_density_diffrn    1.334
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             712
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.305
_refine_diff_density_min         -0.308
_refine_diff_density_rms         0.106
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.169
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     178
_refine_ls_number_reflns         2358
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.169
_refine_ls_R_factor_all          0.0450
_refine_ls_R_factor_gt           0.0364
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0634P)^2^+0.5464P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1007
_refine_ls_wR_factor_ref         0.1164
_reflns_number_gt                2081
_reflns_number_total             2358
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja908161r_si_003.cif
_cod_data_source_block           2b
_cod_database_code               4101804