Ladder distyrylbenzenes with silicon and chalcogen bridges: synthesis, structures, and properties.
Mouri, Kazuhiro; Wakamiya, Atsushi; Yamada, Hiroshi; Kajiwara, Takashi; Yamaguchi, Shigehiro; Organic letters 9 (2007) 93–96; doi:10.1021/ol062615s

data_1505242
_publ_section_title
;
 Ladder distyrylbenzenes with silicon and chalcogen bridges: synthesis,
 structures, and properties.
;
_journal_issue                   1
_journal_name_full               'Organic letters'
_journal_page_first              93
_journal_page_last               96
_journal_paper_doi               10.1021/ol062615s
_journal_volume                  9
_journal_year                    2007
_chemical_formula_sum            'C26 H22 Se2 Si2'
_chemical_formula_weight         548.54
_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                90.0000(10)
_cell_angle_beta                 90.8205(10)
_cell_angle_gamma                90.0000(10)
_cell_formula_units_Z            4
_cell_length_a                   8.8891(16)
_cell_length_b                   9.8528(18)
_cell_length_c                   26.162(5)
_cell_measurement_temperature    123(2)
_cell_volume                     2291.1(7)
_computing_molecular_graphics    'ORTEP 3 for windows'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      123(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type
;
Saturn70 CCD (4x4 bin mode) with MicroMax-007
;
_diffrn_measurement_method       dtprofit.ref
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71070
_diffrn_reflns_av_R_equivalents  0.0316
_diffrn_reflns_av_sigmaI/netI    0.0277
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -31
_diffrn_reflns_number            14669
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         2.41
_exptl_absorpt_coefficient_mu    3.344
_exptl_absorpt_correction_T_max  0.8506
_exptl_absorpt_correction_T_min  0.6339
_exptl_absorpt_correction_type   empirical
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.590
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1096
_exptl_crystal_size_max          0.15
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.522
_refine_diff_density_min         -0.429
_refine_diff_density_rms         0.074
_refine_ls_extinction_coef       none
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.080
_refine_ls_hydrogen_treatment    none
_refine_ls_matrix_type           full
_refine_ls_number_parameters     275
_refine_ls_number_reflns         4035
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.080
_refine_ls_R_factor_all          0.0353
_refine_ls_R_factor_gt           0.0282
_refine_ls_shift/su_max          0.003
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0371P)^2^+0.2935P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0652
_refine_ls_wR_factor_ref         0.0688
_reflns_number_gt                3528
_reflns_number_total             4035
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol062615ssi20061024_092930.cif
_cod_data_source_block           5c
_cod_original_sg_symbol_H-M      P21/n
_cod_database_code               1505242