Syntheses and crystal structures of benzohexathia[7]helicene and naphthalene cored double helicene.
Wang, Zhihua; Shi, Jianwu; Wang, Jiange; Li, Chunli; Tian, Xinyong; Cheng, Yanxiang; Wang, Hua; Organic letters 12 (2010) 456–459; doi:10.1021/ol902613g

data_1503370
_publ_section_title
;
 Syntheses and crystal structures of benzohexathia[7]helicene and
 naphthalene cored double helicene.
;
_journal_issue                   3
_journal_name_full               'Organic letters'
_journal_page_first              456
_journal_page_last               459
_journal_paper_doi               10.1021/ol902613g
_journal_volume                  12
_journal_year                    2010
_chemical_formula_sum            'C24 H22 S6 Si2'
_chemical_formula_weight         558.96
_chemical_name_common            compd-1
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   8.9624(8)
_cell_length_b                   19.1122(18)
_cell_length_c                   31.228(3)
_cell_measurement_reflns_used    4866
_cell_measurement_temperature    294(2)
_cell_measurement_theta_max      24.50
_cell_measurement_theta_min      2.50
_cell_volume                     5349.1(9)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_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      294(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'CCD area 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  0.0368
_diffrn_reflns_av_sigmaI/netI    0.0301
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -22
_diffrn_reflns_limit_l_max       37
_diffrn_reflns_limit_l_min       -33
_diffrn_reflns_number            21907
_diffrn_reflns_theta_full        25.50
_diffrn_reflns_theta_max         25.50
_diffrn_reflns_theta_min         2.50
_exptl_absorpt_coefficient_mu    0.613
_exptl_absorpt_correction_T_max  0.8422
_exptl_absorpt_correction_T_min  0.7870
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            pink
_exptl_crystal_density_diffrn    1.388
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             2320
_exptl_crystal_size_max          0.41
_exptl_crystal_size_mid          0.35
_exptl_crystal_size_min          0.29
_refine_diff_density_max         0.307
_refine_diff_density_min         -0.409
_refine_diff_density_rms         0.049
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.030
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     311
_refine_ls_number_reflns         4970
_refine_ls_number_restraints     30
_refine_ls_restrained_S_all      1.047
_refine_ls_R_factor_all          0.0589
_refine_ls_R_factor_gt           0.0411
_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^)+(0.0368P)^2^+4.0609P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0875
_refine_ls_wR_factor_ref         0.0972
_reflns_number_gt                3809
_reflns_number_total             4970
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol902613g_si_002.cif
_cod_data_source_block           c
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      Pbca
_cod_database_code               1503370