Syntheses and Crystal Structures of Fused Thiophenes: [7]Helicene and Double Helicene, a D2-Symmetric Dimer of 3,3'-Bis(dithieno[2,3-b:3',2'-d]thiophene)
Chunli Li; Jianwu Shi; Li Xu; Yangguang Wang; Yanxiang Cheng; Hua Wang; Journal of Organic Chemistry 74 (2009) 408–411; doi:10.1021/jo802080g

data_4024242
_publ_section_title
;
Syntheses and Crystal Structures of Fused Thiophenes: [7]Helicene and
Double Helicene, a D2-Symmetric Dimer of
3,3'-Bis(dithieno[2,3-b:3',2'-d]thiophene)
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              408
_journal_page_last               411
_journal_paper_doi               10.1021/jo802080g
_journal_volume                  74
_journal_year                    2009
_chemical_formula_sum            'C44 H40 S12 Si4'
_chemical_formula_weight         1065.84
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                74.483(16)
_cell_angle_beta                 78.083(18)
_cell_angle_gamma                85.768(19)
_cell_formula_units_Z            2
_cell_length_a                   10.928(10)
_cell_length_b                   14.441(14)
_cell_length_c                   18.117(18)
_cell_measurement_reflns_used    795
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      18.22
_cell_measurement_theta_min      2.30
_cell_volume                     2695(4)
_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      296(2)
_diffrn_measured_fraction_theta_full 0.989
_diffrn_measured_fraction_theta_max 0.989
_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  0.2167
_diffrn_reflns_av_sigmaI/netI    0.7223
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            13494
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         2.38
_exptl_absorpt_coefficient_mu    0.605
_exptl_absorpt_correction_T_max  0.9589
_exptl_absorpt_correction_T_min  0.9309
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            Organge
_exptl_crystal_density_diffrn    1.313
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Needle
_exptl_crystal_F_000             1104
_exptl_crystal_size_max          0.12
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.07
_refine_diff_density_max         1.120
_refine_diff_density_min         -0.485
_refine_diff_density_rms         0.131
_refine_ls_extinction_coef       0.02482(11)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.010
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     542
_refine_ls_number_reflns         9381
_refine_ls_number_restraints     204
_refine_ls_restrained_S_all      1.000
_refine_ls_R_factor_all          0.3988
_refine_ls_R_factor_gt           0.1351
_refine_ls_shift/su_max          0.012
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2525
_refine_ls_wR_factor_ref         0.3675
_reflns_number_gt                2069
_reflns_number_total             9381
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo802080g_si_005.cif
_cod_data_source_block           njy1
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from
2010-06-29.

'_exptl_absorpt_correction_type' value 'Multi-scan' changed
to 'multi-scan' according to
'/home/saulius/struct/CIF-dictionaries/cif_core.dic' dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 
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_cod_original_sg_symbol_H-M      P-1
_cod_database_code               4024242