Helically Annelated and Cross-Conjugated Oligothiophenes: Asymmetric Synthesis, Resolution, and Characterization of a Carbon-Sulfur [7]Helicene
Andrzej Rajca; Makoto Miyasaka; Maren Pink; Hua Wang; Suchada Rajca; Journal of the American Chemical Society 126 (2004) 15211–15222; doi:10.1021/ja0462530

data_4113182
_publ_section_title
;
 Helically Annelated and Cross-Conjugated Oligothiophenes: Asymmetric
 Synthesis, Resolution, and Characterization of a Carbon-Sulfur
 [7]Helicene
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              15211
_journal_page_last               15222
_journal_paper_doi               10.1021/ja0462530
_journal_volume                  126
_journal_year                    2004
_chemical_formula_sum            'C29 H37 Br4 Cl3 S6 Si4'
_chemical_formula_weight         1116.30
_chemical_name_common            01013b
_space_group_IT_number           60
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2n 2ab'
_symmetry_space_group_name_H-M   'P b c n'
_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            4
_cell_length_a                   19.699(2)
_cell_length_b                   13.0798(15)
_cell_length_c                   17.734(2)
_cell_measurement_temperature    173(2)
_cell_volume                     4569.3(9)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_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  0.0640
_diffrn_reflns_av_sigmaI/netI    0.0534
_diffrn_reflns_limit_h_max       23
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            26840
_diffrn_reflns_theta_full        25.06
_diffrn_reflns_theta_max         25.06
_diffrn_reflns_theta_min         1.87
_exptl_absorpt_coefficient_mu    4.099
_exptl_absorpt_correction_T_max  1.000000
_exptl_absorpt_correction_T_min  0.710979
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS 2.03 (Sheldrick, 2000)'
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.623
_exptl_crystal_description       Block
_exptl_crystal_F_000             2216
_exptl_crystal_size_max          0.21
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.13
_refine_diff_density_max         1.662
_refine_diff_density_min         -1.152
_refine_diff_density_rms         0.125
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.020
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     232
_refine_ls_number_reflns         4052
_refine_ls_number_restraints     12
_refine_ls_restrained_S_all      1.027
_refine_ls_R_factor_all          0.0796
_refine_ls_R_factor_gt           0.0488
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0421P)^2^+28.5082P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1113
_refine_ls_wR_factor_ref         0.1330
_reflns_number_gt                2945
_reflns_number_total             4052
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja0462530si20040624_110836.cif
_cod_data_source_block           01016b_macrocyclic_dimer_5
_cod_depositor_comments
;
The following automatic conversions were performed:

'_exptl_absorpt_correction_type' value 'multiscan' changed to
'multi-scan' according to the built-in table from CIF Core dictionary
named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_database_code               4113182