Synthesis and Chiroptical Properties of Double-Helical (M)- and (P)-o-Oligophenylenes.
Chen, Jing-Xing; Han, Jian-Wei; Wong, Henry N. C.; Organic letters 17 (2015) 4296–4299; doi:10.1021/acs.orglett.5b02102

data_1555243
_publ_section_title
;
 Synthesis and Chiroptical Properties of Double-Helical (M)- and
 (P)-o-Oligophenylenes.
;
_journal_issue                   17
_journal_name_full               'Organic letters'
_journal_page_first              4296
_journal_page_last               4299
_journal_paper_doi               10.1021/acs.orglett.5b02102
_journal_volume                  17
_journal_year                    2015
_chemical_absolute_configuration ad
_chemical_formula_sum            'C26 H18 Br2 O2'
_chemical_formula_weight         522.22
_space_group_IT_number           20
_space_group_name_Hall           'C 2c 2'
_space_group_name_H-M_alt        'C 2 2 21'
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_H-M   'C 2 2 21'
_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                   9.5385(15)
_cell_length_b                   16.362(3)
_cell_length_c                   14.106(2)
_cell_measurement_reflns_used    2188
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      45.485
_cell_measurement_theta_min      4.979
_cell_volume                     2201.5(6)
_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      293(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_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  0.0923
_diffrn_reflns_av_sigmaI/netI    0.0760
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -20
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            6029
_diffrn_reflns_theta_full        25.99
_diffrn_reflns_theta_max         25.99
_diffrn_reflns_theta_min         2.47
_exptl_absorpt_coefficient_mu    3.702
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.30781
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.576
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prismatic
_exptl_crystal_F_000             1040
_exptl_crystal_size_max          0.369
_exptl_crystal_size_mid          0.337
_exptl_crystal_size_min          0.231
_refine_diff_density_max         0.592
_refine_diff_density_min         -0.317
_refine_diff_density_rms         0.081
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.031(18)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.928
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     137
_refine_ls_number_reflns         2169
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.928
_refine_ls_R_factor_all          0.0562
_refine_ls_R_factor_gt           0.0455
_refine_ls_shift/su_max          0.029
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0524P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1026
_refine_ls_wR_factor_ref         0.1057
_reflns_number_gt                1709
_reflns_number_total             2169
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            (S.S)-5.cif
_cod_data_source_block           cd29459
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_symmetry_cell_setting' value 'Orthorhombic' was changed
to 'orthorhombic' in accordance with the
/home/saulius/struct/COD-crude-data/automatic-downloads/DataCite-retrospective/ACS/depositions/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 last updated on
2011-04-26.

Automatic conversion script
Id: cif_fix_values 6909 2019-04-08 15:41:33Z antanas 
;
_cod_original_sg_symbol_H-M      C222(1)
_cod_database_code               1555243