Butane-1,4-diyl dications stabilized by steric factors: electrochiroptical response systems based on reversible interconversion between dihydro[5]helicene-type electron acceptors and electron-donating 1,1'-binaphthyls.
Ohta, Eisuke; Higuchi, Hiroki; Kawai, Hidetoshi; Fujiwara, Kenshu; Suzuki, Takanori; Organic & biomolecular chemistry 3 (2005) 3024–3031; doi:10.1039/b506435j

data_7150216
_publ_section_title
;
 Butane-1,4-diyl dications stabilized by steric factors:
 electrochiroptical response systems based on reversible
 interconversion between dihydro[5]helicene-type electron acceptors and
 electron-donating 1,1'-binaphthyls.
;
_journal_issue                   16
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              3024
_journal_page_last               3031
_journal_paper_doi               10.1039/b506435j
_journal_volume                  3
_journal_year                    2005
_chemical_formula_sum            'C58 H48 O4'
_chemical_formula_weight         809.01
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      14
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_cell_angle_alpha                90
_cell_angle_beta                 100.15(2)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   10.54(2)
_cell_length_b                   25.92(2)
_cell_length_c                   16.25(1)
_cell_measurement_reflns_used    339
_cell_measurement_temperature    153.1
_cell_measurement_theta_max      29.6
_cell_measurement_theta_min      2.0
_cell_volume                     4370(9)
_computing_cell_refinement       CRYSTALCLEAR
_computing_data_collection       CRYSTALCLEAR
_computing_data_reduction        'teXsan Ver. 1.11'
_computing_publication_material  'teXsan Ver. 1.11'
_computing_structure_refinement  'teXsan Ver. 1.10'
_computing_structure_solution    SIR92
_diffrn_detector_area_resol_mean 14.71
_diffrn_measured_fraction_theta_full 0.9323
_diffrn_measured_fraction_theta_max 0.9323
_diffrn_measurement_device_type  'Rigaku/MSC Mercury CCD'
_diffrn_measurement_method       \w
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.7107
_diffrn_reflns_av_R_equivalents  0.016
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       32
_diffrn_reflns_limit_k_min       -33
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            27052
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         27.50
_exptl_absorpt_coefficient_mu    0.076
_exptl_absorpt_correction_T_max  0.985
_exptl_absorpt_correction_T_min  0.985
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.230
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Prism
_exptl_crystal_size_max          0.200
_exptl_crystal_size_mid          0.200
_exptl_crystal_size_min          0.200
_refine_diff_density_max         0.23
_refine_diff_density_min         -0.23
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.146
_refine_ls_hydrogen_treatment    noref
_refine_ls_number_parameters     559
_refine_ls_number_reflns         9350
_refine_ls_R_factor_gt           0.0437
_refine_ls_shift/su_max          0.0091
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w = 1/[\s^2^(Fo^2^) + (0.05000(Max(Fo^2^,0) + 2Fc^2^)/3)^2^]'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_ref         0.1093
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_reflns_threshold_expression     F^2^>2.0\s(F^2^)
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_cod_data_source_block           '_030703B'
_cod_original_cell_volume        4367.7(6)
_cod_original_formula_sum        'C58 H48 O4 '
_cod_database_code               7150216