Synthesis and Characterization of Dibenzo[a,f]pentalene: Harmonization of the Antiaromatic and Singlet Biradical Character.
Konishi, Akihito; Okada, Yui; Nakano, Motohiro; Sugisaki, Kenji; Sato, Kazunobu; Takui, Takeji; Yasuda, Makoto; Journal of the American Chemical Society 139 (2017) 15284–15287; doi:10.1021/jacs.7b05709

data_4131478
_publ_section_title
;
 Synthesis and Characterization of Dibenzo[a,f]pentalene: Harmonization of
 the Antiaromatic and Singlet Biradical Character.
;
_journal_issue                   43
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              15284
_journal_page_last               15287
_journal_paper_doi               10.1021/jacs.7b05709
_journal_volume                  139
_journal_year                    2017
_chemical_formula_moiety         'C72.5 H69 Cl'
_chemical_formula_sum            'C72.5 H69 Cl'
_chemical_formula_weight         975.80
_space_group_crystal_system      triclinic
_space_group_IT_number           2
_space_group_name_Hall           '-P 1'
_space_group_name_H-M_alt        'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                77.4803(7)
_cell_angle_beta                 89.0213(7)
_cell_angle_gamma                79.9661(7)
_cell_formula_units_Z            2
_cell_length_a                   8.05357(15)
_cell_length_b                   16.8194(3)
_cell_length_c                   21.1151(4)
_cell_measurement_reflns_used    41662
_cell_measurement_temperature    123
_cell_measurement_theta_max      68.23
_cell_measurement_theta_min      3.09
_cell_volume                     2748.82(9)
_computing_cell_refinement       'RAPID AUTO'
_computing_data_collection       'RAPID AUTO (Rigaku, ????)'
_computing_data_reduction        'RAPID AUTO'
_computing_molecular_graphics    'CrystalStructure 4.2'
_computing_publication_material  'CrystalStructure 4.2 (Rigaku, 2015)'
_computing_structure_refinement  'SHELXL Version 2014/7 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXT Version 2014/5 (Sheldrick, 2014)'
_diffrn_ambient_temperature      123
_diffrn_detector_area_resol_mean 10.000
_diffrn_measured_fraction_theta_full 0.986
_diffrn_measured_fraction_theta_max 0.985
_diffrn_measurement_device_type  'Rigaku R-AXIS RAPID'
_diffrn_measurement_method       \w
_diffrn_radiation_type           'Cu K\a'
_diffrn_radiation_wavelength     1.54187
_diffrn_reflns_av_R_equivalents  0.0342
_diffrn_reflns_Laue_measured_fraction_full 0.986
_diffrn_reflns_Laue_measured_fraction_max 0.985
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -20
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            51741
_diffrn_reflns_point_group_measured_fraction_full 0.986
_diffrn_reflns_point_group_measured_fraction_max 0.985
_diffrn_reflns_theta_full        67.687
_diffrn_reflns_theta_max         68.236
_diffrn_reflns_theta_min         3.086
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.932
_exptl_absorpt_correction_T_max  0.830
_exptl_absorpt_correction_T_min  0.782
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'ABSCOR (Rigaku, 1995)'
_exptl_crystal_colour            brown
_exptl_crystal_density_diffrn    1.179
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       platelet
_exptl_crystal_F_000             1042.00
_exptl_crystal_size_max          0.200
_exptl_crystal_size_mid          0.200
_exptl_crystal_size_min          0.200
_refine_diff_density_max         0.27
_refine_diff_density_min         -0.71
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.132
_refine_ls_hydrogen_treatment    constr
_refine_ls_number_parameters     692
_refine_ls_number_reflns         9912
_refine_ls_number_restraints     3
_refine_ls_R_factor_all          0.0674
_refine_ls_R_factor_gt           0.0506
_refine_ls_shift/su_max          0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w = 1/[\s^2^(Fo^2^)+(0.0745P)^2^+0.9682P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1391
_refine_ls_wR_factor_ref         0.1567
_reflns_Friedel_coverage         0.000
_reflns_number_gt                7577
_reflns_number_total             9912
_reflns_threshold_expression     F^2^>2.0\s(F^2^)
_cod_data_source_file            ja7b05709_si_004.cif
_cod_data_source_block           YO160314
_cod_database_code               4131478
_shelx_res_checksum              11165
_shelx_hkl_checksum              47024