An exotic band structure of a supramolecular honeycomb lattice formed by a pancake π-π interaction between triradical trianions of triptycene tribenzoquinone.
Shuku, Yoshiaki; Mizuno, Asato; Ushiroguchi, Ryo; Hyun, Chang Seok; Ryu, Young Jun; An, Byeong-Kwan; Kwon, Ji Eon; Park, Soo Young; Tsuchiizu, Masahisa; Awaga, Kunio; Chemical communications (Cambridge, England) 54 (2018) 3815–3818; doi:10.1039/c8cc00753e

data_7121292
_publ_section_title
;
 An exotic band structure of a supramolecular honeycomb lattice formed by
 a pancake \p-\p interaction between triradical trianions of triptycene
 tribenzoquinone.
;
_journal_issue                   31
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              3815
_journal_page_last               3818
_journal_paper_doi               10.1039/c8cc00753e
_journal_volume                  54
_journal_year                    2018
_chemical_formula_moiety         'C20 H8 O6'
_chemical_formula_sum            'C20 H8 O6'
_chemical_formula_weight         344.28
_space_group_crystal_system      tetragonal
_space_group_IT_number           109
_space_group_name_Hall           'I 4bw -2'
_space_group_name_H-M_alt        'I 41 m d'
_symmetry_space_group_name_Hall  'I 4bw -2'
_symmetry_space_group_name_H-M   'I 41 m d'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_update_record
;
2018-01-13 deposited with the CCDC.
2018-02-12 downloaded from the CCDC.
;
_cell_angle_alpha                90.0000
_cell_angle_beta                 90.0000
_cell_angle_gamma                90.0000
_cell_formula_units_Z            4
_cell_length_a                   10.781(3)
_cell_length_b                   10.781(3)
_cell_length_c                   12.687(3)
_cell_measurement_reflns_used    2465
_cell_measurement_temperature    123
_cell_measurement_theta_max      27.44
_cell_measurement_theta_min      3.78
_cell_volume                     1474.6(7)
_computing_cell_refinement       CrystalClear
_computing_data_collection       'CrystalClear (Rigaku/MSC Inc., 2006)'
_computing_data_reduction        CrystalClear
_computing_molecular_graphics    'CrystalStructure 4.2.5'
_computing_publication_material  'CrystalStructure 4.2.5 (Rigaku, 2017)'
_computing_structure_refinement  'SHELXL Version 2016/4 (Sheldrick, 2008)'
_computing_structure_solution    SIR97
_diffrn_ambient_temperature      123
_diffrn_detector_area_resol_mean 7.314
_diffrn_measured_fraction_theta_full 0.987
_diffrn_measured_fraction_theta_max 0.990
_diffrn_measurement_device_type  'Rigaku Saturn70'
_diffrn_measurement_method       \w
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71075
_diffrn_reflns_av_R_equivalents  0.0312
_diffrn_reflns_Laue_measured_fraction_full 0.987
_diffrn_reflns_Laue_measured_fraction_max 0.990
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            5556
_diffrn_reflns_point_group_measured_fraction_full 0.961
_diffrn_reflns_point_group_measured_fraction_max 0.958
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.444
_diffrn_reflns_theta_min         3.780
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.116
_exptl_absorpt_correction_T_max  0.992
_exptl_absorpt_correction_T_min  0.883
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'REQAB (Rigaku, 1998)'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.551
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             704.00
_exptl_crystal_size_max          0.090
_exptl_crystal_size_mid          0.080
_exptl_crystal_size_min          0.070
_refine_diff_density_max         0.26
_refine_diff_density_min         -0.18
_refine_ls_abs_structure_details
;
 Flack x determined using 359 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   -0.2(5)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.134
_refine_ls_hydrogen_treatment    constr
_refine_ls_number_parameters     67
_refine_ls_number_reflns         899
_refine_ls_number_restraints     1
_refine_ls_R_factor_all          0.0293
_refine_ls_R_factor_gt           0.0275
_refine_ls_shift/su_max          0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w = 1/[\s^2^(Fo^2^)+(0.0447P)^2^+0.2452P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0727
_refine_ls_wR_factor_ref         0.0735
_reflns_Friedel_coverage         0.857
_reflns_Friedel_fraction_full    0.931
_reflns_Friedel_fraction_max     0.924
_reflns_number_gt                853
_reflns_number_total             899
_reflns_threshold_expression     F^2^>2.0\s(F^2^)
_cod_data_source_file            c8cc00753e2.cif
_cod_data_source_block           TT
_cod_depositor_comments
'Adding full bibliography for 7121292--7121294.cif.'
_cod_original_cell_volume        1474.6(6)
_cod_database_code               7121292
_shelx_res_checksum              5969
_shelx_hkl_checksum              79682