2,3:9,10-Dibenzotricyclo[5.3.0.0^4,8^]deca-2,5,9-triene-6,7-dicarbonitrile
Jones, Peter G.; Bubenitschek, Peter; Hopf, Henning; Witulski, Bernhard; Acta Crystallographica Section E 59 (2003) o220–o221; doi:10.1107/S160053680300134X

data_2201793
_publ_section_title
;
 2,3:9,10-Dibenzotricyclo[5.3.0.0^4,8^]deca-2,5,9-triene-6,7-dicarbonitrile
;
_journal_issue                   2
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o220
_journal_page_last               o221
_journal_paper_doi               10.1107/S160053680300134X
_journal_volume                  59
_journal_year                    2003
_chemical_formula_iupac          'C20 H12 N2'
_chemical_formula_moiety         'C20 H12 N2'
_chemical_formula_sum            'C20 H12 N2'
_chemical_formula_weight         280.32
_chemical_name_systematic
;
2,3:9,10-Dibenzotricyclo[5.3.0.0^4,8^]deca-2,5,9-triene-6,7-dicarbonitrile
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_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                 99.11(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   15.834(5)
_cell_length_b                   8.196(3)
_cell_length_c                   22.849(7)
_cell_measurement_reflns_used    50
_cell_measurement_temperature    178(2)
_cell_measurement_theta_max      11.5
_cell_measurement_theta_min      10
_cell_volume                     2927.8(17)
_computing_cell_refinement       P3
_computing_data_collection       'P3 (Nicolet, 1987)'
_computing_data_reduction        'XDISK (Nicolet, 1987)'
_computing_molecular_graphics    'XP (Siemens, 1996)'
_computing_publication_material  SHELXL97
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      178(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Nicolet R3'
_diffrn_measurement_method       \w
_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  0.0258
_diffrn_reflns_av_sigmaI/netI    0.0280
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       -18
_diffrn_reflns_limit_k_max       1
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       0
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            2674
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.05
_diffrn_reflns_theta_min         3.01
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 147
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.076
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.272
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             1168
_exptl_crystal_size_max          0.7
_exptl_crystal_size_mid          0.4
_exptl_crystal_size_min          0.4
_refine_diff_density_max         0.178
_refine_diff_density_min         -0.172
_refine_ls_extinction_coef       0.0026(4)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL97
_refine_ls_goodness_of_fit_ref   1.046
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     200
_refine_ls_number_reflns         2596
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.046
_refine_ls_R_factor_all          0.0577
_refine_ls_R_factor_gt           0.0381
_refine_ls_shift/su_max          <0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w = 1/[\s^2^(Fo^2^)+(0.0374P)^2^+2.4161P] where P = (Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0862
_refine_ls_wR_factor_ref         0.0993
_reflns_number_gt                1938
_reflns_number_total             2596
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            bt6231.cif
_cod_data_source_block           I
_cod_original_sg_symbol_H-M      'C 2/c'
_cod_database_code               2201793
_cod_database_fobs_code          2201793