9,10-Dicyanodibenzoisobullvalene
Jones, Peter G.; Hopf, Henning; Witulkski, Bernhard; Acta Crystallographica Section E 59 (2003) o169–o170; doi:10.1107/S1600536803000941

data_2201788
_publ_section_title
;
 9,10-Dicyanodibenzoisobullvalene
;
_journal_issue                   2
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o169
_journal_page_last               o170
_journal_paper_doi               10.1107/S1600536803000941
_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
;
 9,10-Dicyano-dibenzoisobullvalene
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                96.85(3)
_cell_angle_beta                 90.65(3)
_cell_angle_gamma                102.51(3)
_cell_formula_units_Z            2
_cell_length_a                   6.722(3)
_cell_length_b                   9.154(3)
_cell_length_c                   12.143(4)
_cell_measurement_reflns_used    50
_cell_measurement_temperature    178(2)
_cell_measurement_theta_max      12
_cell_measurement_theta_min      10
_cell_volume                     723.7(5)
_computing_cell_refinement       P3
_computing_data_collection       'P3 (Nicolet, 1987)'
_computing_data_reduction        'XDISK (Nicolet, 1987)'
_computing_molecular_graphics    'XP (Siemens, 1994)'
_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  0.0157
_diffrn_reflns_av_sigmaI/netI    0.0295
_diffrn_reflns_limit_h_max       2
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            3368
_diffrn_reflns_theta_full        24.99
_diffrn_reflns_theta_max         24.99
_diffrn_reflns_theta_min         3.02
_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    1.286
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             292
_exptl_crystal_size_max          0.7
_exptl_crystal_size_mid          0.4
_exptl_crystal_size_min          0.2
_refine_diff_density_max         0.142
_refine_diff_density_min         -0.192
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.030
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     199
_refine_ls_number_reflns         2539
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.030
_refine_ls_R_factor_all          0.0574
_refine_ls_R_factor_gt           0.0402
_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^)+(0.0631P)^2^+0.0943P] where P = (Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1002
_refine_ls_wR_factor_ref         0.1112
_reflns_number_gt                1923
_reflns_number_total             2539
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            bt6226.cif
_cod_data_source_block           2
_cod_database_code               2201788
_cod_database_fobs_code          2201788