2,3-Bis(4-chlorophenyl)quinoxaline
Hong-Bin Zhao; Zhi-Zhi Hu; Xing Chen; Cui-Ping Wang; Zhi-Qiang Zhang; Acta Crystallographica Section E 63 (2007) o2488–o2489; doi:10.1107/S1600536807016972

data_2213089
_publ_section_title
;
 2,3-Bis(4-chlorophenyl)quinoxaline
;
_journal_coeditor_code           AT2259
_journal_issue                   5
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o2488
_journal_page_last               o2489
_journal_paper_doi               10.1107/S1600536807016972
_journal_volume                  63
_journal_year                    2007
_chemical_formula_iupac          'C20 H12 Cl2 N2'
_chemical_formula_moiety         'C20 H12 Cl2 N2'
_chemical_formula_sum            'C20 H12 Cl2 N2'
_chemical_formula_weight         351.22
_chemical_melting_point          447
_chemical_name_systematic
;
2,3-Bis(4-chlorophenyl)quinoxaline
;
_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
_cell_angle_alpha                104.764(7)
_cell_angle_beta                 92.259(7)
_cell_angle_gamma                95.778(7)
_cell_formula_units_Z            2
_cell_length_a                   5.9282(6)
_cell_length_b                   11.9737(12)
_cell_length_c                   12.0247(13)
_cell_measurement_temperature    298(2)
_cell_volume                     819.29(15)
_computing_cell_refinement       SMART
_computing_data_collection       'SMART (Bruker, 1997)'
_computing_data_reduction        'SAINT (Bruker, 1997)'
_computing_molecular_graphics    'SHELXTL (Bruker, 1997)'
_computing_publication_material  SHELXTL
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.969
_diffrn_measured_fraction_theta_max 0.969
_diffrn_measurement_device_type  'Bruker SMART CCD area-detector'
_diffrn_measurement_method       '\f and \w'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0182
_diffrn_reflns_av_sigmaI/netI    0.0290
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            4712
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         3.54
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.399
_exptl_absorpt_correction_T_max  0.9426
_exptl_absorpt_correction_T_min  0.8898
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Sheldrick, 1996)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.424
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             360
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.26
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.223
_refine_diff_density_min         -0.194
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.020
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     217
_refine_ls_number_reflns         2788
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.020
_refine_ls_R_factor_all          0.0492
_refine_ls_R_factor_gt           0.0390
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w = 1/[\s^2^(Fo^2^)+(0.0541P)^2^+0.034P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1306
_refine_ls_wR_factor_ref         0.1389
_reflns_number_gt                2268
_reflns_number_total             2788
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            at2259.cif
_cod_data_source_block           I
_cod_database_code               2213089
_cod_database_fobs_code          2213089