2,3-Bis(5-bromo-2-thienyl)-6,7-dichloroquinoxaline
Stacy, Vanessa; Crundwell, Guy; Updegraff III, James B.; Zeller, Matthias; Hunter, Allen D.; Acta Crystallographica Section E 61 (2005) o904–o905; doi:10.1107/S1600536805006793

data_2205543
_publ_section_title
;
 2,3-Bis(5-bromo-2-thienyl)-6,7-dichloroquinoxaline
;
_journal_issue                   4
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o904
_journal_page_last               o905
_journal_paper_doi               10.1107/S1600536805006793
_journal_volume                  61
_journal_year                    2005
_chemical_formula_iupac          'C16 H6 Br2 Cl2 N2 S2'
_chemical_formula_moiety         'C16 H6 Br2 Cl2 N2 S2'
_chemical_formula_sum            'C16 H6 Br2 Cl2 N2 S2'
_chemical_formula_weight         521.07
_chemical_melting_point          448
_chemical_name_systematic
;
2,3-Bis(5-bromothien-2-yl)-6,7-dichloroquinoxaline
;
_space_group_IT_number           114
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  'P -4 2n'
_symmetry_space_group_name_H-M   'P -4 21 c'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   20.2456(6)
_cell_length_b                   20.2456(6)
_cell_length_c                   8.5209(5)
_cell_measurement_reflns_used    6538
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      30.309
_cell_measurement_theta_min      2.5935
_cell_volume                     3492.6(3)
_computing_cell_refinement       'SAINT-Plus (Bruker, 1999)'
_computing_data_collection       'SMART (Bruker, 1999)'
_computing_data_reduction        SAINT-Plus
_computing_molecular_graphics    'ORTEP-3 (Farrugia, 1997)'
_computing_publication_material  SHELXL97
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Bruker SMART APEX'
_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  0.0639
_diffrn_reflns_av_sigmaI/netI    0.0401
_diffrn_reflns_limit_h_max       28
_diffrn_reflns_limit_h_min       -28
_diffrn_reflns_limit_k_max       28
_diffrn_reflns_limit_k_min       -28
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            41333
_diffrn_reflns_theta_full        30.56
_diffrn_reflns_theta_max         30.56
_diffrn_reflns_theta_min         1.42
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    5.187
_exptl_absorpt_correction_T_max  0.77
_exptl_absorpt_correction_T_min  0.666636
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Sheldrick, 2003)'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.982
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             2016
_exptl_crystal_size_max          0.188
_exptl_crystal_size_mid          0.05
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.651
_refine_diff_density_min         -0.325
_refine_ls_abs_structure_details 'Flack (1983), 2370 Friedel pairs'
_refine_ls_abs_structure_Flack   0.001(6)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.010
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     217
_refine_ls_number_reflns         5351
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.010
_refine_ls_R_factor_all          0.0407
_refine_ls_R_factor_gt           0.0310
_refine_ls_shift/su_max          0.012
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0368P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0644
_refine_ls_wR_factor_ref         0.0674
_reflns_number_gt                4694
_reflns_number_total             5351
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            lh6378.cif
_cod_data_source_block           I
_cod_depositor_comments
;
The following automatic conversions were performed:
'_geom_bond_publ_flag' value 'NO' changed to 'no' according to
'/home/saulius/struct/CIF-dictionaries/cif_core.dic' dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29 (33
times).

'_geom_angle_publ_flag' value 'NO' changed to 'no' according to
'/home/saulius/struct/CIF-dictionaries/cif_core.dic' dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29 (52
times).

'_geom_torsion_publ_flag' value 'NO' changed to 'no' according to
'/home/saulius/struct/CIF-dictionaries/cif_core.dic' dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29 (54 times).

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 

The following automatic conversions were performed:

'_geom_bond_publ_flag' value 'NO' changed to 'no' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29 (33
times).

'_geom_angle_publ_flag' value 'NO' changed to 'no' according
to /home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary
named 'cif_core.dic' version 2.4.1 from 2010-06-29 (52
times).

'_geom_torsion_publ_flag' value 'NO' changed to 'no'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29 (54
times).

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      'P -4 21 c '
_cod_database_code               2205543
_cod_database_fobs_code          2205543