6,8-Dibromo-4-oxo-4<i>H</i>-chromene-3-carbaldehyde
Ishikawa, Yoshinobu; Acta Crystallographica Section E 70 (2014) o439–; doi:10.1107/S1600536814005327

data_2239224
_publ_section_title
;
 6,8-Dibromo-4-oxo-4<i>H</i>-chromene-3-carbaldehyde
;
_journal_issue                   4
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o439
_journal_paper_doi               10.1107/S1600536814005327
_journal_volume                  70
_journal_year                    2014
_chemical_formula_iupac          'C10 H4 Br2 O3'
_chemical_formula_moiety         'C10 H4 Br2 O3'
_chemical_formula_sum            'C10 H4 Br2 O3'
_chemical_formula_weight         331.95
_chemical_name_systematic
;
6,8-Dibromo-4-oxo-4<i>H</i>-chromene-3-carbaldehyde
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.0000
_cell_angle_beta                 95.69(3)
_cell_angle_gamma                90.0000
_cell_formula_units_Z            4
_cell_length_a                   11.910(4)
_cell_length_b                   3.8500(12)
_cell_length_c                   20.817(6)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    100
_cell_measurement_theta_max      17.34
_cell_measurement_theta_min      15.04
_cell_volume                     949.8(5)
_computing_cell_refinement       '<i>WinAFC</i> (Rigaku, 1999)'
_computing_data_collection       '<i>WinAFC</i> (Rigaku, 1999)'
_computing_data_reduction        '<i>WinAFC</i> (Rigaku, 1999)'
_computing_molecular_graphics    'CrystalStructure (Rigaku, 2010)'
_computing_publication_material  'CrystalStructure (Rigaku, 2010)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SIR92 (Altomare <i>et al.</i>, 1994)'
_diffrn_ambient_temperature      100
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Rigaku AFC-7R'
_diffrn_measurement_method       \w
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.0097
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       4
_diffrn_reflns_limit_k_min       -2
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            2871
_diffrn_reflns_theta_full        27.49
_diffrn_reflns_theta_max         27.49
_diffrn_standards_decay_%        -0.074
_diffrn_standards_interval_count 150
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    8.538
_exptl_absorpt_correction_T_max  0.140
_exptl_absorpt_correction_T_min  0.086
_exptl_absorpt_correction_type   psi-scan
_exptl_absorpt_process_details   '(North <i>et al.</i>, 1968)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    2.321
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             632.00
_exptl_crystal_size_max          0.420
_exptl_crystal_size_mid          0.250
_exptl_crystal_size_min          0.230
_refine_diff_density_max         0.370
_refine_diff_density_min         -0.460
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.056
_refine_ls_hydrogen_treatment    constr
_refine_ls_number_parameters     136
_refine_ls_number_reflns         2163
_refine_ls_number_restraints     0
_refine_ls_R_factor_gt           0.0191
_refine_ls_shift/su_max          0.002
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w = 1/[\s^2^(Fo^2^)+(0.0209P)^2^+0.9331P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_ref         0.0446
_reflns_number_gt                1937
_reflns_number_total             2163
_reflns_threshold_expression     F^2^>2\s(F^2^)
_cod_data_source_file            rn2123sup1.cif
_cod_data_source_block           I
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2239224
_cod_database_fobs_code          2239224