3,5-Dihalo-4-hydroxybenzonitriles: isostructures, polymorphs and solvates
Britton, Doyle; Acta Crystallographica Section B 62 (2006) 109–117; doi:10.1107/S0108768105038267

data_2100369
_publ_section_title
;
 3,5-Dihalo-4-hydroxybenzonitriles: isostructures, polymorphs and
 solvates
;
_journal_coeditor_code           DE5020
_journal_date_accepted           2005-11-19
_journal_date_recd_electronic    2005-04-29
_journal_issue                   1
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              109
_journal_page_last               117
_journal_paper_category          FA
_journal_paper_doi               10.1107/S0108768105038267
_journal_volume                  62
_journal_year                    2006
_chemical_formula_moiety         'C7 H3 Br2 N O'
_chemical_formula_sum            'C7 H3 Br2 N O'
_chemical_formula_weight         276.92
_chemical_name_common            Bromoxynil
_chemical_name_systematic
;
 3,5-dibromo-4-hydroxybenzonitrile - polymorph A
;
_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           SHELXTL
_cell_angle_alpha                95.600(10)
_cell_angle_beta                 108.550(10)
_cell_angle_gamma                106.130(10)
_cell_formula_units_Z            4
_cell_length_a                   8.244(2)
_cell_length_b                   9.120(2)
_cell_length_c                   11.687(3)
_cell_measurement_reflns_used    2861
_cell_measurement_temperature    174(2)
_cell_measurement_theta_max      27.49
_cell_measurement_theta_min      2.38
_cell_volume                     783.4(3)
_computing_cell_refinement       'SAINT (Bruker, 2002)'
_computing_data_collection       'SMART (Bruker, 2002)'
_computing_data_reduction        SAINT
_computing_molecular_graphics    SHELXTL
_computing_publication_material  SHELXTL
_computing_structure_refinement  SHELXTL
_computing_structure_solution    'SHELXTL (Sheldrick, 1997)'
_diffrn_ambient_temperature      174(2)
_diffrn_measured_fraction_theta_full 0.989
_diffrn_measured_fraction_theta_max 0.989
_diffrn_measurement_device_type
;
Siemens area detector diffractometer
;
_diffrn_measurement_method       '\w scans'
_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  0.027
_diffrn_reflns_av_sigmaI/netI    0.032
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            9376
_diffrn_reflns_theta_full        27.52
_diffrn_reflns_theta_max         27.52
_diffrn_reflns_theta_min         1.88
_diffrn_standards_decay_%        'less than 1'
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    10.281
_exptl_absorpt_correction_T_max  0.214
_exptl_absorpt_correction_T_min  0.174
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
 SADABS;  Sheldrick, 1996;  Blessing, 1995'
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    2.348
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    .
_exptl_crystal_description       prism
_exptl_crystal_F_000             520
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.65
_refine_diff_density_min         -0.61
_refine_ls_extinction_coef       0.0029(3)
_refine_ls_extinction_expression
;
 Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
;
_refine_ls_extinction_method     SHELXTL
_refine_ls_goodness_of_fit_ref   1.09
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     200
_refine_ls_number_reflns         3568
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.09
_refine_ls_R_factor_all          0.046
_refine_ls_R_factor_gt           0.035
_refine_ls_shift/su_max          0.006
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
;
 calc w=1/[\s^2^(Fo^2^)+(0.028P)^2^+2.20P] where
P=(Fo^2^+2Fc^2^)/3
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.076
_refine_ls_wR_factor_ref         0.079
_reflns_number_gt                3107
_reflns_number_total             3568
_reflns_threshold_expression     '>2\s(I) '
_cod_data_source_file            de5020.cif
_cod_data_source_block           MBr-A
_cod_database_code               2100369
_cod_database_fobs_code          2100369