The crystal packing of 4,7-dichloro- and 4,7-dibromobenzo[<i>c</i>]furazan 1-oxide
Britton, Doyle; Mallory, Frank B.; Mallory, Clelia W.; Acta Crystallographica Section C 58 (2002) o235–o238; doi:10.1107/S0108270102003591

data_2012612
_publ_section_title
;
 The crystal packing of 4,7-dichloro- and
 4,7-dibromobenzo[<i>c</i>]furazan 1-oxide
;
_journal_issue                   4
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o235
_journal_page_last               o238
_journal_paper_doi               10.1107/S0108270102003591
_journal_volume                  58
_journal_year                    2002
_chemical_formula_moiety         'C6 H2 Cl2 N2 O2'
_chemical_formula_sum            'C6 H2 Cl2 N2 O2'
_chemical_formula_weight         205.00
_chemical_name_systematic
;
4,7-dichlorobenzo[c]furazan 1-oxide, polymorph II
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           'SHELXTL plus manual additions'
_cell_angle_alpha                90
_cell_angle_beta                 105.21(3)
_cell_angle_gamma                90
_cell_formula_units_Z            24
_cell_length_a                   21.828(5)
_cell_length_b                   7.819(2)
_cell_length_c                   27.501(7)
_cell_measurement_reflns_used    1162
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.4
_cell_measurement_theta_min      2.0
_cell_volume                     4529(2)
_computing_cell_refinement       'SAINT (Siemens, 1995)'
_computing_data_collection       'SMART (Siemens, 1995)'
_computing_data_reduction        SAINT
_computing_molecular_graphics    SHELXTL
_computing_publication_material  SHELXTL
_computing_structure_refinement  SHELXTL
_computing_structure_solution    'SHELXTL (Sheldrick, 1995)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.992
_diffrn_measured_fraction_theta_max 0.992
_diffrn_measurement_device_type  'Siemens SMART CCD area-detector'
_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  0.020
_diffrn_reflns_av_sigmaI/netI    0.019
_diffrn_reflns_limit_h_max       24
_diffrn_reflns_limit_h_min       -28
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       35
_diffrn_reflns_limit_l_min       -33
_diffrn_reflns_number            13985
_diffrn_reflns_theta_full        27.49
_diffrn_reflns_theta_max         27.49
_diffrn_reflns_theta_min         1.53
_diffrn_standards_decay_%        <1
_diffrn_standards_interval_time  360
_diffrn_standards_number         227
_exptl_absorpt_coefficient_mu    0.811
_exptl_absorpt_correction_T_max  0.85
_exptl_absorpt_correction_T_min  0.72
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'[SADABS; Sheldrick (1996) and Blessing (1995)]'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.804
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             2448
_exptl_crystal_size_max          0.45
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.42
_refine_diff_density_min         -0.29
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.06
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     325
_refine_ls_number_reflns         5149
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.06
_refine_ls_R_factor_all          0.045
_refine_ls_R_factor_gt           0.034
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w = 1/[\s^2^(Fo^2^)+(0.035P)^2^+4.8P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.077
_refine_ls_wR_factor_ref         0.081
_reflns_number_gt                4301
_reflns_number_total             5149
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            bk1639.cif
_cod_data_source_block           DCL-II
_cod_depositor_comments
;
The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not measured' was changed to '?'
- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_original_sg_symbol_H-M      'C 2/c'
_cod_database_code               2012612