<i>p</i>-Chloro-, <i>p</i>-bromo- and two polymorphs of <i>p</i>-iodoacetophenone
Britton, Doyle; Brennessel, William W.; Acta Crystallographica Section C 60 (2004) o552–o556; doi:10.1107/S0108270104013824

data_2014255
_publ_section_title
;
 <i>p</i>-Chloro-, <i>p</i>-bromo- and two polymorphs of
 <i>p</i>-iodoacetophenone
;
_journal_issue                   8
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o552
_journal_page_last               o556
_journal_paper_doi               10.1107/S0108270104013824
_journal_volume                  60
_journal_year                    2004
_chemical_formula_moiety         'C8 H7 I O'
_chemical_formula_sum            'C8 H7 I O'
_chemical_formula_weight         246.04
_chemical_melting_point          358.5(5)
_chemical_name_systematic
;
  p-iodoacetophenone polymorph A
;
_space_group_IT_number           9
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'C -2yc'
_symmetry_space_group_name_H-M   'C 1 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                90.00
_cell_angle_beta                 94.410(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   19.425(5)
_cell_length_b                   7.049(2)
_cell_length_c                   5.8769(15)
_cell_measurement_reflns_used    3302
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.5
_cell_measurement_theta_min      3.1
_cell_volume                     802.3(4)
_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, 1997)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type
;
Siemens SMART 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  0.031
_diffrn_reflns_av_sigmaI/netI    0.037
_diffrn_reflns_limit_h_max       25
_diffrn_reflns_limit_h_min       -25
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       7
_diffrn_reflns_limit_l_min       -7
_diffrn_reflns_number            4483
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         27.50
_diffrn_reflns_theta_min         2.10
_diffrn_standards_decay_%        ' less than 1 '
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    3.918
_exptl_absorpt_correction_T_max  0.68
_exptl_absorpt_correction_T_min  0.38
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
(SADABS; Sheldrick, 1996; Blessing, 1995)
;
_exptl_crystal_colour            'pale yellow'
_exptl_crystal_density_diffrn    2.037
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             464
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.63
_refine_diff_density_min         -0.31
_refine_ls_abs_structure_details 'Flack (1983)'
_refine_ls_abs_structure_Flack   -0.01(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.05
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     91
_refine_ls_number_reflns         1821
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.05
_refine_ls_R_factor_all          0.024
_refine_ls_R_factor_gt           0.023
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
;
calc w=1/[\s^2^(Fo^2^)+(0.032P)^2^+0.031P] where
P=(Fo^2^+2Fc^2^)/3
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.059
_refine_ls_wR_factor_ref         0.060
_reflns_number_gt                1768
_reflns_number_total             1821
_reflns_threshold_expression     'I>2\s(I) '
_cod_data_source_file            sq1158.cif
_cod_data_source_block           IM-A
_cod_depositor_comments
;
The following automatic conversions were performed:

'_chemical_melting_point' value '358-359 K' was changed to '358.5(5)'
- the average value was taken and precision was estimated.

Automatic conversion script
Id: cif_fix_values 1646 2011-03-28 12:23:43Z adriana 

The following automatic conversions were performed:

'_chemical_melting_point' value '358-359 K' was changed to '358.5(5)'
- the average value was taken and precision was estimated.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 

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 c'
_cod_database_code               2014255
_cod_database_fobs_code          2014255