<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_2014253
_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 Cl O'
_chemical_formula_sum            'C8 H7 Cl O'
_chemical_formula_weight         154.59
_chemical_name_systematic
;
  4-chloroacetophenone
;
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   4.0079(10)
_cell_length_b                   9.366(2)
_cell_length_c                   19.787(5)
_cell_measurement_reflns_used    1949
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      25.6
_cell_measurement_theta_min      2.4
_cell_volume                     742.8(3)
_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 0.993
_diffrn_measured_fraction_theta_max 0.993
_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  0.039
_diffrn_reflns_av_sigmaI/netI    0.043
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            6382
_diffrn_reflns_theta_full        27.54
_diffrn_reflns_theta_max         27.54
_diffrn_reflns_theta_min         2.06
_diffrn_standards_decay_%        'less than 1'
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.435
_exptl_absorpt_correction_T_max  0.88
_exptl_absorpt_correction_T_min  0.81
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
  SADABS; Sheldrick, 1996; Blessing, 1995
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.382
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'irregular prism'
_exptl_crystal_F_000             320
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.30
_refine_diff_density_max         0.17
_refine_diff_density_min         -0.14
_refine_ls_abs_structure_details 'Flack (1983)'
_refine_ls_abs_structure_Flack   0.11(8)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.033
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     91
_refine_ls_number_reflns         1674
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.033
_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^)+(0.037P)^2^+0.061P] where
P=(Fo^2^+2Fc^2^)/3
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.076
_refine_ls_wR_factor_ref         0.080
_reflns_number_gt                1434
_reflns_number_total             1674
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            sq1158.cif
_cod_data_source_block           ClM
_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_database_code               2014253
_cod_database_fobs_code          2014253