Does the size of a crystal matter in an X-ray crystal structure analysis of a small molecule?
Tan, Seng Lim; Ng, Seik Weng; Journal of Applied Crystallography 47 (2014) 1443–1444; doi:10.1107/S1600576714011297

data_2300468
_publ_section_title
;
 Does the size of a crystal matter in an X-ray crystal structure analysis
 of a small molecule?
;
_journal_coeditor_code           kk5175
_journal_issue                   4
_journal_name_full               'Journal of Applied Crystallography'
_journal_page_first              1443
_journal_page_last               1444
_journal_paper_doi               10.1107/S1600576714011297
_journal_volume                  47
_journal_year                    2014
_chemical_formula_moiety         'C20 H15 Br'
_chemical_formula_sum            'C20 H15 Br'
_chemical_formula_weight         335.23
_chemical_name_systematic
; 
 (2-Bromo-1,2-diphenylethenyl)benzene
;
_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           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   5.6011(3)
_cell_length_b                   8.5219(4)
_cell_length_c                   31.4741(13)
_cell_measurement_reflns_used    4168
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      27.5180
_cell_measurement_theta_min      3.5160
_cell_volume                     1502.32(12)
_computing_cell_refinement       'CrysAlis PRO (Agilent, 2014)'
_computing_data_collection       'CrysAlis PRO (Agilent, 2014)'
_computing_data_reduction        'CrysAlis PRO (Agilent, 2014)'
_computing_molecular_graphics    'X-Seed (Barbour, 2001)'
_computing_publication_material  'publCIF (Westrip, 2010)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 10.4041
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type
'Agilent Technologies SuperNova Dual diffractometer with Atlas detector'
_diffrn_measurement_method       '\w scan'
_diffrn_radiation_monochromator  Mirror
_diffrn_radiation_source         'SuperNova (Mo) X-ray Source'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0339
_diffrn_reflns_av_sigmaI/netI    0.0418
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       40
_diffrn_reflns_limit_l_min       -38
_diffrn_reflns_number            10235
_diffrn_reflns_theta_full        27.59
_diffrn_reflns_theta_max         27.59
_diffrn_reflns_theta_min         3.08
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    2.726
_exptl_absorpt_correction_T_max  0.619
_exptl_absorpt_correction_T_min  0.392
_exptl_absorpt_correction_type   gaussian
_exptl_absorpt_process_details   'CrysAlis PRO (Agilent, 2014)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.482
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             680
_exptl_crystal_size_max          0.51
_exptl_crystal_size_mid          0.39
_exptl_crystal_size_min          0.23
_refine_diff_density_max         0.957
_refine_diff_density_min         -0.673
_refine_diff_density_rms         0.071
_refine_ls_abs_structure_details 'Flack parameter from 1425 Friedel pairs'
_refine_ls_abs_structure_Flack   0.009(11)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.022
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     190
_refine_ls_number_reflns         3479
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.022
_refine_ls_R_factor_all          0.0407
_refine_ls_R_factor_gt           0.0348
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0336P)^2^+0.9819P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0734
_refine_ls_wR_factor_ref         0.0758
_reflns_number_gt                3169
_reflns_number_total             3479
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            kk5175sup1.cif
_cod_data_source_block           Br2
_cod_depositor_comments
;
The following automatic conversions were performed:

'_exptl_absorpt_correction_type' value 'Gaussian' changed to
'gaussian' according to
/usr/data/users/saulius/crontab/automatic-downloads/rss-feeds/IUCr/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2281 2013-09-26 08:29:07Z andrius 

 Adding full bibliography for 2300463--2300482.cif.
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_cod_database_code               2300468
_cod_database_fobs_code          2300468