Crystal structure of N,N'-bis(3,5-dihydroxybenzamide)-1,4-benzene, C20H20N2O8
Chen Xu; Ying-Fei Li; Hong-Mei Li; Zhi-Qiang Wang; Yu-Qing Zhang; Zeitschrift für Kristallographie - New Crystal Structures 225 (2010) 513–; doi:

data_8102758
_publ_section_title
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 Crystal structure of N,N'-bis(3,5-dihydroxybenzamide)-1,4-benzene,
 C20H20N2O8
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_journal_issue                   3
_journal_name_full
'Zeitschrift f\"ur Kristallographie - New Crystal Structures'
_journal_page_first              513
_journal_volume                  225
_journal_year                    2010
_chemical_formula_sum            'C20 H20 N2 O8'
_chemical_formula_weight         416.38
_chemical_name_systematic
;
<i>N</i>,<i>N^'^</i>-Bis(3,5-dihydroxybenzamide)-1,4-benzene, C~20~H~20~N~2~O~8~
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_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                 98.067(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   5.6352(16)
_cell_length_b                   10.200(3)
_cell_length_c                   16.093(5)
_cell_measurement_reflns_used    914
_cell_measurement_temperature    291(2)
_cell_measurement_theta_max      22.43
_cell_measurement_theta_min      2.37
_cell_volume                     915.9(5)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      291(2)
_diffrn_measured_fraction_theta_full 0.989
_diffrn_measured_fraction_theta_max 0.989
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega 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  0.0423
_diffrn_reflns_av_sigmaI/netI    0.0439
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            5524
_diffrn_reflns_theta_full        25.49
_diffrn_reflns_theta_max         25.49
_diffrn_reflns_theta_min         2.56
_exptl_absorpt_coefficient_mu    0.118
_exptl_absorpt_correction_T_max  0.9894
_exptl_absorpt_correction_T_min  0.9478
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.510
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             436
_exptl_crystal_size_max          0.46
_exptl_crystal_size_mid          0.26
_exptl_crystal_size_min          0.09
_refine_diff_density_max         0.221
_refine_diff_density_min         -0.201
_refine_diff_density_rms         0.047
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.032
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     138
_refine_ls_number_reflns         1689
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.032
_refine_ls_R_factor_all          0.0710
_refine_ls_R_factor_gt           0.0453
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0596P)^2^+0.2527P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1120
_refine_ls_wR_factor_ref         0.1296
_reflns_number_gt                1163
_reflns_number_total             1689
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            1267-3053.cff
_cod_data_source_block           b
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1555 2011-01-17 13:19:09Z saulius 
;
_cod_original_sg_symbol_H-M      P2(1)/n
_cod_database_code               8102758