Two novel polymorphic forms of iron-chelating agent deferiprone
Rajendrakumar, Satyasree; Durga, Anuja Surampudi Venkata Sai; Nanubolu, Jagadeesh Babu; Balasubramanian, Sridhar; Acta Crystallographica Section C 76 (2020) 193–200; doi:10.1107/S2053229620000959

data_2021970
_publ_section_title
;
 Two novel polymorphic forms of iron-chelating agent deferiprone
;
_journal_coeditor_code           CU3158
_journal_issue                   2
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              193
_journal_page_last               200
_journal_paper_doi               10.1107/S2053229620000959
_journal_volume                  76
_journal_year                    2020
_chemical_formula_iupac          'C7 H9 N O2'
_chemical_formula_moiety         'C7 H9 N O2'
_chemical_formula_sum            'C7 H9 N O2'
_chemical_formula_weight         139.15
_chemical_name_common            Deferiprone
_chemical_name_systematic
;
3-Hydroxy-1,2-dimethylpyridin-4-one
;
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_atom_sites_solution_hydrogens   mixed
_audit_creation_method           SHELXL-2018/3
_cell_angle_alpha                90
_cell_angle_beta                 91.7750(10)
_cell_angle_gamma                90
_cell_formula_units_Z            12
_cell_length_a                   19.4132(8)
_cell_length_b                   13.7057(7)
_cell_length_c                   7.1809(7)
_cell_measurement_reflns_used    9985
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      30.59
_cell_measurement_theta_min      2.98
_cell_volume                     1909.7(2)
_computing_cell_refinement
;
<i>SAINT</i> (Bruker, 2016)
;
_computing_data_collection
;
<i>APEX3</i> (Bruker, 2016)
;
_computing_data_reduction
;
<i>SAINT</i> (Bruker, 2016)
;
_computing_molecular_graphics
;
DIAMOND (Brandenburg & Putz, 2005)
;
_computing_publication_material
;
<i>SHELXTL</i> (Bruker, 2016)
;
_computing_structure_refinement
;
SHELXL2018 (Sheldrick, 2015b)
;
_computing_structure_solution
;
<i>SHELXT</i> (Sheldrick, 2015a)
;
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Bruker D8 QUEST PHOTON-100'
_diffrn_measurement_method       '\w and \f'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0333
_diffrn_reflns_av_unetI/netI     0.0330
_diffrn_reflns_limit_h_max       27
_diffrn_reflns_limit_h_min       -27
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            24981
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         30.553
_diffrn_reflns_theta_min         2.572
_exptl_absorpt_coefficient_mu    0.107
_exptl_absorpt_correction_T_max  0.7461
_exptl_absorpt_correction_T_min  0.6788
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
(SADABS; Bruker, 2016)
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.452
_exptl_crystal_description       needle
_exptl_crystal_F_000             888
_exptl_crystal_size_max          0.260
_exptl_crystal_size_mid          0.130
_exptl_crystal_size_min          0.110
_refine_diff_density_max         0.417
_refine_diff_density_min         -0.289
_refine_ls_extinction_method     none
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_refine_ls_number_reflns         5838
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_refine_ls_restrained_S_all      0.947
_refine_ls_R_factor_all          0.0647
_refine_ls_R_factor_gt           0.0472
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0520P)^2^+1.6010P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1167
_refine_ls_wR_factor_ref         0.1259
_reflns_number_gt                4477
_reflns_number_total             5838
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            cu3158sup1.cif
_cod_data_source_block           Ic
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2021970
_cod_database_fobs_code          2021970
_shelx_estimated_absorpt_t_min   0.973
_shelx_estimated_absorpt_t_max   0.988
_shelx_hkl_checksum              55795
_shelx_res_checksum              94691