Pseudopolymorphs of chelidamic acid and its dimethyl ester
Tutughamiarso, Maya; Pisternick, Thorsten; Egert, Ernst; Acta Crystallographica Section C 68 (2012) o344–o350; doi:10.1107/S0108270112031691

data_2018600
_publ_section_title
;
 Pseudopolymorphs of chelidamic acid and its dimethyl ester
;
_journal_coeditor_code           EG3095
_journal_issue                   9
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o344
_journal_page_last               o350
_journal_paper_doi               10.1107/S0108270112031691
_journal_volume                  68
_journal_year                    2012
_chemical_formula_iupac          'C7 H5 N O5, C H4 O'
_chemical_formula_moiety         'C7 H5 N O5, C H4 O'
_chemical_formula_sum            'C8 H9 N O6'
_chemical_formula_weight         215.16
_chemical_name_common
;
chelidamic acid methanol monosolvate
;
_chemical_name_systematic
;
4-hydroxypyridine-2,6-dicarboxylic acid methanol monosolvate
;
_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                 100.303(7)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   5.8256(5)
_cell_length_b                   12.5648(12)
_cell_length_c                   12.7464(11)
_cell_measurement_reflns_used    12422
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      25.86
_cell_measurement_theta_min      3.24
_cell_volume                     917.96(14)
_computing_cell_refinement       'X-AREA (Stoe & Cie, 2001)'
_computing_data_collection       'X-AREA (Stoe & Cie, 2001)'
_computing_data_reduction        'X-AREA (Stoe & Cie, 2001)'
_computing_molecular_graphics
'Mercury (Macrae <i>et al.</i>, 2008) and XP (Sheldrick, 2008)'
_computing_publication_material  'publCIF (Westrip, 2010)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Stoe IPDS II two-circle'
_diffrn_measurement_method       \w
_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  0.0427
_diffrn_reflns_av_sigmaI/netI    0.0249
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            8713
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.56
_diffrn_reflns_theta_min         3.24
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.136
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.557
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             448
_exptl_crystal_size_max          0.52
_exptl_crystal_size_mid          0.50
_exptl_crystal_size_min          0.44
_refine_diff_density_max         0.180
_refine_diff_density_min         -0.261
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.065
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     153
_refine_ls_number_reflns         1712
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.065
_refine_ls_R_factor_all          0.0424
_refine_ls_R_factor_gt           0.0361
_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^)+(0.0521P)^2^+0.3671P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0921
_refine_ls_wR_factor_ref         0.0958
_reflns_number_gt                1491
_reflns_number_total             1712
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            eg3095.cif
_cod_data_source_block           Ia
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               2018600
_cod_database_fobs_code          2018600