Polymorphism of urea–barbituric acid co-crystals
Gryl, Marlena; Krawczuk, Anna; Stadnicka, Katarzyna; Acta Crystallographica Section B 64 (2008) 623–632; doi:10.1107/S0108768108026645

data_2104207
_publ_section_title
;
 Polymorphism of urea--barbituric acid co-crystals
;
_journal_coeditor_code           BS5065
_journal_issue                   5
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              623
_journal_page_last               632
_journal_paper_doi               10.1107/S0108768108026645
_journal_volume                  64
_journal_year                    2008
_chemical_formula_iupac          'C5 H8 N4 O4'
_chemical_formula_moiety         'C4 H4 N2 O3, C H4 N2 O'
_chemical_formula_sum            'C5 H8 N4 O4'
_chemical_formula_weight         188.15
_chemical_name_common            'barbituric acid urea addition compound'
_chemical_name_systematic
;
 2,4,6(1H,3H,5H)-Pyrimidinetrione urea addition compound
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 98.0270(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.8857(3)
_cell_length_b                   6.9620(2)
_cell_length_c                   14.4283(6)
_cell_measurement_reflns_used    1657
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      27.485
_cell_measurement_theta_min      0.998
_cell_volume                     784.36(5)
_computing_cell_refinement       'DENZO-SMN (Otwinowski & Minor, 1997)'
_computing_data_collection       'KappaCCD Server Software (Nonius, 1997)'
_computing_data_reduction
'HKL DENZO and Scalepack (Otwinowski & Minor, 1997)'
_computing_molecular_graphics
;
  PLATON (Spek, 2003); ORTEP-3 for Windows (Farrugia, 1997); MERCURY (Version
  1.4; Macrae et al., 2006)
;
_computing_publication_material  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR92 (Altomare et al., 1994)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 9
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device       '95mm CCD camera on \k-goniostat'
_diffrn_measurement_device_type  KappaCCD
_diffrn_measurement_method       ' \w scans at \c = 55 \% '
_diffrn_radiation_monochromator  'horizontally mounted graphite crystal'
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0254
_diffrn_reflns_av_sigmaI/netI    0.0411
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            3177
_diffrn_reflns_theta_full        27.45
_diffrn_reflns_theta_max         27.45
_diffrn_reflns_theta_min         3.26
_exptl_absorpt_coefficient_mu    0.138
_exptl_absorpt_correction_T_max  0.9931
_exptl_absorpt_correction_T_min  0.9597
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'HKL DENZO and Scalepack (Otwinowski & Minor, 1997)'
_exptl_crystal_colour            yellowish
_exptl_crystal_density_diffrn    1.593
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             392
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.22
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.210
_refine_diff_density_min         -0.192
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   1.028
_refine_ls_goodness_of_fit_ref   1.028
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     118
_refine_ls_number_reflns         1775
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.028
_refine_ls_restrained_S_obs      1.028
_refine_ls_R_factor_all          0.0632
_refine_ls_R_factor_gt           0.0429
_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^)+(0.0535P)^2^+0.1825P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1024
_refine_ls_wR_factor_ref         0.1127
_reflns_number_gt                1334
_reflns_number_total             1775
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            bs5065.cif
_cod_data_source_block           I
_cod_original_sg_symbol_Hall     '-P 2ybc '
_cod_original_sg_symbol_H-M      'P 21/c  '
_cod_database_code               2104207