Three new pseudopolymorphs of 6-aminouracil
Gerhardt, Valeska; Bolte, Michael; Acta Crystallographica Section C 69 (2013) 1402–1407; doi:10.1107/S0108270113028874

data_2019255
_publ_section_title
;
 Three new pseudopolymorphs of 6-aminouracil
;
_journal_coeditor_code           UK3082
_journal_issue                   11
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              1402
_journal_page_last               1407
_journal_paper_doi               10.1107/S0108270113028874
_journal_volume                  69
_journal_year                    2013
_chemical_formula_iupac          'C4 H5 N3 O2, C4 H9 N O'
_chemical_formula_moiety         'C4 H5 N3 O2, C4 H9 N O'
_chemical_formula_sum            'C8 H14 N4 O3'
_chemical_formula_weight         214.23
_chemical_name_systematic
;
6-Aminouracil dimethylacetamide monosolvate
;
_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'
_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                 92.908(8)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   7.1200(7)
_cell_length_b                   21.882(3)
_cell_length_c                   13.1561(14)
_cell_measurement_reflns_used    6388
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      26.025
_cell_measurement_theta_min      3.315
_cell_volume                     2047.1(4)
_computing_cell_refinement       '<i>X-AREA</i> (Stoe & Cie, 2001)'
_computing_data_collection       '<i>X-AREA</i> (Stoe & Cie, 2001)'
_computing_data_reduction        '<i>X-AREA</i> (Stoe & Cie, 2001)'
_computing_molecular_graphics
;
Mercury (Macrae <i>et al.</i>, 2008) and XP in SHELXTL-Plus (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 0.992
_diffrn_measurement_device_type  'Stoe IPDS II two-circle'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  'Genix 3D multilayer optics'
_diffrn_radiation_source         'Genix 3D I\mS microfocus X-ray source'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0623
_diffrn_reflns_av_sigmaI/netI    0.0762
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       25
_diffrn_reflns_limit_k_min       -26
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            11142
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.62
_diffrn_reflns_theta_min         3.32
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.108
_exptl_absorpt_correction_T_max  0.9787
_exptl_absorpt_correction_T_min  0.9683
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(<i>X-AREA</i>; Stoe & Cie, 2001)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.390
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             912
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.319
_refine_diff_density_min         -0.318
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.984
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     336
_refine_ls_number_reflns         3823
_refine_ls_number_restraints     23
_refine_ls_restrained_S_all      0.997
_refine_ls_R_factor_all          0.1236
_refine_ls_R_factor_gt           0.0624
_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^)+(0.0850P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1457
_refine_ls_wR_factor_ref         0.1685
_reflns_number_gt                2098
_reflns_number_total             3823
_reflns_threshold_expression     I>2sigma(I)
_cod_data_source_file            uk3082.cif
_cod_data_source_block           Ib
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2019255