Quinazoline-2,4(1<i>H</i>,3<i>H</i>)-dione
Liu, Ge; Acta Crystallographica Section E 64 (2008) o1677–; doi:10.1107/S1600536808024240

data_2219235
_publ_section_title
;
 Quinazoline-2,4(1<i>H</i>,3<i>H</i>)-dione
;
_journal_coeditor_code           BH2183
_journal_issue                   9
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o1677
_journal_paper_doi               10.1107/S1600536808024240
_journal_volume                  64
_journal_year                    2008
_chemical_formula_iupac          'C8 H6 N2 O2'
_chemical_formula_moiety         'C8 H6 N2 O2'
_chemical_formula_sum            'C8 H6 N2 O2'
_chemical_formula_weight         162.15
_chemical_name_systematic
;
Quinazoline-2,4(1<i>H</i>,3<i>H</i>)-dione
;
_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                 99.61(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.891(2)
_cell_length_b                   5.2810(11)
_cell_length_c                   12.701(3)
_cell_measurement_reflns_used    5473
_cell_measurement_temperature    293.0(10)
_cell_measurement_theta_max      27.5
_cell_measurement_theta_min      3.3
_cell_volume                     720.3(3)
_computing_cell_refinement       'RAPID-AUTO (Rigaku, 1998)'
_computing_data_collection       'RAPID-AUTO (Rigaku, 1998)'
_computing_data_reduction        'CrystalStructure (Rigaku/MSC, 2002)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 2008)'
_computing_publication_material  'SHELXTL (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      293.0(10)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'Rigaku R-AXIS RAPID-S'
_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  0.0506
_diffrn_reflns_av_sigmaI/netI    0.0387
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       -6
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            5683
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         3.25
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.111
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.495
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             336
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.124
_refine_diff_density_min         -0.120
_refine_ls_extinction_coef       0.009(3)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL97 (Sheldrick, 2008)'
_refine_ls_goodness_of_fit_ref   1.065
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_constraints    0
_refine_ls_number_parameters     110
_refine_ls_number_reflns         1262
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.065
_refine_ls_R_factor_all          0.0923
_refine_ls_R_factor_gt           0.0548
_refine_ls_shift/su_max          0.004
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0327P)^2^+0.2501P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0918
_refine_ls_wR_factor_ref         0.1032
_reflns_number_gt                869
_reflns_number_total             1262
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            bh2183.cif
_cod_data_source_block           I
_cod_original_cell_volume        720.2(3)
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2219235
_cod_database_fobs_code          2219235