A new polymorph and two pseudopolymorphs of pyrimethamine
Tutughamiarso, Maya; Bolte, Michael; Acta Crystallographica Section C 67 (2011) o428–o434; doi:10.1107/S0108270111038868

data_2018300
_publ_section_title
;
 A new polymorph and two pseudopolymorphs of pyrimethamine
;
_journal_coeditor_code           SK3416
_journal_issue                   11
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o428
_journal_page_last               o434
_journal_paper_doi               10.1107/S0108270111038868
_journal_volume                  67
_journal_year                    2011
_chemical_formula_iupac          'C12 H13 Cl N4'
_chemical_formula_moiety         'C12 H13 Cl N4'
_chemical_formula_sum            'C12 H13 Cl N4'
_chemical_formula_weight         248.71
_chemical_name_systematic
;
2,4-diamino-5(4-chlorophenyl)-6-ethylpyrimidine
;
_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           SHELXL97
_cell_angle_alpha                90.00
_cell_angle_beta                 107.279(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   14.4471(18)
_cell_length_b                   7.5774(7)
_cell_length_c                   11.7526(15)
_cell_measurement_reflns_used    6581
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      25.92
_cell_measurement_theta_min      3.25
_cell_volume                     1228.5(3)
_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 (Version 2.2; 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 0.996
_diffrn_measured_fraction_theta_max 0.996
_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  0.2214
_diffrn_reflns_av_sigmaI/netI    0.0995
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            15453
_diffrn_reflns_theta_full        25.03
_diffrn_reflns_theta_max         25.03
_diffrn_reflns_theta_min         3.24
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.294
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.345
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             520
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.582
_refine_diff_density_min         -0.529
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.107
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     167
_refine_ls_number_reflns         2149
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.107
_refine_ls_R_factor_all          0.1469
_refine_ls_R_factor_gt           0.1310
_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^)+(0.1194P)^2^+7.1236P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.3237
_refine_ls_wR_factor_ref         0.3333
_reflns_number_gt                1616
_reflns_number_total             2149
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            sk3416.cif
_cod_data_source_block           I
_cod_original_cell_volume        1228.5(2)
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2018300
_cod_database_fobs_code          2018300