#------------------------------------------------------------------------------
#$Date: 2025-08-21 04:34:05 +0300 (Thu, 21 Aug 2025) $
#$Revision: 301843 $
#$URL: file:///home/coder/svn-repositories/cod/cif/4/51/63/4516355.cif $
#------------------------------------------------------------------------------
#
# This file is available in the Crystallography Open Database (COD),
# http://www.crystallography.net/
#
# All data on this site have been placed in the public domain by the
# contributors.
#
data_4516355
loop_
_publ_author_name
'Patyk, Ewa'
'Podsiadło, Marcin'
'Katrusiak, Andrzej'
_publ_section_title
;
 CH···N Bonds and Dynamics in Isostructural
 Pyrimidine Polymorphs
;
_journal_issue                   8
_journal_name_full               'Crystal Growth & Design'
_journal_page_first              4039
_journal_paper_doi               10.1021/acs.cgd.5b00657
_journal_volume                  15
_journal_year                    2015
_chemical_formula_moiety         'C4 H4 N2'
_chemical_formula_sum            'C4 H4 N2'
_chemical_formula_weight         80.09
_chemical_melting_point          293.15
_chemical_name_common            pyrimidine
_chemical_name_systematic
; 
pyrimidine phase I
;
_space_group_IT_number           33
_space_group_name_Hall           'P 2c -2n'
_space_group_name_H-M_alt        'P n a 21'
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2n'
_symmetry_space_group_name_H-M   'P n a 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.667(6)
_cell_length_b                   9.491(5)
_cell_length_c                   3.7874(15)
_cell_measurement_reflns_used    3066
_cell_measurement_temperature    245.0(1)
_cell_measurement_theta_max      28.28
_cell_measurement_theta_min      3.49
_cell_volume                     419.4(4)
_computing_cell_refinement       'CrysAlisRED (Oxford Diffraction, 2004)'
_computing_data_collection       'CrysAlisCCD (Oxford Diffraction, 2004)'
_computing_data_reduction        'CrysAlisRED (Oxford Diffraction, 2004)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 1990)'
_computing_publication_material  'SHELXL--97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL--97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS--97 (Sheldrick, 1997)'
_diffrn_ambient_pressure         100
_diffrn_ambient_temperature      245.0(1)
_diffrn_measured_fraction_theta_full 0.901
_diffrn_measured_fraction_theta_max 0.901
_diffrn_measurement_device_type  'KM-4 CCD'
_diffrn_measurement_method       ω-scans
_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  0.0982
_diffrn_reflns_av_sigmaI/netI    0.0956
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       4
_diffrn_reflns_limit_l_min       -4
_diffrn_reflns_number            3066
_diffrn_reflns_theta_full        28.28
_diffrn_reflns_theta_max         28.28
_diffrn_reflns_theta_min         3.49
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.084
_exptl_absorpt_correction_T_max  0.983
_exptl_absorpt_correction_T_min  0.983
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details
; 
 Correction for absorption was made using XEMP (SHELXTL, 
 Sheldrick (1990)).
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.268
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       irregular
_exptl_crystal_F_000             168
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.140
_refine_diff_density_min         -0.177
_refine_diff_density_rms         0.039
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -1(10)
_refine_ls_extinction_coef       0.042(8)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc²λ³/sin(2θ)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.034
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     56
_refine_ls_number_reflns         894
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.033
_refine_ls_R_factor_all          0.1697
_refine_ls_R_factor_gt           0.0630
_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/[σ²(Fo²)+(0.0371P)²+0.0000P] where P=(Fo²+2Fc²)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1161
_refine_ls_wR_factor_ref         0.1665
_reflns_number_gt                379
_reflns_number_total             894
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            cg5b00657_si_002.cif
_cod_data_source_block           phaseI_245K
_cod_database_code               4516355
loop_
_symmetry_equiv_pos_as_xyz
'x, y, z'
'-x, -y, z+1/2'
'x+1/2, -y+1/2, z'
'-x+1/2, y+1/2, z+1/2'
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
_atom_site_adp_type
_atom_site_occupancy
_atom_site_symmetry_multiplicity
_atom_site_calc_flag
_atom_site_refinement_flags
N1 N 0.1278(4) 0.3961(4) 0.0235(16) 0.0655(14) Uani 1 1 d .
N3 N 0.0122(4) 0.1905(4) 0.0153(13) 0.0693(16) Uani 1 1 d .
C2 C 0.0313(4) 0.3256(5) 0.0720(19) 0.0627(17) Uani 1 1 d .
H2 H -0.0305 0.3776 0.1561 0.075 Uiso 1 1 calc R
C4 C 0.1020(5) 0.1194(5) -0.1029(17) 0.0707(19) Uani 1 1 d .
H4 H 0.0934 0.0237 -0.1486 0.085 Uiso 1 1 calc R
C5 C 0.2064(5) 0.1795(5) -0.1610(15) 0.0659(18) Uani 1 1 d .
H5 H 0.2685 0.1272 -0.2421 0.079 Uiso 1 1 calc R
C6 C 0.2151(5) 0.3201(5) -0.0940(12) 0.066(2) Uani 1 1 d .
H6 H 0.2850 0.3646 -0.1323 0.079 Uiso 1 1 calc R
loop_
_atom_type_symbol
_atom_type_description
_atom_type_scat_dispersion_real
_atom_type_scat_dispersion_imag
_atom_type_scat_source
C C 0.0033 0.0016 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
H H 0.0000 0.0000 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
N N 0.0061 0.0033 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
loop_
_geom_angle_atom_site_label_1
_geom_angle_atom_site_label_2
_geom_angle_atom_site_label_3
_geom_angle
C2 N1 C6 115.2(4)
C2 N3 C4 114.6(4)
N3 C2 N1 127.8(5)
N3 C4 C5 123.3(5)
C6 C5 C4 116.5(5)
N1 C6 C5 122.6(5)
loop_
_geom_bond_atom_site_label_1
_geom_bond_atom_site_label_2
_geom_bond_distance
N1 C2 1.322(6)
N1 C6 1.324(6)
N3 C2 1.320(5)
N3 C4 1.324(6)
C4 C5 1.363(6)
C5 C6 1.363(6)
loop_
_cod_related_entry_id
_cod_related_entry_database
_cod_related_entry_code
1 PubChem 9260
