The observed and energetically feasible crystal structures of 5-substituted uracils
Barnett, Sarah A.; Hulme, Ashley T.; Issa, Nizar; Lewis, Thomas C.; Price, Louise S.; Tocher, Derek A.; Price, Sarah L.; New Journal of Chemistry 32 (2008) 1761–; doi:10.1039/b806763e

data_7052012
_publ_section_title
;
 The observed and energetically feasible crystal structures of
 5-substituted uracils
;
_journal_issue                   10
_journal_name_full               'New Journal of Chemistry'
_journal_page_first              1761
_journal_paper_doi               10.1039/b806763e
_journal_volume                  32
_journal_year                    2008
_chemical_formula_moiety         'C5 H6 F N3 O3 '
_chemical_formula_sum            'C5 H6 F N3 O3'
_chemical_formula_weight         175.13
_chemical_name_common            'C4 H3 F N2 O2 , C H3 N O'
_chemical_name_systematic
;
5-Fluorouracil Formaide solvate (1/1)
;
_space_group_IT_number           11
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yb'
_symmetry_space_group_name_H-M   'P 1 21/m 1'
_atom_sites_solution_hydrogens   difmap
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.313(8)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   6.827(4)
_cell_length_b                   6.111(3)
_cell_length_c                   8.424(4)
_cell_measurement_reflns_used    1298
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      27.6775
_cell_measurement_theta_min      2.418
_cell_volume                     351.4(3)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL and local programs'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.979
_diffrn_measured_fraction_theta_max 0.909
_diffrn_measurement_device_type  'Bruker SMART APEX diffractometer'
_diffrn_measurement_method       '\w rotation with narrow frames'
_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  0.0243
_diffrn_reflns_av_sigmaI/netI    0.0242
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            2892
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         28.28
_diffrn_reflns_theta_min         2.42
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.153
_exptl_absorpt_correction_T_max  0.9774
_exptl_absorpt_correction_T_min  0.9512
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS, (Sheldrick, 1996)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.655
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             180
_exptl_crystal_size_max          0.33
_exptl_crystal_size_mid          0.26
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.433
_refine_diff_density_min         -0.283
_refine_diff_density_rms         0.053
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.096
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     92
_refine_ls_number_reflns         866
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.096
_refine_ls_R_factor_all          0.0476
_refine_ls_R_factor_gt           0.0407
_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^)+(0.0597P)^2^+0.1250P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1061
_refine_ls_wR_factor_ref         0.1108
_reflns_number_gt                765
_reflns_number_total             866
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            b806763e.txt
_cod_data_source_block           STR0469
_cod_original_sg_symbol_H-M      P21/m
_cod_original_formula_sum        'C5 H6 F N3 O3 '
_cod_database_code               7052012