Mesoionic pyridopyrimidinylium and pyridooxazinylium olates and non-mesoionic pyridopyrimidinones. Structures in the solid state, solution, and matrices †
Plüg, Carsten; Wallfisch, Bianca; Gade Andersen, Heidi; Bernhardt, Paul V.; Baker, Lisa-Jane; Clark, George R.; Wah Wong, Ming; Wentrup, Curt; Journal of the Chemical Society, Perkin Transactions 2  (2000) 2096–; doi:10.1039/b003933k

data_7203999
_publ_section_title
;
 Mesoionic pyridopyrimidinylium and pyridooxazinylium olates and
 non-mesoionic pyridopyrimidinones. Structures in the solid state,
 solution, and matrices&#x200A;&#x2020;
;
_journal_issue                   10
_journal_name_full
'Journal of the Chemical Society, Perkin Transactions 2'
_journal_page_first              2096
_journal_paper_doi               10.1039/b003933k
_journal_year                    2000
_chemical_formula_sum            'C13 H10 N4 O'
_chemical_formula_weight         238.25
_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                 100.670(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.868(3)
_cell_length_b                   8.7030(10)
_cell_length_c                   11.834(4)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      14
_cell_measurement_theta_min      10
_cell_volume                     1100.0(5)
_computing_cell_refinement       'SET4 in CAD4'
_computing_data_collection       CAD4
_computing_data_reduction        XTAL3.2
_computing_molecular_graphics    PLATON
_computing_publication_material  SHELXL-97
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      295(2)
_diffrn_measured_fraction_theta_full 0.931
_diffrn_measured_fraction_theta_max 0.931
_diffrn_measurement_device_type  'Enraf Nonius CAD4'
_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  0.0285
_diffrn_reflns_av_sigmaI/netI    0.0220
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            2036
_diffrn_reflns_theta_full        24.97
_diffrn_reflns_theta_max         24.97
_diffrn_reflns_theta_min         1.91
_diffrn_standards_interval_time  7200
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.097
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.861
_exptl_absorpt_correction_type   \y-scans
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.439
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             496
_exptl_crystal_size_max          0.6
_exptl_crystal_size_mid          0.6
_exptl_crystal_size_min          0.5
_refine_diff_density_max         0.277
_refine_diff_density_min         -0.124
_refine_diff_density_rms         0.041
_refine_ls_extinction_coef       0.011(2)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.041
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     164
_refine_ls_number_reflns         1929
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.041
_refine_ls_R_factor_all          0.0590
_refine_ls_R_factor_gt           0.0374
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0596P)^2^+0.1856P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0957
_refine_ls_wR_factor_ref         0.1083
_reflns_number_gt                1432
_reflns_number_total             1929
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b003933k.txt
_cod_data_source_block           1617ha1
_cod_depositor_comments
;
The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0596P)^2^+0.1856P] where P=(Fo^2^+2Fc^2^)/3' was
changed to 'calc'. New tag '_refine_ls_weighting_details' was
created. The value of the new tag was set to
'w=1/[\s^2^(Fo^2^)+(0.0596P)^2^+0.1856P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_sg_symbol_H-M      'P 2 1 / c'
_cod_database_code               7203999