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_7203996
_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            'C9 H7 N O3'
_chemical_formula_weight         177.16
_chemical_name_systematic
; 
 ? 
;
_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                 93.243(9)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   7.6880(10)
_cell_length_b                   13.3074(9)
_cell_length_c                   15.144(3)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      14
_cell_measurement_theta_min      10
_cell_volume                     1546.9(4)
_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-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      295(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Enraf Nonius CAD4'
_diffrn_measurement_method       '\w-2q 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  0.0703
_diffrn_reflns_av_sigmaI/netI    0.2005
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            2925
_diffrn_reflns_theta_full        24.96
_diffrn_reflns_theta_max         24.96
_diffrn_reflns_theta_min         2.04
_diffrn_standards_interval_time  7200
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.116
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.893
_exptl_absorpt_correction_type   \y-scans
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.521
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             736
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.250
_refine_diff_density_min         -0.250
_refine_diff_density_rms         0.059
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.929
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     235
_refine_ls_number_reflns         2712
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.929
_refine_ls_R_factor_all          0.2756
_refine_ls_R_factor_gt           0.0599
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0590P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1169
_refine_ls_wR_factor_ref         0.1885
_reflns_number_gt                735
_reflns_number_total             2712
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b003933k.txt
_cod_data_source_block           1611bw2
_cod_depositor_comments
;
The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0590P)^2^+0.0000P] 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^)+(0.0590P)^2^+0.0000P] 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               7203996