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_7203995
_publ_section_title
;
 Mesoionic pyridopyrimidinylium and pyridooxazinylium olates and
 non-mesoionic pyridopyrimidinones. Structures in the solid state,
 solution, and matrices&#x200A;&#x2020;
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_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            'C14 H10 N2 O2'
_chemical_formula_weight         238.24
_chemical_name_systematic
;
 ?
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                98.2600(10)
_cell_angle_beta                 101.0860(10)
_cell_angle_gamma                101.8710(10)
_cell_formula_units_Z            2
_cell_length_a                   6.52870(10)
_cell_length_b                   7.30040(10)
_cell_length_c                   12.07350(10)
_cell_measurement_reflns_used    4409
_cell_measurement_temperature    203(2)
_cell_measurement_theta_max      28.21
_cell_measurement_theta_min      2.90
_cell_volume                     542.483(13)
_computing_cell_refinement       'Siemens SMART (Siemens, 1994a)'
_computing_data_collection       'Siemens SMART (Siemens, 1994a)'
_computing_data_reduction        'Siemens SHELXTL (Siemens, 1994b)'
_computing_molecular_graphics    'Siemens SHELXTL (Siemens, 1994b)'
_computing_publication_material  'Siemens SHELXTL (Siemens, 1994b)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      203(2)
_diffrn_measured_fraction_theta_full 0.894
_diffrn_measured_fraction_theta_max 0.894
_diffrn_measurement_device_type  'Siemens SMART CCD'
_diffrn_measurement_method       '\w 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  0.0134
_diffrn_reflns_av_sigmaI/netI    0.0204
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            2396
_diffrn_reflns_theta_full        28.21
_diffrn_reflns_theta_max         28.21
_diffrn_reflns_theta_min         2.90
_diffrn_standards_decay_%        0
_exptl_absorpt_coefficient_mu    0.100
_exptl_absorpt_correction_T_max  0.9803
_exptl_absorpt_correction_T_min  0.9489
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(Blessing, 1995)'
_exptl_crystal_colour            Yellow
_exptl_crystal_density_diffrn    1.459
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Needle
_exptl_crystal_F_000             248
_exptl_crystal_size_max          0.53
_exptl_crystal_size_mid          0.24
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.287
_refine_diff_density_min         -0.184
_refine_diff_density_rms         0.040
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.065
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     203
_refine_ls_number_reflns         2396
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.065
_refine_ls_R_factor_all          0.0414
_refine_ls_R_factor_gt           0.0360
_refine_ls_shift/su_max          0.021
_refine_ls_shift/su_mean         0.002
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0660P)^2^+0.0657P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1035
_refine_ls_wR_factor_ref         0.1062
_reflns_number_gt                2074
_reflns_number_total             2396
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b003933k.txt
_cod_data_source_block           olate
_cod_depositor_comments
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The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0660P)^2^+0.0657P] 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^)+(0.0660P)^2^+0.0657P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_cell_volume        542.482(12)
_cod_database_code               7203995