Methyl 7-methoxy-9-oxo-9<i>H</i>-xanthene-2-carboxylate
Niedziałkowski, Paweł; Ossowski, Tadeusz; Sikorski, Artur; Acta Crystallographica Section E 65 (2009) o484–o485; doi:10.1107/S1600536809003602

data_2221225
_publ_section_title
;
 Methyl 7-methoxy-9-oxo-9<i>H</i>-xanthene-2-carboxylate
;
_journal_coeditor_code           XU2476
_journal_issue                   3
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o484
_journal_page_last               o485
_journal_paper_doi               10.1107/S1600536809003602
_journal_volume                  65
_journal_year                    2009
_chemical_formula_iupac          'C16 H12 O5'
_chemical_formula_moiety         'C16 H12 O5'
_chemical_formula_sum            'C16 H12 O5'
_chemical_formula_weight         284.26
_chemical_name_systematic
;
Methyl 7-methoxy-9-oxo-9H-xanthene-2-carboxylate
;
_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           SHELXL97
_cell_angle_alpha                90.00
_cell_angle_beta                 93.266(7)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   4.7709(4)
_cell_length_b                   10.5375(8)
_cell_length_c                   26.7854(19)
_cell_measurement_reflns_used    2126
_cell_measurement_temperature    295(2)
_cell_measurement_theta_max      25.00
_cell_measurement_theta_min      2.99
_cell_volume                     1344.40(18)
_computing_cell_refinement       'CrysAlis RED (Oxford Diffraction, 2008)'
_computing_data_collection       'CrysAlis CCD (Oxford Diffraction, 2008)'
_computing_data_reduction        'CrysAlis RED (Oxford Diffraction, 2008)'
_computing_molecular_graphics    'ORTEPII (Johnson, 1976)'
_computing_publication_material
'SHELXL97 (Sheldrick, 2008) and PLATON (Spek, 2003)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      295(2)
_diffrn_detector_area_resol_mean 10.4002
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Oxford Diffraction Ruby CCD'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Enhance (Mo) X-ray Source'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0856
_diffrn_reflns_av_sigmaI/netI    0.0662
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       31
_diffrn_reflns_limit_l_min       -31
_diffrn_reflns_number            23842
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         2.99
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.105
_exptl_absorpt_correction_T_max  0.997
_exptl_absorpt_correction_T_min  0.994
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(CrysAlis RED; Oxford Diffraction, 2008)'
_exptl_crystal_colour            white
_exptl_crystal_density_diffrn    1.404
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             592.0
_exptl_crystal_size_max          0.2
_exptl_crystal_size_mid          0.04
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.129
_refine_diff_density_min         -0.135
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.805
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     193
_refine_ls_number_reflns         2366
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.805
_refine_ls_R_factor_all          0.1052
_refine_ls_R_factor_gt           0.0382
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w = 1/[\s^2^(Fo^2^)+(0.0471P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0824
_refine_ls_wR_factor_ref         0.0924
_reflns_number_gt                1051
_reflns_number_total             2366
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            xu2476.cif
_cod_data_source_block           I
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2221225
_cod_database_fobs_code          2221225