Crystal structure of 8-methoxy-2-oxo-2H-chromene-3-carboxylic acid, C11H8O5
Xiaochuan Li; Bingcai Wang; Young-A Son; Jiange Wang; Sheng Wang; Zeitschrift für Kristallographie - New Crystal Structures 225 (2010) 65–; doi:

data_8102603
_publ_section_title
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 Crystal structure of 8-methoxy-2-oxo-2H-chromene-3-carboxylic acid,
 C11H8O5
;
_journal_issue                   1
_journal_name_full
'Zeitschrift f\"ur Kristallographie - New Crystal Structures'
_journal_page_first              65
_journal_volume                  225
_journal_year                    2010
_chemical_formula_sum            'C11 H8 O5'
_chemical_formula_weight         220.17
_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                 100.4680(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   5.1525(6)
_cell_length_b                   19.922(2)
_cell_length_c                   9.4581(11)
_cell_measurement_reflns_used    3718
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      28.25
_cell_measurement_theta_min      2.42
_cell_volume                     954.70(18)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega 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  0.0142
_diffrn_reflns_av_sigmaI/netI    0.0113
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       24
_diffrn_reflns_limit_k_min       -24
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            7127
_diffrn_reflns_theta_full        25.50
_diffrn_reflns_theta_max         25.50
_diffrn_reflns_theta_min         2.42
_exptl_absorpt_coefficient_mu    0.123
_exptl_absorpt_correction_T_max  0.9699
_exptl_absorpt_correction_T_min  0.9489
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.532
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             456
_exptl_crystal_size_max          0.43
_exptl_crystal_size_mid          0.41
_exptl_crystal_size_min          0.25
_refine_diff_density_max         0.219
_refine_diff_density_min         -0.258
_refine_diff_density_rms         0.039
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.037
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     147
_refine_ls_number_reflns         1770
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.037
_refine_ls_R_factor_all          0.0396
_refine_ls_R_factor_gt           0.0355
_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^)+(0.0521P)^2^+0.2876P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0958
_refine_ls_wR_factor_ref         0.1002
_reflns_number_gt                1570
_reflns_number_total             1770
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            1267-2832.cff
_cod_data_source_block           a
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
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 1555 2011-01-17 13:19:09Z saulius 
;
_cod_original_cell_volume        954.70(19)
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               8102603