Crystal structure of a second modification of Pachypodol, C18H16O7
Xu, Chuan-Yan; Dong, Ming-Hong; Ye, Jiang-Hai; Zhao, Chen-Liang; Zou, Juan; Zhang, Jing-Jie; Zeitschrift für Kristallographie - New Crystal Structures 237 (2022) 297–299; doi:10.1515/ncrs-2021-0490

data_8105209
_publ_section_title
;
 Crystal structure of a second modification of Pachypodol, C18H16O7
;
_journal_issue                   2
_journal_name_full
'Zeitschrift f\"ur Kristallographie - New Crystal Structures'
_journal_page_first              297
_journal_page_last               299
_journal_paper_doi               10.1515/ncrs-2021-0490
_journal_volume                  237
_journal_year                    2022
_chemical_formula_moiety         'C18 H16 O7'
_chemical_formula_sum            'C18 H16 O7'
_chemical_formula_weight         344.30
_chemical_name_systematic        5,4'-dihydroxy-3,7,3'-tyimethoxy-flavone
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2018/3
_cell_angle_alpha                90
_cell_angle_beta                 93.0630(10)
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   7.3948(3)
_cell_length_b                   24.2947(9)
_cell_length_c                   17.3201(6)
_cell_measurement_reflns_used    7385
_cell_measurement_temperature    300(2)
_cell_measurement_theta_max      30.609
_cell_measurement_theta_min      2.759
_cell_volume                     3107.2(2)
_computing_cell_refinement       'SAINT (Brucker, 2012)[2]'
_computing_data_collection       'APEX2 (Brucker, 2012)[2]'
_computing_data_reduction        'SAINT (Brucker, 2012)[2]'
_computing_molecular_graphics    'Diamond 4.0[4]'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)[1]'
_computing_structure_refinement  'SHELXL-2018/3 (Sheldrick, 2018)[3]'
_computing_structure_solution    'SHELXT 2014/5 (Sheldrick, 2014)'
_diffrn_ambient_temperature      300(2)
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71076
_diffrn_reflns_av_R_equivalents  0.0331
_diffrn_reflns_av_unetI/netI     0.0186
_diffrn_reflns_Laue_measured_fraction_full 0.996
_diffrn_reflns_Laue_measured_fraction_max 0.996
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       34
_diffrn_reflns_limit_k_min       -34
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            70420
_diffrn_reflns_point_group_measured_fraction_full 0.996
_diffrn_reflns_point_group_measured_fraction_max 0.996
_diffrn_reflns_theta_full        25.243
_diffrn_reflns_theta_max         30.609
_diffrn_reflns_theta_min         2.759
_exptl_absorpt_coefficient_mu    0.114
_exptl_absorpt_correction_T_max  0.7461
_exptl_absorpt_correction_T_min  0.7171
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
 SADABS 2016/2: Krause, L., Herbst-Irmer, R., Sheldrick G.M. & Stalke D.,
 J. Appl. Cryst. 48 (2015) 3-10
;
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.472
_exptl_crystal_description       raphides
_exptl_crystal_F_000             1440
_exptl_crystal_size_max          0.22
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.18
_refine_diff_density_max         0.332
_refine_diff_density_min         -0.183
_refine_diff_density_rms         0.038
_refine_ls_abs_structure_details
;
 Flack x determined using 3170 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_extinction_coef       .
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.032
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     461
_refine_ls_number_reflns         9545
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.032
_refine_ls_R_factor_all          0.0586
_refine_ls_R_factor_gt           0.0427
_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^)+(0.0608P)^2^+0.6890P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1123
_refine_ls_wR_factor_ref         0.1241
_reflns_Friedel_coverage         0.000
_reflns_Friedel_fraction_full    .
_reflns_Friedel_fraction_max     .
_reflns_number_gt                7385
_reflns_number_total             9545
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            suppl_j_ncrs-2021-0490_suppl.cif
_cod_data_source_block           20200109DMHIA_78_0m_a
_cod_depositor_comments
;

2025-04-22
Z value and formula fixed to values more according to usual
chemical conventions.                 miguel
;
_cod_original_formula_sum            'C36 H32 O14'
_cod_original_formula_weight         688.61
_cod_original_formula_units_Z            4
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               8105209
_shelx_shelxl_version_number     2018/3