2,3,6,7-Tetramethoxy-9,10-anthraquinone
Ohta, Akira; Hattori, Kazuki; Kawase, Takeshi; Kobayashi, Takashi; Naito, Hiroyoshi; Kitamura, Chitoshi; Acta Crystallographica Section E 68 (2012) o2587–; doi:10.1107/S1600536812033119

data_2235810
_publ_section_title
;
 2,3,6,7-Tetramethoxy-9,10-anthraquinone
;
_journal_coeditor_code           GG2091
_journal_issue                   8
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o2587
_journal_paper_doi               10.1107/S1600536812033119
_journal_volume                  68
_journal_year                    2012
_chemical_formula_iupac          'C18 H16 O6'
_chemical_formula_moiety         'C18 H16 O6'
_chemical_formula_sum            'C18 H16 O6'
_chemical_formula_weight         328.31
_chemical_name_systematic
;
2,3,6,7-Tetramethoxy-9,10-anthraquinone
;
_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
_cell_angle_alpha                94.859(3)
_cell_angle_beta                 91.410(2)
_cell_angle_gamma                97.278(2)
_cell_formula_units_Z            1
_cell_length_a                   4.6607(4)
_cell_length_b                   8.4769(9)
_cell_length_c                   9.8110(9)
_cell_measurement_reflns_used    1977
_cell_measurement_temperature    223
_cell_measurement_theta_max      27.485
_cell_measurement_theta_min      3.06
_cell_volume                     382.87(6)
_computing_cell_refinement       'PROCESS-AUTO (Rigaku, 1998)'
_computing_data_collection       'RAPID-AUTO (Rigaku, 1999)'
_computing_data_reduction        'PROCESS-AUTO (Rigaku, 1998)'
_computing_molecular_graphics    'ORTEP-3 for Windows (Farrugia, 1997)'
_computing_publication_material  'WinGX (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SIR2004 (Burla <i>et al.</i>, 2005)'
_diffrn_ambient_temperature      223
_diffrn_detector_area_resol_mean 10
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.991
_diffrn_measurement_device_type  'Rigaku R-AXIS RAPID'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0271
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            3738
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         3.06
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.108
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.424
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             172
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.06
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.39
_refine_diff_density_min         -0.44
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.156
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     111
_refine_ls_number_reflns         1725
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.156
_refine_ls_R_factor_all          0.1068
_refine_ls_R_factor_gt           0.0544
_refine_ls_shift/su_max          0
_refine_ls_shift/su_mean         0
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.1038P)^2^+0.301P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1513
_refine_ls_wR_factor_ref         0.2335
_reflns_number_gt                977
_reflns_number_total             1725
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            gg2091.cif
_cod_data_source_block           I
_cod_database_code               2235810
_cod_database_fobs_code          2235810