2,4-Dimethoxybenzoic acid and 2,5-dimethoxybenzoic acid
Barich, Dewey H.; Zell, Mark T.; Powell, Douglas R.; Munson, Eric J.; Acta Crystallographica Section C 60 (2004) o261–o262; doi:10.1107/S0108270104003063

data_2013974
_publ_section_title
;
 2,4-Dimethoxybenzoic acid and 2,5-dimethoxybenzoic acid
;
_journal_issue                   4
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o261
_journal_page_last               o262
_journal_paper_doi               10.1107/S0108270104003063
_journal_volume                  60
_journal_year                    2004
_chemical_formula_iupac          'C9 H10 O4'
_chemical_formula_moiety         'C9 H10 O4'
_chemical_formula_sum            'C9 H10 O4'
_chemical_formula_weight         182.17
_chemical_name_systematic        '2,4-dimethoxybenzoic acid'
_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                94.995(4)
_cell_angle_beta                 95.894(4)
_cell_angle_gamma                96.759(4)
_cell_formula_units_Z            2
_cell_length_a                   6.7602(13)
_cell_length_b                   7.7124(15)
_cell_length_c                   8.0237(15)
_cell_measurement_reflns_used    1306
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      26.00
_cell_measurement_theta_min      2.56
_cell_volume                     411.14(14)
_computing_cell_refinement       SMART
_computing_data_collection       'SMART (Bruker, 1998)'
_computing_data_reduction        'SAINT (Bruker, 1998)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 1997)'
_computing_publication_material  SHELXTL
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.964
_diffrn_measured_fraction_theta_max 0.964
_diffrn_measurement_device_type  'Bruker SMART APEX'
_diffrn_measurement_method       '\w scan'
_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  0.0118
_diffrn_reflns_av_sigmaI/netI    0.0241
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       7
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            2584
_diffrn_reflns_theta_full        25.99
_diffrn_reflns_theta_max         25.99
_diffrn_reflns_theta_min         2.56
_diffrn_standards_decay_%        <2
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.117
_exptl_absorpt_correction_T_max  0.9954
_exptl_absorpt_correction_T_min  0.9748
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Sheldrick, 2000)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.472
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             192
_exptl_crystal_size_max          0.22
_exptl_crystal_size_mid          0.17
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.373
_refine_diff_density_min         -0.426
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.041
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     121
_refine_ls_number_reflns         1563
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.041
_refine_ls_R_factor_all          0.0554
_refine_ls_R_factor_gt           0.0465
_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^)+(0.1P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1278
_refine_ls_wR_factor_ref         0.1355
_reflns_number_gt                1298
_reflns_number_total             1563
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            fr1460.cif
_cod_data_source_block           I
_cod_database_code               2013974
_cod_database_fobs_code          2013974