Redetermination of 2,6-dimethoxybenzoic acid
Portalone, Gustavo; Acta Crystallographica Section E 65 (2009) o327–o328; doi:10.1107/S1600536809001408

data_2220853
_publ_section_title
;
 Redetermination of 2,6-dimethoxybenzoic acid
;
_journal_coeditor_code           KP2203
_journal_issue                   2
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o327
_journal_page_last               o328
_journal_paper_doi               10.1107/S1600536809001408
_journal_volume                  65
_journal_year                    2009
_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
;
2,6-dimethoxybenzoic acid
;
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.12255(13)
_cell_length_b                   8.92296(15)
_cell_length_c                   13.79430(18)
_cell_measurement_reflns_used    75565
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      32.6157
_cell_measurement_theta_min      2.6694
_cell_volume                     876.69(2)
_computing_cell_refinement       'CrysAlis RED (Oxford Diffraction, 2006)'
_computing_data_collection       'CrysAlis CCD (Oxford Diffraction, 2006)'
_computing_data_reduction        'CrysAlis RED (Oxford Diffraction, 2006)'
_computing_molecular_graphics    'ORTEP-3 (Farrugia, 1997)'
_computing_publication_material  'WinGX (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SIR97 (Altomare <i>et al.</i>,  1999)'
_diffrn_ambient_temperature      298(2)
_diffrn_detector_area_resol_mean 16.0696
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Oxford Diffraction Xcalibur S CCD'
_diffrn_measurement_method       '\w and \f'
_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  0.0388
_diffrn_reflns_av_sigmaI/netI    0.0054
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            234729
_diffrn_reflns_theta_full        27.99
_diffrn_reflns_theta_max         27.99
_diffrn_reflns_theta_min         2.72
_diffrn_standards_decay_%        1
_exptl_absorpt_coefficient_mu    0.109
_exptl_absorpt_correction_T_max  0.9990
_exptl_absorpt_correction_T_min  0.9670
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
(CrysAlis RED; Oxford Diffraction, 2006)
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.380
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       tablets
_exptl_crystal_F_000             384
_exptl_crystal_size_max          0.12
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.165
_refine_diff_density_min         -0.202
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.251
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     129
_refine_ls_number_reflns         1246
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.251
_refine_ls_R_factor_all          0.0425
_refine_ls_R_factor_gt           0.0422
_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^)+(0.059P)^2^+0.1016P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1096
_refine_ls_wR_factor_ref         0.1099
_reflns_number_gt                1241
_reflns_number_total             1246
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            kp2203.cif
_cod_data_source_block           I
_cod_database_code               2220853
_cod_database_fobs_code          2220853