2-(Carboxymethyl)-4,6-dimethoxybenzoic acid
Ghulam Qadeer; Nasim Hasan Rama; Qing-Shan Li; Acta Crystallographica Section E 62 (2006) o906–o907; doi:10.1107/S1600536806003345

data_2208408
_publ_section_title
;
 2-(Carboxymethyl)-4,6-dimethoxybenzoic acid
;
_journal_coeditor_code           RZ6167
_journal_issue                   3
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o906
_journal_page_last               o907
_journal_paper_doi               10.1107/S1600536806003345
_journal_volume                  62
_journal_year                    2006
_chemical_formula_iupac          'C11 H12 O6'
_chemical_formula_moiety         'C11 H12 O6'
_chemical_formula_sum            'C11 H12 O6'
_chemical_formula_weight         240.21
_chemical_melting_point          170
_chemical_name_common
;
3,5-dimthoxyhomophthalic acid
;
_chemical_name_systematic
;
2-(Carboxymethyl)-4,6-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
_cell_angle_alpha                105.937(2)
_cell_angle_beta                 103.444(2)
_cell_angle_gamma                93.211(2)
_cell_formula_units_Z            2
_cell_length_a                   7.2886(10)
_cell_length_b                   7.9631(11)
_cell_length_c                   10.2758(14)
_cell_measurement_reflns_used    2688
_cell_measurement_temperature    292(2)
_cell_measurement_theta_max      28.17
_cell_measurement_theta_min      2.68
_cell_volume                     553.17(13)
_computing_cell_refinement       'SAINT (Bruker, 1999)'
_computing_data_collection       'SMART (Bruker, 1998)'
_computing_data_reduction        SAINT
_computing_molecular_graphics    'SHELXTL (Bruker, 1999)'
_computing_publication_material  SHELXTL
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      292(2)
_diffrn_measured_fraction_theta_full 0.981
_diffrn_measured_fraction_theta_max 0.981
_diffrn_measurement_device_type  'Bruker SMART CCD area-detector'
_diffrn_measurement_method       '\f and \w'
_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  0.0475
_diffrn_reflns_av_sigmaI/netI    0.0351
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            4782
_diffrn_reflns_theta_full        27.00
_diffrn_reflns_theta_max         27.00
_diffrn_reflns_theta_min         2.13
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.119
_exptl_absorpt_correction_T_max  0.9766
_exptl_absorpt_correction_T_min  0.9660
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Sheldrick, 1996)'
_exptl_crystal_colour            'light yellow'
_exptl_crystal_density_diffrn    1.442
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             252
_exptl_crystal_size_max          0.24
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.235
_refine_diff_density_min         -0.191
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.079
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     162
_refine_ls_number_reflns         2380
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.079
_refine_ls_R_factor_all          0.0493
_refine_ls_R_factor_gt           0.0437
_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^)+(0.0658P)^2^+0.0652P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1208
_refine_ls_wR_factor_ref         0.1255
_reflns_number_gt                2074
_reflns_number_total             2380
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            rz6167.cif
_cod_data_source_block           I
_cod_database_code               2208408
_cod_database_fobs_code          2208408