4-Carboxy-2-methyl-1<i>H</i>-imidazol-3-ium-5-carboxylate monohydrate
Guo, Yu-Ping; Acta Crystallographica Section E 65 (2009) o22–; doi:10.1107/S1600536808040221

data_2220659
_publ_section_title
;
 4-Carboxy-2-methyl-1<i>H</i>-imidazol-3-ium-5-carboxylate monohydrate
;
_journal_coeditor_code           WN2295
_journal_issue                   1
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o22
_journal_paper_doi               10.1107/S1600536808040221
_journal_volume                  65
_journal_year                    2009
_chemical_formula_iupac          'C6 H6 N2 O4, H2 O1'
_chemical_formula_moiety         'C6 H6 N2 O4, H2 O1'
_chemical_formula_sum            'C6 H8 N2 O5'
_chemical_formula_weight         188.14
_chemical_name_systematic
;
4-Carboxy-2-methyl-1<i>H</i>-imidazol-3-ium-5-carboxylate monohydrate
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_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                 97.386(5)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   8.491(2)
_cell_length_b                   14.280(4)
_cell_length_c                   6.5385(17)
_cell_measurement_reflns_used    927
_cell_measurement_temperature    295(2)
_cell_measurement_theta_max      24.32
_cell_measurement_theta_min      2.42
_cell_volume                     786.2(4)
_computing_cell_refinement       'SAINT (Bruker, 2002)'
_computing_data_collection       'SMART (Bruker, 2002)'
_computing_data_reduction        'SAINT (Bruker, 2002)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 2008)'
_computing_publication_material  'SHELXTL (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      295(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type
;
Bruker SMART APEX 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  0.0318
_diffrn_reflns_av_sigmaI/netI    0.0355
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       7
_diffrn_reflns_limit_l_min       -8
_diffrn_reflns_number            4506
_diffrn_reflns_theta_full        25.99
_diffrn_reflns_theta_max         25.99
_diffrn_reflns_theta_min         2.42
_exptl_absorpt_coefficient_mu    0.140
_exptl_absorpt_correction_T_max  0.9954
_exptl_absorpt_correction_T_min  0.9685
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Sheldrick, 1996)'
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.589
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             392
_exptl_crystal_size_max          0.23
_exptl_crystal_size_mid          0.09
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.253
_refine_diff_density_min         -0.262
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.054
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     128
_refine_ls_number_reflns         1538
_refine_ls_number_restraints     4
_refine_ls_restrained_S_all      1.053
_refine_ls_R_factor_all          0.0707
_refine_ls_R_factor_gt           0.0560
_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^)+(0.0559P)^2^+0.4711P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1226
_refine_ls_wR_factor_ref         0.1309
_reflns_number_gt                1246
_reflns_number_total             1538
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            wn2295.cif
_cod_data_source_block           I
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 

The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2220659
_cod_database_fobs_code          2220659