1<i>H</i>-Imidazol-3-ium-4-carboxylate
Cao, Qiang; Duan, Bao-Rong; Zhu, Bin; Cao, Zhen; Acta Crystallographica Section E 68 (2012) o134–o135; doi:10.1107/S1600536811052998

data_2233232
_publ_section_title
;
 1<i>H</i>-Imidazol-3-ium-4-carboxylate
;
_journal_coeditor_code           LD2040
_journal_issue                   1
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o134
_journal_page_last               o135
_journal_paper_doi               10.1107/S1600536811052998
_journal_volume                  68
_journal_year                    2012
_chemical_formula_iupac          'C4 H4 N2 O2'
_chemical_formula_moiety         'C4 H4 N2 O2'
_chemical_formula_sum            'C4 H4 N2 O2'
_chemical_formula_weight         112.09
_chemical_name_systematic
;
1<i>H</i>-Imidazol-3-ium-4-carboxylate
;
_space_group_IT_number           33
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2n'
_symmetry_space_group_name_H-M   'P n a 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                   10.474(6)
_cell_length_b                   11.676(7)
_cell_length_c                   3.674(2)
_cell_measurement_reflns_used    1380
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      26.97
_cell_measurement_theta_min      2.61
_cell_volume                     449.3(4)
_computing_cell_refinement       'SAINT (Bruker, 2008)'
_computing_data_collection       'APEX2 (Bruker, 2008)'
_computing_data_reduction        'SAINT (Bruker, 2008)'
_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      298(2)
_diffrn_measured_fraction_theta_full 0.985
_diffrn_measured_fraction_theta_max 0.985
_diffrn_measurement_device_type  'Bruker APEXII CCD area-detector'
_diffrn_measurement_method       'phi and omega scans'
_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  0.0230
_diffrn_reflns_av_sigmaI/netI    0.0187
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       4
_diffrn_reflns_limit_l_min       -4
_diffrn_reflns_number            2280
_diffrn_reflns_theta_full        25.99
_diffrn_reflns_theta_max         25.99
_diffrn_reflns_theta_min         2.61
_exptl_absorpt_coefficient_mu    0.136
_exptl_absorpt_correction_T_max  0.9759
_exptl_absorpt_correction_T_min  0.9668
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Sheldrick, 1996)'
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.657
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             232
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.21
_exptl_crystal_size_min          0.18
_refine_diff_density_max         0.116
_refine_diff_density_min         -0.189
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.095
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     73
_refine_ls_number_reflns         510
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.093
_refine_ls_R_factor_all          0.0323
_refine_ls_R_factor_gt           0.0293
_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^)+(0.0578P)^2^+0.0406P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0786
_refine_ls_wR_factor_ref         0.0827
_reflns_number_gt                480
_reflns_number_total             510
_reflns_threshold_expression     I>2sigma(I)
_cod_data_source_file            ld2040.cif
_cod_data_source_block           I
_cod_original_cell_volume        449.3(5)
_cod_database_code               2233232
_cod_database_fobs_code          2233232