2-Methylimidazolium hydrogen maleate
Liu, Zhi-Xiong; Acta Crystallographica Section E 65 (2009) o499–; doi:10.1107/S1600536809004103

data_2221132
_publ_section_title
;
 2-Methylimidazolium hydrogen maleate
;
_journal_coeditor_code           LH2769
_journal_issue                   3
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o499
_journal_paper_doi               10.1107/S1600536809004103
_journal_volume                  65
_journal_year                    2009
_chemical_formula_iupac          'C4 H7 N2 +, C4 H3 O4 -'
_chemical_formula_moiety         'C4 H7 N2 +, C4 H3 O4 -'
_chemical_formula_sum            'C8 H10 N2 O4'
_chemical_formula_weight         198.18
_chemical_name_systematic
;
2-Methylimidazolium hydrogen maleate
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/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                 108.310(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   13.9897(14)
_cell_length_b                   7.2274(7)
_cell_length_c                   20.533(2)
_cell_measurement_reflns_used    1457
_cell_measurement_temperature    295(2)
_cell_measurement_theta_max      21.41
_cell_measurement_theta_min      3.07
_cell_volume                     1971.0(3)
_computing_cell_refinement       'SAINT-Plus (Bruker, 2001)'
_computing_data_collection       'SMART (Bruker, 2001)'
_computing_data_reduction        'SAINT-Plus (Bruker, 2001)'
_computing_molecular_graphics    'PLATON (Spek, 2003)'
_computing_publication_material  'PLATON (Spek, 2003)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      295(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'Bruker SMART APEX CCD area-detector'
_diffrn_measurement_method       '0.3\% wide \w exposures'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine focus sealed Siemens Mo tube'
_diffrn_radiation_type           'Mo k\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0273
_diffrn_reflns_av_sigmaI/netI    0.0286
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            7461
_diffrn_reflns_theta_full        27.00
_diffrn_reflns_theta_max         27.00
_diffrn_reflns_theta_min         2.09
_exptl_absorpt_coefficient_mu    0.109
_exptl_absorpt_correction_T_max  0.9914
_exptl_absorpt_correction_T_min  0.9792
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Sheldrick, 2001)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.336
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             832
_exptl_crystal_size_max          0.10
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.169
_refine_diff_density_min         -0.131
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.994
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     137
_refine_ls_number_reflns         2143
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.994
_refine_ls_R_factor_all          0.0821
_refine_ls_R_factor_gt           0.0456
_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^)+(0.0703P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1167
_refine_ls_wR_factor_ref         0.1298
_reflns_number_gt                1273
_reflns_number_total             2143
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            lh2769.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_cell_volume        1970.9(3)
_cod_original_sg_symbol_H-M      'C 2/c'
_cod_database_code               2221132
_cod_database_fobs_code          2221132