The crucial role of C—H···O and C=O···π interactions in the building of three-dimensional structures of dicarboxylic acid‒biimidazole compounds
Gao, Xiao-Li; Lu, Li-Ping; Zhu, Miao-Li; Acta Crystallographica Section C 65 (2009) o123–o127; doi:10.1107/S0108270109005836

data_2017035
_publ_section_title
;
 The crucial role of C---H&#x00B7;&#x00B7;&#x00B7;O and
 C=O&#x00B7;&#x00B7;&#x00B7;\p interactions in the building of
 three-dimensional structures of dicarboxylic acid--biimidazole
 compounds
;
_journal_coeditor_code           FG3076
_journal_issue                   4
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o123
_journal_page_last               o127
_journal_paper_doi               10.1107/S0108270109005836
_journal_volume                  65
_journal_year                    2009
_chemical_formula_iupac          'C6 H8 N4 2+, C3 H2 O4 2-'
_chemical_formula_moiety         'C6 H8 N4 2+, C3 H2 O4 2-'
_chemical_formula_sum            'C9 H10 N4 O4'
_chemical_formula_weight         238.21
_chemical_name_systematic
;
2,2'-biimidazol-1-ium malonate
;
_space_group_IT_number           13
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yc'
_symmetry_space_group_name_H-M   'P 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                 124.517(18)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   15.663(5)
_cell_length_b                   4.4319(14)
_cell_length_c                   18.221(4)
_cell_measurement_reflns_used    2156
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      26.57
_cell_measurement_theta_min      2.6
_cell_volume                     1042.2(6)
_computing_cell_refinement       'SAINT (Bruker, 2000)'
_computing_data_collection       'SMART (Bruker, 2000)'
_computing_data_reduction        'SAINT (Bruker, 2000)'
_computing_molecular_graphics    'SHELXTL/PC (Version 6.10; Sheldrick, 2008)'
_computing_publication_material
;
SHELXTL/PC (Version 6.10; Sheldrick, 2008) and Ortep3 (Farrugia,
1997)
;
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      298(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'SMART 1K CCD area detector'
_diffrn_measurement_method       \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  0.0140
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_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -18
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_diffrn_reflns_limit_k_min       -4
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            4027
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.58
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.122
_exptl_absorpt_correction_T_max  0.9528
_exptl_absorpt_correction_T_min  0.8450
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Sheldrick, 2000)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.518
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             496
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_exptl_crystal_size_mid          0.40
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_refine_ls_R_factor_gt           0.0408
_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^)+(0.0737P)^2^+0.1574P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1185
_refine_ls_wR_factor_ref         0.1223
_reflns_number_gt                1519
_reflns_number_total             1841
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            fg3076.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        1042.2(5)
_cod_original_sg_symbol_H-M      'P 2/c'
_cod_database_code               2017035
_cod_database_fobs_code          2017035