2-Methyl-4,5-dinitroimidazole
Gilardi, Richard; Evans, Robin N.; Acta Crystallographica Section E 59 (2003) o1349–o1350; doi:10.1107/S160053680301701X

data_2202793
_publ_section_title
;
 2-Methyl-4,5-dinitroimidazole
;
_journal_issue                   9
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o1349
_journal_page_last               o1350
_journal_paper_doi               10.1107/S160053680301701X
_journal_volume                  59
_journal_year                    2003
_chemical_formula_iupac          'C4 H4 N4 O4'
_chemical_formula_moiety         'C4 H4 N4 O4'
_chemical_formula_sum            'C4 H4 N4 O4'
_chemical_formula_weight         172.11
_chemical_melting_point          480
_chemical_name_systematic
;
2-methyl-4,5-dinitroimidazole
;
_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                70.702(2)
_cell_angle_beta                 71.205(2)
_cell_angle_gamma                72.983(2)
_cell_formula_units_Z            4
_cell_length_a                   7.9962(9)
_cell_length_b                   8.2860(9)
_cell_length_c                   11.8913(13)
_cell_measurement_reflns_used    1898
_cell_measurement_temperature    153(2)
_cell_measurement_theta_max      26.281
_cell_measurement_theta_min      2.663
_cell_volume                     688.50(13)
_computing_cell_refinement       'SAINT (Bruker, 2001)'
_computing_data_collection       'SMART (Bruker, 2001)'
_computing_data_reduction        SAINT
_computing_molecular_graphics    SHELXTL
_computing_publication_material  SHELXTL
_computing_structure_refinement  'SHELXTL (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      93(2)
_diffrn_measured_fraction_theta_full 0.992
_diffrn_measured_fraction_theta_max 0.992
_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  0.0413
_diffrn_reflns_av_sigmaI/netI    0.0952
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            4569
_diffrn_reflns_theta_full        26.39
_diffrn_reflns_theta_max         26.39
_diffrn_reflns_theta_min         1.87
_diffrn_standards_decay_%        none
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.149
_exptl_absorpt_correction_T_max  0.9941
_exptl_absorpt_correction_T_min  0.9380
_exptl_absorpt_correction_type   integration
_exptl_absorpt_process_details   '(Wuensch et al., 1965)'
_exptl_crystal_colour            'pale yellow'
_exptl_crystal_density_diffrn    1.660
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             352
_exptl_crystal_size_max          0.45
_exptl_crystal_size_mid          0.1
_exptl_crystal_size_min          0.03
_refine_diff_density_max         0.246
_refine_diff_density_min         -0.241
_refine_ls_extinction_coef       0.0050(13)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXTL
_refine_ls_goodness_of_fit_ref   0.864
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     235
_refine_ls_number_reflns         2785
_refine_ls_number_restraints     5
_refine_ls_restrained_S_all      0.865
_refine_ls_R_factor_all          0.0829
_refine_ls_R_factor_gt           0.0397
_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^)+(0.0255P)^2^] where P = (Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0720
_refine_ls_wR_factor_ref         0.0803
_reflns_number_gt                1679
_reflns_number_total             2785
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ob6274.cif
_cod_data_source_block           I
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
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 'Triclinic' changed to 'triclinic'
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 

The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not measured' was changed to '?'
- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_original_sg_symbol_Hall     '-P 1 '
_cod_database_code               2202793
_cod_database_fobs_code          2202793