Dimorphic forms of 3,6-dinitrodurene in a single space group
Galicia Aguilar, José Alberto; Bernès, Sylvain; Acta Crystallographica Section C 65 (2009) o176–o178; doi:10.1107/S0108270109008439

data_2017070
_publ_section_title
;
 Dimorphic forms of 3,6-dinitrodurene in a single space group
;
_journal_coeditor_code           SQ3188
_journal_issue                   4
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o176
_journal_page_last               o178
_journal_paper_doi               10.1107/S0108270109008439
_journal_volume                  65
_journal_year                    2009
_chemical_formula_iupac          'C10 H12 N2 O4'
_chemical_formula_moiety         'C10 H12 N2 O4'
_chemical_formula_sum            'C10 H12 N2 O4'
_chemical_formula_weight         224.22
_chemical_melting_point          486.3
_chemical_name_common            3,6-Dinitrodurene
_chemical_name_systematic
;
1,2,4,5-tetramethyl-3,6-dinitrobenzene
;
_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   difmap
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.00
_cell_angle_beta                 101.300(13)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   8.9592(19)
_cell_length_b                   15.313(3)
_cell_length_c                   16.136(4)
_cell_measurement_pressure       101(2)
_cell_measurement_reflns_used    65
_cell_measurement_temperature    298.0(10)
_cell_measurement_theta_max      12.13
_cell_measurement_theta_min      5.08
_cell_volume                     2170.8(8)
_computing_cell_refinement       'XSCANS (Siemens, 1996)'
_computing_data_collection       'XSCANS (Siemens, 1996)'
_computing_data_reduction        'XSCANS (Siemens, 1996)'
_computing_molecular_graphics
'SHELXL97 (Sheldrick, 2008) and Mercury (Macrae <i>et al.</i>,  2008)'
_computing_publication_material  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      298.0(10)
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Bruker P4'
_diffrn_measurement_method       2\q/\w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0357
_diffrn_reflns_av_sigmaI/netI    0.0352
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            6214
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         27.50
_diffrn_reflns_theta_min         2.57
_diffrn_standards_decay_%        1.5
_diffrn_standards_interval_count 97
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.107
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            'light violet'
_exptl_crystal_density_diffrn    1.372
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       irregular
_exptl_crystal_F_000             944
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.16
_refine_diff_density_max         0.188
_refine_diff_density_min         -0.142
_refine_ls_extinction_coef       0.0079(14)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL97 (Sheldrick, 2008)'
_refine_ls_goodness_of_fit_ref   1.063
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_constraints    0
_refine_ls_number_parameters     223
_refine_ls_number_reflns         2492
_refine_ls_number_restraints     48
_refine_ls_restrained_S_all      1.055
_refine_ls_R_factor_all          0.0950
_refine_ls_R_factor_gt           0.0508
_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^)+(0.0599P)^2^+0.8126P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1295
_refine_ls_wR_factor_ref         0.1521
_reflns_number_gt                1423
_reflns_number_total             2492
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            sq3188.cif
_cod_data_source_block           polymorph_II
_cod_original_cell_volume        2170.8(9)
_cod_original_sg_symbol_H-M      'C 2/c'
_cod_database_code               2017070