Structural phase transitions, and Br···N and Br···Br interactions in 1-phenyl-2-methyl-4-nitro-5-bromoimidazole
Kubicki, Maciej; Acta Crystallographica Section B 60 (2004) 333–342; doi:10.1107/S0108768104005853

data_2102506
_publ_section_title
;
 Structural phase transitions, and Br&#x00B7;&#x00B7;&#x00B7;N and
 Br&#x00B7;&#x00B7;&#x00B7;Br interactions in
 1-phenyl-2-methyl-4-nitro-5-bromoimidazole
;
_journal_issue                   3
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              333
_journal_page_last               342
_journal_paper_doi               10.1107/S0108768104005853
_journal_volume                  60
_journal_year                    2004
_chemical_formula_moiety         'C10 H8 Br N3 O2'
_chemical_formula_sum            'C10 H8 Br N3 O2'
_chemical_formula_weight         282.10
_chemical_name_systematic
;
1-phenyl-4-nitro-5-bromo-imidazole
;
_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
_audit_creation_method           SHELXL-97
_cell_angle_alpha                92.683(13)
_cell_angle_beta                 106.506(12)
_cell_angle_gamma                90.277(12)
_cell_formula_units_Z            2
_cell_length_a                   6.9654(10)
_cell_length_b                   6.8215(10)
_cell_length_c                   11.3983(17)
_cell_measurement_reflns_used    1221
_cell_measurement_temperature    100.0(10)
_cell_measurement_theta_max      22
_cell_measurement_theta_min      4
_cell_volume                     518.60(14)
_computing_cell_refinement       'CrysAlisCCD v.169 (Oxford Diffraction, 2003a)'
_computing_data_collection       'CrysAlisCCD v.169 (Oxford Diffraction, 2003a)'
_computing_data_reduction        'CrysAlisRed v.169 (Oxford Diffraction, 2003b)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR-2002 (Burla et al., 2003)'
_diffrn_ambient_temperature      100.0(10)
_diffrn_measured_fraction_theta_full 0.642
_diffrn_measured_fraction_theta_max 0.571
_diffrn_measurement_device_type  'KUMA KM4CCD four-circle diffractometer'
_diffrn_measurement_method       \w-scan
_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  0.0716
_diffrn_reflns_av_sigmaI/netI    0.0553
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            6344
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         29.93
_diffrn_reflns_theta_min         3.73
_exptl_absorpt_coefficient_mu    3.951
_exptl_absorpt_correction_T_max  0.594
_exptl_absorpt_correction_T_min  0.305
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SORTAV (Blessing, 1989)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.806
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             280
_exptl_crystal_size_max          0.5
_exptl_crystal_size_mid          0.3
_exptl_crystal_size_min          0.1
_refine_diff_density_max         1.820
_refine_diff_density_min         -1.852
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.114
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     146
_refine_ls_number_reflns         1720
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.114
_refine_ls_R_factor_all          0.0605
_refine_ls_R_factor_gt           0.0578
_refine_ls_shift/su_max          0.027
_refine_ls_shift/su_mean         0.005
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0209P)^2^+5.8358P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1600
_refine_ls_wR_factor_ref         0.1613
_reflns_number_gt                1586
_reflns_number_total             1720
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            bk5005.cif
_cod_data_source_block           100K
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               2102506