Three polymorphs of 4-4'-diiodobenzalazine, and 4-chloro-4'-iodobenzalazine
Ojala, Charles R.; Ojala, William H.; Britton, Doyle; Cramer, Christopher J.; Acta Crystallographica Section C 63 (2007) o518–o523; doi:10.1107/S0108270107034786

data_2016140
_publ_section_title
;
 Three polymorphs of 4-4'-diiodobenzalazine, and
 4-chloro-4'-iodobenzalazine
;
_journal_coeditor_code           GA3056
_journal_issue                   9
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o518
_journal_page_last               o523
_journal_paper_doi               10.1107/S0108270107034786
_journal_volume                  63
_journal_year                    2007
_chemical_formula_iupac          'C14 H10 I2 N2'
_chemical_formula_moiety         'C14 H10 I2 N2'
_chemical_formula_sum            'C14 H10 I2 N2'
_chemical_formula_weight         460.04
_chemical_name_systematic
;
4-iodobenzaldehyde azine
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXTL
_cell_angle_alpha                90.00
_cell_angle_beta                 92.407(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   11.854(2)
_cell_length_b                   7.7308(13)
_cell_length_c                   7.6827(13)
_cell_measurement_reflns_used    2671
_cell_measurement_temperature    174(2)
_cell_measurement_theta_max      27.5
_cell_measurement_theta_min      2.6
_cell_volume                     703.4(2)
_computing_cell_refinement       'SAINT (Bruker, 2003)'
_computing_data_collection       'SMART (Bruker, 2003)'
_computing_data_reduction        SAINT
_computing_molecular_graphics    SHELXTL
_computing_publication_material  SHELXTL
_computing_structure_refinement  SHELXTL
_computing_structure_solution    'SHELXTL (Sheldrick, 1997)'
_diffrn_ambient_temperature      174(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type
;
Bruker SMART 1K CCD area-detector diffractometer
;
_diffrn_measurement_method       '\w scans'
_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  0.031
_diffrn_reflns_av_sigmaI/netI    0.023
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            7773
_diffrn_reflns_theta_full        27.49
_diffrn_reflns_theta_max         27.49
_diffrn_reflns_theta_min         1.72
_diffrn_standards_decay_%        'less than 1'
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    4.454
_exptl_absorpt_correction_T_max  0.77
_exptl_absorpt_correction_T_min  0.32
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
(SADABS; Sheldrick, 2003; Blessing, 1995)
;
_exptl_crystal_colour            'pale yellow'
_exptl_crystal_density_diffrn    2.172
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             428
_exptl_crystal_size_max          0.45
_exptl_crystal_size_mid          0.35
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.86
_refine_diff_density_min         -0.55
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.11
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     83
_refine_ls_number_reflns         1602
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.11
_refine_ls_R_factor_all          0.026
_refine_ls_R_factor_gt           0.022
_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^)+(0.027P)^2^+0.31P]
where P=(Fo^2^+2Fc^2^)/3
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.052
_refine_ls_wR_factor_ref         0.054
_reflns_number_gt                1442
_reflns_number_total             1602
_reflns_threshold_expression     '>2\s(I) '
_cod_data_source_file            ga3056.cif
_cod_data_source_block           I,I-A
_cod_original_cell_volume        703.5(2)
_cod_original_sg_symbol_H-M      'P 2(1)/c'
_cod_database_code               2016140
_cod_database_fobs_code          2016140