Crystal structure of rac-trans-N,N′-bis(3,5-dibromosalicylidene)-1,2-cyclohexanediamine, C20H18Br4N2O2
Jiao, Liang; Tan, Hui; Sun, Jinrong; Zhang, Longduo; Wu, Qiong; Zeitschrift für Kristallographie - New Crystal Structures 235 (2020) 847–848; doi:10.1515/ncrs-2020-0052

data_8105305
_publ_section_title
;
 Crystal structure of
 rac-trans-N,N&#x2032;-bis(3,5-dibromosalicylidene)-1,2-cyclohexanediamine,
 C20H18Br4N2O2
;
_journal_issue                   4
_journal_name_full
'Zeitschrift f\"ur Kristallographie - New Crystal Structures'
_journal_page_first              847
_journal_page_last               848
_journal_paper_doi               10.1515/ncrs-2020-0052
_journal_volume                  235
_journal_year                    2020
_chemical_formula_moiety         'C20 H18 Br4 N2 O2'
_chemical_formula_sum            'C20 H18 Br4 N2 O2'
_chemical_formula_weight         638.00
_chemical_name_systematic
;
rac-<i>trans</i>-<i>N</i>,<i>N</i>'-bis(3,5-bromosalicylidene)-1,2-\
cyclohexanediamine, C~20~H~18~Br~4~N~2~O~2~
;
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-2008
_cell_angle_alpha                90.00
_cell_angle_beta                 90.809(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.1119(6)
_cell_length_b                   17.8211(12)
_cell_length_c                   13.5228(8)
_cell_measurement_reflns_used    4618
_cell_measurement_temperature    273(2)
_cell_measurement_theta_max      26.36
_cell_measurement_theta_min      2.94
_cell_volume                     2195.7(2)
_computing_cell_refinement       'CrysAlisPro 1.171.38.41 (Rigaku OD, 2015)'
_computing_data_collection       'CrysAlisPro 1.171.38.41 (Rigaku OD, 2015)'
_computing_data_reduction        'CrysAlisPro 1.171.38.41 (Rigaku OD, 2015)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'XL (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      273.15
_diffrn_measured_fraction_theta_full 0.967
_diffrn_measured_fraction_theta_max 0.967
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0351
_diffrn_reflns_av_unetI/netI     0.0569
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       22
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            7499
_diffrn_reflns_theta_full        26.40
_diffrn_reflns_theta_max         26.40
_diffrn_reflns_theta_min         2.94
_diffrn_source                   'fine-focus sealed tube'
_exptl_absorpt_coefficient_mu    7.350
_exptl_absorpt_correction_T_max  0.7454
_exptl_absorpt_correction_T_min  0.3986
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2014/5 (Bruker,2014/5) was used for absorption correction.
wR2(int) was 0.0916 before and 0.0443 after correction.
The Ratio of minimum to maximum transmission is 0.5347.
The \l/2 correction factor is 0.00150.
;
_exptl_crystal_colour            'clear yellowish yellow'
_exptl_crystal_colour_lustre     clear
_exptl_crystal_colour_modifier   yellowish
_exptl_crystal_colour_primary    yellow
_exptl_crystal_density_diffrn    1.930
_exptl_crystal_density_meas      .
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1232
_exptl_crystal_size_max          0.18
_exptl_crystal_size_mid          0.16
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.738
_refine_diff_density_min         -0.732
_refine_diff_density_rms         0.127
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.107
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     255
_refine_ls_number_reflns         4348
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.107
_refine_ls_R_factor_all          0.0579
_refine_ls_R_factor_gt           0.0448
_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^)+(0.0186P)^2^+7.7727P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0926
_refine_ls_wR_factor_ref         0.0963
_reflns_number_gt                3643
_reflns_number_total             4348
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            suppl_ncrs-2020-0052_suppl.cif
_cod_data_source_block           Jl
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               8105305
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups
 At 1.5 times of:
  All O(H) groups
2.a Ternary CH refined with riding coordinates:
 C8(H8), C13(H13)
2.b Secondary CH2 refined with riding coordinates:
 C12(H12A,H12B), C9(H9A,H9B), C10(H10A,H10B), C11(H11A,H11B)
2.c Aromatic/amide H refined with riding coordinates:
 C16(H16), C7(H7), C14(H14), C18(H18), C5(H5), C3(H3)
2.d Idealised tetrahedral OH refined as rotating group:
 O2(H2), O1(H1)
;