Stereostructural behaviour of N‒N atropisomers: Two conglomerate crystallisations and a crystallisation-induced deracemisation
Arthur, Richard J.; Coogan, Michael P.; Casadesus, Meritxell; Haigh, Robert; Headspith, D. A.; Francesconi, M. Grazia; Laye, Rebecca H.; CrystEngComm 11 (2009) 610–619; doi:10.1039/b814424a

data_7215540
_publ_section_title
;
 Stereostructural behaviour of N--N atropisomers: Two conglomerate
 crystallisations and a crystallisation-induced deracemisation
;
_journal_coden_ASTM              CRECF4
_journal_issue                   4
_journal_name_full               CrystEngComm
_journal_page_first              610
_journal_page_last               619
_journal_paper_doi               10.1039/b814424a
_journal_volume                  11
_journal_year                    2009
_chemical_formula_moiety         'C28 H18 N4 O2'
_chemical_formula_sum            'C28 H18 N4 O2'
_chemical_formula_weight         442.46
_chemical_name_common            2,2'-Diphenyl-3,3-biquinazoline-4,4-dione
_chemical_name_systematic
;
2,2'-Diphenyl-3,3-biquinazoline-4,4-dione
;
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           'WinGX-Routine XCAD4'
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   15.979(3)
_cell_length_b                   14.653(3)
_cell_length_c                   18.466(4)
_cell_measurement_reflns_used    4483
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      25.3
_cell_measurement_theta_min      2.2
_cell_volume                     4323.6(15)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.986
_diffrn_measured_fraction_theta_max 0.986
_diffrn_measurement_device_type  'Enraf Nonius TurboCAD4'
_diffrn_measurement_method       'non-profiled omega 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  0.0000
_diffrn_reflns_av_sigmaI/netI    0.0649
_diffrn_reflns_limit_h_max       19
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            3899
_diffrn_reflns_theta_full        25.35
_diffrn_reflns_theta_max         25.35
_diffrn_reflns_theta_min         2.18
_diffrn_standards_decay_%        1
_diffrn_standards_interval_time  120
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.088
_exptl_absorpt_correction_T_max  0.9825
_exptl_absorpt_correction_T_min  0.7451
_exptl_absorpt_correction_type   refdelf
_exptl_absorpt_process_details
;
Walker, N. & Stuart, D (1983) Acta. Cryst. A39, 158-166
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.359
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1840
_exptl_crystal_size_max          0.29
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.16
_refine_diff_density_max         0.172
_refine_diff_density_min         -0.201
_refine_diff_density_rms         0.038
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.852
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     307
_refine_ls_number_reflns         3899
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.852
_refine_ls_R_factor_all          0.1221
_refine_ls_R_factor_gt           0.0423
_refine_ls_shift/su_max          0.016
_refine_ls_shift/su_mean         0.002
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1201
_refine_ls_wR_factor_ref         0.1478
_reflns_number_gt                2174
_reflns_number_total             3899
_reflns_threshold_expression     >2sigma(I)
_cod_duplicate_entry             7200393
_cod_data_source_file            b814424a.txt
_cod_data_source_block           C28H18N4O2
_cod_depositor_comments
;
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 

 Updated bibliographic information.

 Antanas Vaitkus,
 2019-09-18

 Marked entry as a duplicate of entry 7200393.

 Antanas Vaitkus,
 2019-09-18
;
_cod_original_sg_symbol_H-M      Pbca
_cod_database_code               7215540