Bis-4-aza[6]helicene: A Bis-helicenic 2,2'-Bipyridine with Chemically Triggered Chiroptical Switching Activity.
Isla, Helena; Saleh, Nidal; Ou-Yang, Jiang-Kun; Dhbaibi, Kais; Jean, Marion; Dziurka, Magdalena; Favereau, Ludovic; Vanthuyne, Nicolas; Toupet, Loïc; Jamoussi, Bassem; Srebro-Hooper, Monika; Crassous, Jeanne; The Journal of organic chemistry 84 (2019) 5383–5393; doi:10.1021/acs.joc.9b00389

data_4034302
_publ_section_title
;
 Bis-4-aza[6]helicene: A Bis-helicenic 2,2'-Bipyridine with Chemically
 Triggered Chiroptical Switching Activity.
;
_journal_issue                   9
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              5383
_journal_page_last               5393
_journal_paper_doi               10.1021/acs.joc.9b00389
_journal_volume                  84
_journal_year                    2019
_chemical_formula_sum            'C25 H14 N'
_chemical_formula_weight         328.37
_space_group_IT_number           56
_space_group_name_Hall           '-P 2ab 2ac'
_space_group_name_H-M_alt        'P c c n'
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_H-M   'P c c n'
_atom_sites_solution_hydrogens   difmap
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   26.4070(10)
_cell_length_b                   16.6742(8)
_cell_length_c                   7.0484(4)
_cell_measurement_reflns_used    14282
_cell_measurement_temperature    140(2)
_cell_measurement_theta_max      27.5
_cell_measurement_theta_min      3.23
_cell_volume                     3103.5(3)
_computing_cell_refinement
'CrysAlis RED, Oxford Diffraction Ltd.,Version 1.171.35.11'
_computing_data_collection
'CrysAlis CCD, Oxford Diffraction Ltd.,Version 1.171.35.11'
_computing_data_reduction
'CrysAlis RED, Oxford Diffraction Ltd.,Version 1.171.35.11'
_computing_molecular_graphics    'MERCURY 2.4.5(CCDC, 2011)'
_computing_publication_material  'WINGX (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR-97_(Altomare & al., 1999)'
_diffrn_ambient_temperature      140(2)
_diffrn_detector_area_resol_mean 16.1852
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'CCD Saphire 3 Xcalibur'
_diffrn_measurement_method       'omega 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  0.1300
_diffrn_reflns_av_sigmaI/netI    0.0856
_diffrn_reflns_limit_h_max       33
_diffrn_reflns_limit_h_min       -33
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_l_max       8
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            23618
_diffrn_reflns_theta_full        26.99
_diffrn_reflns_theta_max         26.99
_diffrn_reflns_theta_min         3.23
_exptl_absorpt_coefficient_mu    0.081
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.406
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             1368
_exptl_crystal_size_max          0.223
_exptl_crystal_size_mid          0.091
_exptl_crystal_size_min          0.052
_refine_diff_density_max         0.220
_refine_diff_density_min         -0.208
_refine_diff_density_rms         0.049
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.987
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     235
_refine_ls_number_reflns         3373
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.987
_refine_ls_R_factor_all          0.1279
_refine_ls_R_factor_gt           0.0560
_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^)+(0.0534P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1074
_refine_ls_wR_factor_ref         0.1375
_reflns_number_gt                1847
_reflns_number_total             3373
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo9b00389_si_002.cif
_cod_data_source_block           nm551
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_symmetry_cell_setting' value 'Orthorhombic' was changed
to 'orthorhombic' in accordance with the
/home/data/users/saulius/crontab/automatic-downloads/current/ACS/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 last updated on
2011-04-26.

Automatic conversion script
Id: cif_fix_values 6909 2019-04-08 15:41:33Z antanas 
;
_cod_original_sg_symbol_H-M      Pccn
_cod_database_code               4034302