Synthesis and study of differentially substituted dibenzotetraazafulvalenes.
Kamplain, Justin W.; Lynch, Vincent M.; Bielawski, Christopher W.; Organic letters 9 (2007) 5401–5404; doi:10.1021/ol702230r

data_1505613
_publ_section_title
;
 Synthesis and study of differentially substituted
 dibenzotetraazafulvalenes.
;
_journal_issue                   26
_journal_name_full               'Organic letters'
_journal_page_first              5401
_journal_page_last               5404
_journal_paper_doi               10.1021/ol702230r
_journal_volume                  9
_journal_year                    2007
_chemical_formula_moiety         'C20 H18 N4 Br4, C6 H6'
_chemical_formula_sum            'C26 H24 Br4 N4'
_chemical_formula_weight         712.13
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 114.053(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   21.2572(4)
_cell_length_b                   7.5300(2)
_cell_length_c                   17.5917(5)
_cell_measurement_reflns_used    3086
_cell_measurement_temperature    153(2)
_cell_measurement_theta_max      27.5
_cell_measurement_theta_min      1
_cell_volume                     2571.34(12)
_computing_cell_refinement       'Collect software, Nonius B.V. 1998'
_computing_data_collection       'Collect software, Nonius B.V. 1998'
_computing_data_reduction
;
DENZO and Scalepack (Otwinoski and Minor, 1997)
;
_computing_molecular_graphics    'XP SHELXTL/PC, Siemens Analytical'
_computing_structure_refinement  'XL SHELXTL/PC, Siemens Analytical'
_computing_structure_solution
;

SIR97 - Altomare A., Burla M.C., Camalli M., Cascarano G.L., Giacovazzo C., 
Guagliardi A., Moliterni A.G.G., Polidori G.,Spagna R.
;
_diffrn_ambient_temperature      153(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Nonius Kappa CCD'
_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  0.0281
_diffrn_reflns_av_sigmaI/netI    0.0372
_diffrn_reflns_limit_h_max       27
_diffrn_reflns_limit_h_min       -27
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            5019
_diffrn_reflns_theta_full        27.49
_diffrn_reflns_theta_max         27.49
_diffrn_reflns_theta_min         2.54
_exptl_absorpt_coefficient_mu    6.283
_exptl_absorpt_correction_T_max  0.575
_exptl_absorpt_correction_T_min  0.328
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
DENZO and Scalepack (Otwinoski and Minor, 1997)
;
_exptl_crystal_colour            red-orange
_exptl_crystal_density_diffrn    1.840
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plates
_exptl_crystal_F_000             1392
_exptl_crystal_size_max          0.29
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.09
_refine_diff_density_max         0.838
_refine_diff_density_min         -0.991
_refine_diff_density_rms         0.094
_refine_ls_extinction_coef       0.0019(3)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.124
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     191
_refine_ls_number_reflns         2946
_refine_ls_number_restraints     37
_refine_ls_restrained_S_all      1.122
_refine_ls_R_factor_all          0.0725
_refine_ls_R_factor_gt           0.0543
_refine_ls_shift/su_max          0.096
_refine_ls_shift/su_mean         0.009
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0527P)^2^+11.6226P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1320
_refine_ls_wR_factor_ref         0.1431
_reflns_number_gt                2260
_reflns_number_total             2946
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol702230r-file003.cif
_cod_data_source_block           brbridge
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_cell_volume        2571.34(11)
_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               1505613