[4 + 2] Cycloaddition Reaction To Approach Diazatwistpentacenes: Synthesis, Structures, Physical Properties, and Self-assembly.
Li, Junbo; Li, Peizhou; Wu, Jiansheng; Gao, Junkuo; Xiong, Wei-Wei; Zhang, Guodong; Zhao, Yanli; Zhang, Qichun; The Journal of organic chemistry 79 (2014) 4438–4445; doi:10.1021/jo500400d

data_4029373
_publ_section_title
;
 [4 + 2] Cycloaddition Reaction To Approach Diazatwistpentacenes:
 Synthesis, Structures, Physical Properties, and Self-assembly.
;
_journal_issue                   10
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              4438
_journal_page_last               4445
_journal_paper_doi               10.1021/jo500400d
_journal_volume                  79
_journal_year                    2014
_chemical_formula_moiety         'C48 H28 N4'
_chemical_formula_sum            'C48 H28 N4'
_chemical_formula_weight         660.74
_space_group_IT_number           15
_space_group_name_Hall           '-C 2yc'
_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                 99.470(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   26.9975(6)
_cell_length_b                   14.9487(3)
_cell_length_c                   16.8201(4)
_cell_measurement_reflns_used    5129
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      72.7360
_cell_measurement_theta_min      4.1290
_cell_volume                     6695.7(3)
_computing_cell_refinement       'CrysAlisPro, Agilent Technologies,Version 1.1'
_computing_data_collection       'CrysAlisPro, Agilent Technologies,Version 1.1'
_computing_data_reduction        'CrysAlisPro, Agilent Technologies,Version 1.1'
_computing_molecular_graphics    'DIAMOND. Version 3.0. Crystal Impact'
_computing_publication_material  'Windows Word 2003'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 10.6613
_diffrn_measured_fraction_theta_full 0.975
_diffrn_measured_fraction_theta_max 0.975
_diffrn_measurement_device_type  'SuperNova, Dual, Cu at zero, Atlas'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0198
_diffrn_reflns_av_sigmaI/netI    0.0243
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       -33
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            13252
_diffrn_reflns_theta_full        72.86
_diffrn_reflns_theta_max         72.86
_diffrn_reflns_theta_min         4.14
_exptl_absorpt_coefficient_mu    0.600
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.89174
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'CrysAlisPro, Agilent Technologies'
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.311
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             2752
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.18
_refine_diff_density_max         0.304
_refine_diff_density_min         -0.167
_refine_diff_density_rms         0.035
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.028
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     581
_refine_ls_number_reflns         6513
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.028
_refine_ls_R_factor_all          0.0546
_refine_ls_R_factor_gt           0.0428
_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^)+(0.0693P)^2^+1.5648P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1146
_refine_ls_wR_factor_ref         0.1280
_reflns_number_gt                5222
_reflns_number_total             6513
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo500400d_si_002.cif
_cod_data_source_block           x
_cod_depositor_comments
'Adding full bibliography for 4029372--4029374.cif.'
_cod_original_sg_symbol_H-M      'C 2/c'
_cod_database_code               4029373