Pyrazinacenes: Aza Analogues of Acenes
Gary J. Richards; Jonathan P. Hill; Navaneetha K. Subbaiyan; Francis D'Souza; Paul A. Karr; Mark R. J. Elsegood; Simon J. Teat; Toshiyuki Mori; Katsuhiko Ariga; Journal of Organic Chemistry 74 (2009) 8914–8923; doi:10.1021/jo901832n

data_4025081
_publ_section_title
;
Pyrazinacenes: Aza Analogues of Acenes
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              8914
_journal_page_last               8923
_journal_paper_doi               10.1021/jo901832n
_journal_volume                  74
_journal_year                    2009
_chemical_formula_sum            'C20 H10 N6'
_chemical_formula_weight         334.34
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 92.14(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.0585(18)
_cell_length_b                   6.9906(14)
_cell_length_c                   25.138(5)
_cell_measurement_reflns_used    1488
_cell_measurement_temperature    160(2)
_cell_measurement_theta_max      27.10
_cell_measurement_theta_min      1.62
_cell_volume                     1590.7(5)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker SMART Apex'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL and local programs'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      160(2)
_diffrn_measured_fraction_theta_full 0.922
_diffrn_measured_fraction_theta_max 0.922
_diffrn_measurement_device_type  'Bruker APEX CCD diffractometer'
_diffrn_measurement_method       '\w rotation with narrow frames'
_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  0.0308
_diffrn_reflns_av_sigmaI/netI    0.0309
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       31
_diffrn_reflns_limit_l_min       -31
_diffrn_reflns_number            12388
_diffrn_reflns_theta_full        27.14
_diffrn_reflns_theta_max         27.14
_diffrn_reflns_theta_min         1.62
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.089
_exptl_absorpt_correction_T_max  0.998
_exptl_absorpt_correction_T_min  0.991
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS v2008/1, Sheldrick, G.M., (2008)'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.396
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             688
_exptl_crystal_size_max          0.23
_exptl_crystal_size_mid          0.08
_exptl_crystal_size_min          0.02
_refine_diff_density_max         0.328
_refine_diff_density_min         -0.363
_refine_diff_density_rms         0.140
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.070
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     275
_refine_ls_number_reflns         3247
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.070
_refine_ls_R_factor_all          0.0628
_refine_ls_R_factor_gt           0.0413
_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^)+(0.0740P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1020
_refine_ls_wR_factor_ref         0.1203
_reflns_number_gt                2447
_reflns_number_total             3247
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo901832n_si_002.cif
_cod_data_source_block           ph2tan
_cod_original_sg_symbol_H-M      P2(1)/n
_cod_database_code               4025081