2,3,5-Triphenylpyrazine
Anuradha, N.; Thiruvalluvar, A.; Pandiarajan, K.; Chitra, S.; Butcher, R. J.; Acta Crystallographica Section E 65 (2009) o106–; doi:10.1107/S1600536808041627

data_2220660
_publ_section_title
;
 2,3,5-Triphenylpyrazine
;
_journal_coeditor_code           WN2297
_journal_issue                   1
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o106
_journal_paper_doi               10.1107/S1600536808041627
_journal_volume                  65
_journal_year                    2009
_chemical_formula_iupac          'C22 H16 N2'
_chemical_formula_moiety         'C22 H16 N2'
_chemical_formula_structural     'C22 H16 N2'
_chemical_formula_sum            'C22 H16 N2'
_chemical_formula_weight         308.37
_chemical_melting_point          421
_chemical_name_common            Triphenylpyrazine
_chemical_name_systematic
;
2,3,5-Triphenylpyrazine
;
_space_group_IT_number           33
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2n'
_symmetry_space_group_name_H-M   'P n a 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   15.563(2)
_cell_length_b                   6.2005(9)
_cell_length_c                   16.845(3)
_cell_measurement_reflns_used    2955
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      21.15
_cell_measurement_theta_min      2.42
_cell_volume                     1625.5(4)
_computing_cell_refinement       'SAINT-NT (Bruker, 2004)'
_computing_data_collection       'APEX2 (Bruker, 2004)'
_computing_data_reduction        'SAINT-NT (Bruker, 2004)'
_computing_molecular_graphics    'ORTEP-3 (Farrugia, 1997)'
_computing_publication_material  'PLATON (Spek, 2003)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'Bruker APEXII CCD'
_diffrn_measurement_method       '\f and \w'
_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  0.0911
_diffrn_reflns_av_sigmaI/netI    0.0569
_diffrn_reflns_limit_h_max       19
_diffrn_reflns_limit_h_min       -19
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            17890
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         26.48
_diffrn_reflns_theta_min         2.42
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.074
_exptl_absorpt_correction_T_max  0.9846
_exptl_absorpt_correction_T_min  0.9680
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Bruker, 2004)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.260
_exptl_crystal_density_method    'Not Measured'
_exptl_crystal_description       chunk
_exptl_crystal_F_000             648
_exptl_crystal_size_max          0.44
_exptl_crystal_size_mid          0.35
_exptl_crystal_size_min          0.21
_refine_diff_density_max         0.134
_refine_diff_density_min         -0.132
_refine_ls_extinction_coef       0.015(3)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL97 (Sheldrick, 2008)'
_refine_ls_goodness_of_fit_ref   1.021
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     218
_refine_ls_number_reflns         1730
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.021
_refine_ls_R_factor_all          0.0920
_refine_ls_R_factor_gt           0.0495
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_max_lt       0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0653P)^2^+0.1081P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1075
_refine_ls_wR_factor_ref         0.1292
_reflns_number_gt                1109
_reflns_number_total             1730
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            wn2297.cif
_cod_data_source_block           I
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic'
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_enum 1527 2010-12-29 10:47:43Z saulius 

The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' 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_database_code               2220660
_cod_database_fobs_code          2220660