5,6-Diphenyl-3-(pyrazin-2-yl)-1,2,4-triazine
Hong Deng; Chunlong Chen; Hao Zhang; Chengyong Su; Liangnian Ji; Acta Crystallographica Section E 58 (2002) o1321–o1322; doi:10.1107/S1600536802019591

data_2201686
_publ_section_title
;
 5,6-Diphenyl-3-(pyrazin-2-yl)-1,2,4-triazine
;
_journal_issue                   11
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o1321
_journal_page_last               o1322
_journal_paper_doi               10.1107/S1600536802019591
_journal_volume                  58
_journal_year                    2002
_chemical_formula_iupac          'C19 H13 N5'
_chemical_formula_moiety         'C19 H13 N5'
_chemical_formula_sum            'C19 H13 N5'
_chemical_formula_weight         311.34
_chemical_name_systematic
;
5,6-Diphenyl-3-(pyrazin-2-yl)-1,2,4-triazine
;
_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           'SHELXL97 (Sheldrick, 1997)'
_cell_angle_alpha                90.00
_cell_angle_beta                 105.149(9)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   14.294(7)
_cell_length_b                   7.027(4)
_cell_length_c                   15.679(8)
_cell_measurement_reflns_used    4369
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      27.14
_cell_measurement_theta_min      1.72
_cell_volume                     1520.1(14)
_computing_cell_refinement       SMART
_computing_data_collection       'SMART (Bruker, 1998)'
_computing_data_reduction        'SAINT (Bruker, 1999)'
_computing_molecular_graphics    'SHELXTL (Bruker, 1998)'
_computing_publication_material  SHELXTL
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.979
_diffrn_measured_fraction_theta_max 0.979
_diffrn_measurement_device_type  'Bruker SMART 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  0.0218
_diffrn_reflns_av_sigmaI/netI    0.0226
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       -18
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            9062
_diffrn_reflns_theta_full        27.14
_diffrn_reflns_theta_max         27.14
_diffrn_reflns_theta_min         1.72
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.085
_exptl_absorpt_correction_T_max  0.9765
_exptl_absorpt_correction_T_min  0.9585
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   '(Blessing, 1995)'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.360
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             648
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.28
_refine_diff_density_max         0.153
_refine_diff_density_min         -0.146
_refine_ls_extinction_coef       0.0224(17)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL97
_refine_ls_goodness_of_fit_ref   1.044
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     218
_refine_ls_number_reflns         3290
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.044
_refine_ls_R_factor_all          0.0578
_refine_ls_R_factor_gt           0.0386
_refine_ls_shift/su_max          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^)+(0.0409P)^2^+0.3681P] where P = (Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0948
_refine_ls_wR_factor_ref         0.1076
_reflns_number_gt                2397
_reflns_number_total             3290
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ww6040.cif
_cod_data_source_block           I
_cod_original_cell_volume        1520.2(13)
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               2201686
_cod_database_fobs_code          2201686