3-(4-Fluorophenyl)-2-(4-pyridyl)pyrido[2,3-<i>b</i>]pyrazine
Koch, Pierre; Schollmeyer, Dieter; Laufer, Stefan; Acta Crystallographica Section E 65 (2009) o2546–; doi:10.1107/S1600536809037970

data_2223307
_publ_section_title
;
 3-(4-Fluorophenyl)-2-(4-pyridyl)pyrido[2,3-<i>b</i>]pyrazine
;
_journal_coeditor_code           BT5066
_journal_issue                   10
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o2546
_journal_paper_doi               10.1107/S1600536809037970
_journal_volume                  65
_journal_year                    2009
_chemical_formula_iupac          'C18 H11 F N4'
_chemical_formula_moiety         'C18 H11 F N4'
_chemical_formula_sum            'C18 H11 F N4'
_chemical_formula_weight         302.31
_chemical_name_systematic
;
3-(4-Fluorophenyl)-2-(4-pyridyl)pyrido[2,3-<i>b</i>]pyrazine
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/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                 90.994(5)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.7163(9)
_cell_length_b                   13.7937(6)
_cell_length_c                   10.8164(10)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    193(2)
_cell_measurement_theta_max      69
_cell_measurement_theta_min      65
_cell_volume                     1449.4(2)
_computing_cell_refinement       '<i>CAD-4 Software</i> (Enraf--Nonius, 1989)'
_computing_data_collection       '<i>CAD-4 Software</i> (Enraf--Nonius, 1989)'
_computing_data_reduction        'CORINC (Dr\"ager & Gattow, 1971)'
_computing_molecular_graphics    'PLATON (Spek, 2009)'
_computing_publication_material  'PLATON (Spek, 2009)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SIR97 (Altomare <i>et al.</i>,  1999)'
_diffrn_ambient_temperature      193(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device       '\k-geometry diffractometer'
_diffrn_measurement_device_type  'Enraf--Nonius CAD-4'
_diffrn_measurement_method       \w/2\q
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0229
_diffrn_reflns_av_sigmaI/netI    0.0158
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            2906
_diffrn_reflns_theta_full        69.97
_diffrn_reflns_theta_max         69.97
_diffrn_reflns_theta_min         4.55
_diffrn_standards_decay_%        2
_diffrn_standards_interval_time  60
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.777
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.385
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             624
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.22
_refine_diff_density_max         0.313
_refine_diff_density_min         -0.241
_refine_ls_extinction_coef       0.0079(9)
_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   1.202
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     209
_refine_ls_number_reflns         2753
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.202
_refine_ls_R_factor_all          0.0480
_refine_ls_R_factor_gt           0.0469
_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^)+(0.073P)^2^+0.6448P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_obs         0.1479
_refine_ls_wR_factor_ref         0.1487
_reflns_number_gt                2654
_reflns_number_total             2753
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            bt5066.cif
_cod_data_source_block           I
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2223307
_cod_database_fobs_code          2223307