Methyl pyrido[2,3-<i>b</i>]pyrazine-3-carboxylate
Fun, Hoong-Kun; Hemamalini, Madhukar; Hazra, Anita; Goswami, Shyamaprosad; Acta Crystallographica Section E 67 (2011) o3120–; doi:10.1107/S1600536811044412

data_2232500
_publ_section_title
;
 Methyl pyrido[2,3-<i>b</i>]pyrazine-3-carboxylate
;
_journal_coeditor_code           WN2453
_journal_issue                   11
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o3120
_journal_paper_doi               10.1107/S1600536811044412
_journal_volume                  67
_journal_year                    2011
_chemical_formula_iupac          'C9 H7 N3 O2'
_chemical_formula_moiety         'C9 H7 N3 O2'
_chemical_formula_sum            'C9 H7 N3 O2'
_chemical_formula_weight         189.18
_chemical_name_systematic
;
Methyl pyrido[2,3-<i>b</i>]pyrazine-3-carboxylate
;
_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                 107.6860(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   9.51350(10)
_cell_length_b                   26.9042(3)
_cell_length_c                   6.78370(10)
_cell_measurement_reflns_used    6855
_cell_measurement_temperature    100.00(10)
_cell_measurement_theta_max      30.13
_cell_measurement_theta_min      2.25
_cell_volume                     1654.24(4)
_computing_cell_refinement       'SAINT (Bruker, 2009)'
_computing_data_collection       'APEX2 (Bruker, 2009)'
_computing_data_reduction        'SAINT (Bruker, 2009)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 2008)'
_computing_publication_material
'SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009)'
_computing_structure_refinement  'SHELXTL (Sheldrick, 2008)'
_computing_structure_solution    'SHELXTL (Sheldrick, 2008)'
_diffrn_ambient_temperature      100.00(10)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type
;
Bruker SMART APEXII CCD area-detector
;
_diffrn_measurement_method       '\f and \w scans'
_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  0.0252
_diffrn_reflns_av_sigmaI/netI    0.0227
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       37
_diffrn_reflns_limit_k_min       -36
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -8
_diffrn_reflns_number            18421
_diffrn_reflns_theta_full        30.14
_diffrn_reflns_theta_max         30.14
_diffrn_reflns_theta_min         2.25
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.112
_exptl_absorpt_correction_T_max  0.9790
_exptl_absorpt_correction_T_min  0.9752
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Bruker, 2009)'
_exptl_crystal_colour            brown
_exptl_crystal_density_diffrn    1.519
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             784
_exptl_crystal_size_max          0.22
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.19
_refine_diff_density_max         0.377
_refine_diff_density_min         -0.299
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.036
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     255
_refine_ls_number_reflns         4876
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.036
_refine_ls_R_factor_all          0.0495
_refine_ls_R_factor_gt           0.0413
_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^)+(0.0645P)^2^+0.3345P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1084
_refine_ls_wR_factor_ref         0.1148
_reflns_number_gt                4118
_reflns_number_total             4876
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            wn2453.cif
_cod_data_source_block           I
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2232500
_cod_database_fobs_code          2232500