Methyl pyrazine-2-carboxylate
Zhang, Chang-Hua; Tan, Xue-Jie; Xing, Dian-Xiang; Acta Crystallographica Section E 65 (2009) o2902–; doi:10.1107/S1600536809043451

data_2223859
_publ_section_title
;
 Methyl pyrazine-2-carboxylate
;
_journal_coeditor_code           IM2150
_journal_issue                   11
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o2902
_journal_paper_doi               10.1107/S1600536809043451
_journal_volume                  65
_journal_year                    2009
_chemical_formula_iupac          'C6 H6 N2 O2'
_chemical_formula_moiety         'C6 H6 N2 O2'
_chemical_formula_sum            'C6 H6 N2 O2'
_chemical_formula_weight         138.13
_chemical_name_systematic
;
Methyl pyrazine-2-carboxylate
;
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   3.865(2)
_cell_length_b                   6.690(4)
_cell_length_c                   24.92(2)
_cell_measurement_reflns_used    378
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      25.49
_cell_measurement_theta_min      1.63
_cell_volume                     644.4(7)
_computing_cell_refinement       'SAINT (Bruker, 2000)'
_computing_data_collection       'SMART (Bruker, 2000)'
_computing_data_reduction        'SAINT (Bruker, 2000)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 2008)'
_computing_publication_material
'SHELXL97 (Sheldrick, 2008) and PLATON (Spek, 2009)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXTL (Sheldrick, 2008)'
_diffrn_ambient_temperature      298(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Bruker SMART CCD area-detector'
_diffrn_measurement_method       '\p 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  0.0796
_diffrn_reflns_av_sigmaI/netI    0.0654
_diffrn_reflns_limit_h_max       4
_diffrn_reflns_limit_h_min       -4
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -30
_diffrn_reflns_number            3378
_diffrn_reflns_theta_full        25.49
_diffrn_reflns_theta_max         25.49
_diffrn_reflns_theta_min         1.63
_diffrn_standards_decay_%        0
_exptl_absorpt_coefficient_mu    0.110
_exptl_absorpt_correction_T_max  0.994
_exptl_absorpt_correction_T_min  0.980
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Bruker, 2000)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.424
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             288
_exptl_crystal_size_max          0.32
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.177
_refine_diff_density_min         -0.168
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.051
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     91
_refine_ls_number_reflns         757
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.051
_refine_ls_R_factor_all          0.1059
_refine_ls_R_factor_gt           0.0661
_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^)+(0.0698P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1362
_refine_ls_wR_factor_ref         0.1527
_reflns_number_gt                505
_reflns_number_total             757
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            im2150.cif
_cod_data_source_block           I
_cod_database_code               2223859
_cod_database_fobs_code          2223859