#------------------------------------------------------------------------------ #$Date: 2009-12-07 13:52:27 +0200 (Mon, 07 Dec 2009) $ #$Revision: 915 $ #$URL: file:///home/coder/svn-repositories/cod/cif/2/2223859.cif $ #------------------------------------------------------------------------------ # # This file is available in the Crystallography Open Database (COD), # http://www.crystallography.net/. The original data for this entry # were provided by IUCr Journals, http://journals.iucr.org/. # # The file may be used within the scientific community so long as # proper attribution is given to the journal article from which the # data were obtained. # data_2223859 loop_ _publ_author_name 'Zhang, Chang-Hua' 'Tan, Xue-Jie' 'Xing, Dian-Xiang' _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_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) _[local]_cod_data_source_file im2150.cif _[local]_cod_data_source_block I loop_ _symmetry_equiv_pos_as_xyz 'x, y, z' '-x+1/2, -y, z+1/2' '-x, y+1/2, -z+1/2' 'x+1/2, -y+1/2, -z' loop_ _atom_type_symbol _atom_type_description _atom_type_scat_dispersion_real _atom_type_scat_dispersion_imag _atom_type_scat_source C C 0.0033 0.0016 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' H H 0.0000 0.0000 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' N N 0.0061 0.0033 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' O O 0.0106 0.0060 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' loop_ _atom_site_type_symbol _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv _atom_site_adp_type _atom_site_calc_flag _atom_site_refinement_flags _atom_site_occupancy _atom_site_disorder_assembly _atom_site_disorder_group C C1 0.2013(5) 0.6623(3) 0.93604(7) 0.0546(6) Uani d . 1 . . H H1 0.0959 0.7714 0.9524 0.065 Uiso calc R 1 . . C C2 0.2602(4) 0.6690(2) 0.88246(6) 0.0371(5) Uani d . 1 . . C C3 0.5035(6) 0.3674(2) 0.88599(7) 0.0561(6) Uani d . 1 . . H H2 0.6133 0.2594 0.8698 0.067 Uiso calc R 1 . . C C4 0.4367(6) 0.3607(3) 0.93986(7) 0.0604(6) Uani d . 1 . . H H3 0.4999 0.2470 0.9589 0.072 Uiso calc R 1 . . C C5 0.1459(4) 0.8493(2) 0.85163(6) 0.0395(5) Uani d . 1 . . C C6 0.1405(5) 1.0165(2) 0.76991(8) 0.0642(7) Uani d . 1 . . H H4 0.2569 1.0139 0.7359 0.096 Uiso calc R 1 . . H H5 0.1955 1.1385 0.7883 0.096 Uiso calc R 1 . . H H6 -0.1049 1.0089 0.7643 0.096 Uiso calc R 1 . . N N1 0.4157(4) 0.52391(19) 0.85628(6) 0.0479(5) Uani d . 1 . . N N2 0.2869(5) 0.5082(2) 0.96584(6) 0.0665(6) Uani d . 1 . . O O1 0.2516(3) 0.84861(17) 0.80180(4) 0.0514(4) Uani d . 1 . . O O2 -0.0298(4) 0.97530(17) 0.87108(5) 0.0690(5) Uani d . 1 . . loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_12 _atom_site_aniso_U_13 _atom_site_aniso_U_23 C1 0.0681(13) 0.0448(11) 0.0508(10) 0.0017(11) 0.0019(11) 0.0020(10) C2 0.0335(8) 0.0284(8) 0.0494(10) 0.0006(8) 0.0029(9) 0.0011(8) C3 0.0621(12) 0.0330(9) 0.0733(12) 0.0112(11) -0.0098(11) 0.0040(10) C4 0.0677(13) 0.0406(10) 0.0728(12) 0.0014(11) -0.0187(12) 0.0199(10) C5 0.0409(10) 0.0302(8) 0.0475(10) -0.0001(9) 0.0019(9) 0.0023(9) C6 0.0719(15) 0.0541(11) 0.0666(13) 0.0086(12) -0.0045(11) 0.0180(11) N1 0.0535(9) 0.0344(7) 0.0559(9) 0.0089(8) -0.0002(8) -0.0017(8) N2 0.0891(12) 0.0549(10) 0.0554(10) 0.0024(11) -0.0065(10) 0.0083(9) O1 0.0664(8) 0.0412(6) 0.0465(7) 0.0105(7) 0.0004(7) 0.0083(6) O2 0.0935(10) 0.0428(7) 0.0705(9) 0.0264(8) 0.0187(8) -0.0033(7) loop_ _geom_bond_atom_site_label_1 _geom_bond_atom_site_label_2 _geom_bond_site_symmetry_2 _geom_bond_distance _geom_bond_publ_flag C1 N2 . 1.312(2) ? C1 C2 . 1.355(2) ? C1 H1 . 0.9300 ? C2 N1 . 1.315(2) ? C2 C5 . 1.497(2) ? C3 N1 . 1.327(2) ? C3 C4 . 1.368(3) ? C3 H2 . 0.9300 ? C4 N2 . 1.315(3) ? C4 H3 . 0.9300 ? C5 O2 . 1.186(2) ? C5 O1 . 1.307(2) ? C6 O1 . 1.441(2) ? C6 H4 . 0.9600 ? C6 H5 . 0.9600 ? C6 H6 . 0.9600 ? loop_ _geom_angle_atom_site_label_1 _geom_angle_atom_site_label_2 _geom_angle_atom_site_label_3 _geom_angle_site_symmetry_1 _geom_angle_site_symmetry_3 _geom_angle _geom_angle_publ_flag N2 C1 C2 . . 122.76(17) ? N2 C1 H1 . . 118.6 ? C2 C1 H1 . . 118.6 ? N1 C2 C1 . . 122.77(15) ? N1 C2 C5 . . 118.36(15) ? C1 C2 C5 . . 118.87(15) ? N1 C3 C4 . . 121.68(17) ? N1 C3 H2 . . 119.2 ? C4 C3 H2 . . 119.2 ? N2 C4 C3 . . 122.83(17) ? N2 C4 H3 . . 118.6 ? C3 C4 H3 . . 118.6 ? O2 C5 O1 . . 124.72(15) ? O2 C5 C2 . . 122.14(15) ? O1 C5 C2 . . 113.11(14) ? O1 C6 H4 . . 109.5 ? O1 C6 H5 . . 109.5 ? H4 C6 H5 . . 109.5 ? O1 C6 H6 . . 109.5 ? H4 C6 H6 . . 109.5 ? H5 C6 H6 . . 109.5 ? C2 N1 C3 . . 114.99(15) ? C1 N2 C4 . . 114.94(16) ? C5 O1 C6 . . 115.33(14) ? loop_ _geom_hbond_atom_site_label_D _geom_hbond_atom_site_label_H _geom_hbond_atom_site_label_A _geom_hbond_site_symmetry_A _geom_hbond_distance_DH _geom_hbond_distance_HA _geom_hbond_distance_DA _geom_hbond_angle_DHA C3 H2 O2 1_645 0.93 2.35 3.205(3) 152.9 C6 H4 N1 3_656 0.96 2.62 3.582(3) 177.4