#------------------------------------------------------------------------------ #$Date: 2013-12-28 13:58:47 +0000 (Sat, 28 Dec 2013) $ #$Revision: 91933 $ #$URL: svn://www.crystallography.net/cod/cif/2/20/44/2204407.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_2204407 loop_ _publ_author_name 'Fu, Ai-Yun' 'Wang, Da-Qi' 'Liu, Ai-Zhen' _publ_section_title ; Bis(ethylenediammonium) tris(pyridine-2,6-dicarboxylato-\k^3^O,O',N)cadmium(II) hexahydrate ; _journal_issue 10 _journal_name_full 'Acta Crystallographica Section E' _journal_page_first m1372 _journal_page_last m1373 _journal_volume 60 _journal_year 2004 _chemical_formula_iupac '(C2 H10 N2)2 [Cd (C7 H3 N O4)3], 6H2 O' _chemical_formula_moiety '2C2 H10 N2 2+, C21 H9 Cd N3 O12 4-, 6H2 O' _chemical_formula_sum 'C25 H41 Cd N7 O18' _chemical_formula_weight 840.05 _chemical_name_systematic ;Bis(ethylenediammonium) tris(pyridine-2,6-dicarboxylato-\k^3^O,O',N)cadmium(II) hexahydrate ; _space_group_IT_number 60 _symmetry_cell_setting orthorhombic _symmetry_space_group_name_Hall '-P 2n 2ab' _symmetry_space_group_name_H-M 'P b c n' _atom_sites_solution_hydrogens 'difmap and 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 16.250(3) _cell_length_b 10.0614(15) _cell_length_c 20.021(3) _cell_measurement_reflns_used 5899 _cell_measurement_temperature 298(2) _cell_measurement_theta_max 26.641 _cell_measurement_theta_min 2.39 _cell_volume 3273.4(9) _computing_cell_refinement SMART _computing_data_collection 'SMART (Bruker,1997)' _computing_data_reduction 'SAINT (Bruker, 1997)' _computing_molecular_graphics 'SHELXTL (Bruker, 1997)' _computing_publication_material SHELXTL _computing_structure_refinement 'SHELXL97 (Sheldrick, 1997)' _computing_structure_solution 'SHELXS97 (Sheldrick, 1990)' _diffrn_ambient_temperature 298(2) _diffrn_measured_fraction_theta_full 0.966 _diffrn_measured_fraction_theta_max 0.966 _diffrn_measurement_device_type 'Bruker SMART 1000 CCD area-detector' _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 0.0331 _diffrn_reflns_av_sigmaI/netI 0.0336 _diffrn_reflns_limit_h_max 20 _diffrn_reflns_limit_h_min -21 _diffrn_reflns_limit_k_max 12 _diffrn_reflns_limit_k_min -13 _diffrn_reflns_limit_l_max 25 _diffrn_reflns_limit_l_min -23 _diffrn_reflns_number 19430 _diffrn_reflns_theta_full 28.27 _diffrn_reflns_theta_max 28.27 _diffrn_reflns_theta_min 2.03 _diffrn_standards_number 0 _exptl_absorpt_coefficient_mu 0.759 _exptl_absorpt_correction_T_max 0.8946 _exptl_absorpt_correction_T_min 0.7510 _exptl_absorpt_correction_type multi-scan _exptl_absorpt_process_details '(SADABS; Sheldrick, 1996)' _exptl_crystal_colour colourless _exptl_crystal_density_diffrn 1.705 _exptl_crystal_density_method 'not measured' _exptl_crystal_description block _exptl_crystal_F_000 1728 _exptl_crystal_size_max 0.40 _exptl_crystal_size_mid 0.30 _exptl_crystal_size_min 0.15 _refine_diff_density_max 0.457 _refine_diff_density_min -0.410 _refine_ls_extinction_method none _refine_ls_goodness_of_fit_ref 0.952 _refine_ls_hydrogen_treatment mixed _refine_ls_matrix_type full _refine_ls_number_parameters 314 _refine_ls_number_reflns 3930 _refine_ls_number_restraints 6 _refine_ls_restrained_S_all 0.953 _refine_ls_R_factor_all 0.0493 _refine_ls_R_factor_gt 0.0277 _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^)+(0.035P)^2^] where P = (Fo^2^+2Fc^2^)/3' _refine_ls_weighting_scheme calc _refine_ls_wR_factor_gt 0.0612 _refine_ls_wR_factor_ref 0.0670 _reflns_number_gt 2680 _reflns_number_total 3930 _reflns_threshold_expression I>2\s(I) _[local]_cod_data_source_file wn6276.cif _[local]_cod_data_source_block I _cod_depositor_comments ; The following automatic conversions were performed: '_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic' according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic' dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29. Automatic conversion script Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius The following automatic conversions were performed: '_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic' according to /home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29. Automatic conversion script Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana ; _cod_database_code 2204407 loop_ _symmetry_equiv_pos_as_xyz 'x, y, z' '-x+1/2, -y+1/2, z+1/2' '-x, y, -z+1/2' 'x+1/2, -y+1/2, -z' '-x, -y, -z' 'x-1/2, y-1/2, -z-1/2' 'x, -y, z-1/2' '-x-1/2, y-1/2, z' loop_ _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_type_symbol Cd1 1.0000 0.62545(2) 0.2500 0.02407(7) Uani d S 1 Cd N1 0.88153(10) 0.74815(16) 0.21056(8) 0.0263(4) Uani d . 1 N N2 1.0000 0.3872(2) 0.2500 0.0227(5) Uani d S 1 N N3 0.16046(14) 0.9064(2) 0.08264(11) 0.0369(5) Uani d . 1 N N4 0.09979(14) 0.6123(2) 0.04394(12) 0.0350(5) Uani d . 1 N O1 1.03209(9) 0.79277(14) 0.15859(8) 0.0352(4) Uani d . 1 O O2 0.97935(10) 0.92180(18) 0.07915(8) 0.0429(4) Uani d . 1 O O3 0.86523(9) 0.55836(14) 0.30265(8) 0.0374(4) Uani d . 1 O O4 0.73626(10) 0.61870(15) 0.32455(9) 0.0477(5) Uani d . 1 O O5 0.96419(10) 0.52147(14) 0.13657(7) 0.0335(4) Uani d . 1 O O6 0.98238(10) 0.33841(16) 0.07528(8) 0.0398(4) Uani d . 1 O O7 0.11138(12) 0.15613(17) 0.02829(9) 0.0446(4) Uani d D 1 O O8 0.17597(11) 0.35586(19) 0.11868(9) 0.0442(4) Uani d D 1 O O9 0.15520(13) 0.60130(18) 0.45670(10) 0.0515(5) Uani d D 1 O C1 0.97305(14) 0.8521(2) 0.13053(11) 0.0288(5) Uani d . 1 C C2 0.88875(13) 0.8380(2) 0.16159(10) 0.0281(5) Uani d . 1 C C3 0.82353(15) 0.9143(2) 0.13942(13) 0.0397(6) Uani d . 1 C C4 0.74713(16) 0.8951(3) 0.16806(13) 0.0463(7) Uani d . 1 C C5 0.73832(15) 0.8001(3) 0.21722(13) 0.0396(6) Uani d . 1 C C6 0.80723(13) 0.7297(2) 0.23776(10) 0.0295(5) Uani d . 1 C C7 0.80186(13) 0.6271(2) 0.29296(11) 0.0303(5) Uani d . 1 C C8 0.97850(12) 0.3997(2) 0.12971(11) 0.0266(5) Uani d . 1 C C9 0.99116(12) 0.3189(2) 0.19282(10) 0.0251(4) Uani d . 1 C C10 0.99175(15) 0.1819(2) 0.19087(12) 0.0399(6) Uani d . 1 C C11 1.0000 0.1132(3) 0.2500 0.0437(9) Uani d S 1 C C12 0.15909(17) 0.8350(2) 0.01798(12) 0.0379(6) Uani d . 1 C C13 0.17388(15) 0.6884(3) 0.02502(14) 0.0375(6) Uani d . 1 C H1 0.8347(14) 0.974(2) 0.1046(13) 0.044(7) Uiso d . 1 H H2 0.7011(14) 0.949(2) 0.1574(12) 0.042(7) Uiso d . 1 H H3 0.6901(15) 0.785(2) 0.2407(11) 0.038(7) Uiso d . 1 H H4 0.9864(12) 0.137(2) 0.1460(13) 0.033(6) Uiso d . 1 H H5 1.0000 0.020(5) 0.2500 0.104(19) Uiso d S 1 H H6 0.2156(18) 0.900(2) 0.0988(13) 0.055(8) Uiso d . 1 H H7 0.1212(17) 0.869(2) 0.1088(14) 0.054(8) Uiso d . 1 H H8 0.1488(16) 0.991(3) 0.0757(13) 0.056(9) Uiso d . 1 H H9 0.1070(14) 0.8535(19) -0.0078(11) 0.028(6) Uiso d . 1 H H10 0.2037(16) 0.868(2) -0.0078(12) 0.038(7) Uiso d . 1 H H11 0.1917(14) 0.654(2) -0.0164(12) 0.032(6) Uiso d . 1 H H12 0.2143(16) 0.671(2) 0.0557(13) 0.050(7) Uiso d . 1 H H13 0.1095(16) 0.527(3) 0.0450(14) 0.059(9) Uiso d . 1 H H14 0.0660(18) 0.626(2) 0.0137(15) 0.056(9) Uiso d . 1 H H15 0.0808(17) 0.633(2) 0.0812(14) 0.050(9) Uiso d . 1 H H16 0.0773(14) 0.126(2) -0.0012(11) 0.063(10) Uiso d D 1 H H17 0.0838(18) 0.207(3) 0.0550(13) 0.095(12) Uiso d D 1 H H18 0.1856(17) 0.2836(19) 0.1417(13) 0.074(11) Uiso d D 1 H H19 0.167(2) 0.415(3) 0.1499(13) 0.097(12) Uiso d D 1 H H20 0.139(2) 0.671(2) 0.4777(14) 0.083(11) Uiso d D 1 H H21 0.1103(11) 0.586(3) 0.4340(12) 0.057(9) Uiso d D 1 H 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 Cd1 0.02507(12) 0.02111(11) 0.02603(11) 0.000 -0.00007(9) 0.000 N1 0.0307(10) 0.0223(9) 0.0261(10) 0.0010(7) 0.0001(7) -0.0028(7) N2 0.0208(11) 0.0239(12) 0.0235(11) 0.000 -0.0003(10) 0.000 N3 0.0320(12) 0.0304(12) 0.0484(14) -0.0046(9) -0.0045(10) -0.0007(10) N4 0.0407(13) 0.0341(12) 0.0304(12) -0.0032(10) -0.0027(10) 0.0004(10) O1 0.0308(8) 0.0366(9) 0.0381(9) 0.0004(7) -0.0003(7) 0.0087(7) O2 0.0440(10) 0.0511(10) 0.0335(10) -0.0070(8) -0.0018(7) 0.0156(8) O3 0.0283(8) 0.0345(9) 0.0494(10) 0.0016(7) 0.0034(7) 0.0124(8) O4 0.0372(10) 0.0495(10) 0.0565(12) 0.0061(8) 0.0171(8) 0.0153(8) O5 0.0424(9) 0.0269(8) 0.0311(9) 0.0019(7) -0.0047(7) 0.0008(7) O6 0.0535(11) 0.0407(9) 0.0253(9) 0.0081(7) -0.0064(7) -0.0063(7) O7 0.0588(13) 0.0344(10) 0.0407(11) -0.0004(9) -0.0073(9) -0.0066(8) O8 0.0397(10) 0.0481(12) 0.0447(11) 0.0034(8) -0.0017(8) -0.0149(10) O9 0.0584(13) 0.0413(11) 0.0547(13) 0.0043(10) -0.0186(10) -0.0066(9) C1 0.0356(12) 0.0229(11) 0.0278(12) -0.0063(9) -0.0031(9) -0.0050(9) C2 0.0324(12) 0.0277(11) 0.0243(11) 0.0015(9) -0.0009(9) -0.0001(9) C3 0.0440(15) 0.0400(14) 0.0350(14) 0.0078(11) 0.0009(11) 0.0089(11) C4 0.0400(15) 0.0586(18) 0.0404(15) 0.0197(12) -0.0035(11) 0.0071(13) C5 0.0321(14) 0.0517(16) 0.0350(14) 0.0070(11) 0.0016(11) 0.0040(13) C6 0.0285(12) 0.0283(11) 0.0317(14) 0.0013(9) -0.0005(9) -0.0012(9) C7 0.0305(12) 0.0278(11) 0.0325(12) -0.0037(10) 0.0004(9) -0.0019(10) C8 0.0231(11) 0.0330(13) 0.0238(11) -0.0019(8) -0.0016(8) 0.0003(9) C9 0.0263(11) 0.0230(10) 0.0260(11) -0.0018(8) -0.0002(8) -0.0014(8) C10 0.0630(18) 0.0263(11) 0.0304(13) -0.0028(11) -0.0046(11) -0.0029(10) C11 0.077(3) 0.0185(15) 0.0361(18) 0.000 0.0011(18) 0.000 C12 0.0343(14) 0.0433(14) 0.0362(14) -0.0066(11) 0.0016(11) 0.0051(11) C13 0.0321(14) 0.0417(14) 0.0386(15) -0.0007(11) 0.0007(11) -0.0059(12) 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' Cd Cd -0.8075 1.2024 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' 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 N2 Cd1 N1 . 3_755 120.68(4) N2 Cd1 N1 . . 120.68(4) N1 Cd1 N1 3_755 . 118.64(8) N2 Cd1 O3 . . 74.48(3) N1 Cd1 O3 3_755 . 133.71(5) N1 Cd1 O3 . . 65.30(5) N2 Cd1 O3 . 3_755 74.48(3) N1 Cd1 O3 3_755 3_755 65.30(5) N1 Cd1 O3 . 3_755 133.71(5) O3 Cd1 O3 . 3_755 148.95(7) N2 Cd1 O1 . 3_755 131.50(3) N1 Cd1 O1 3_755 3_755 65.81(5) N1 Cd1 O1 . 3_755 74.55(5) O3 Cd1 O1 . 3_755 72.43(5) O3 Cd1 O1 3_755 3_755 131.04(5) N2 Cd1 O1 . . 131.50(3) N1 Cd1 O1 3_755 . 74.55(5) N1 Cd1 O1 . . 65.81(5) O3 Cd1 O1 . . 131.04(5) O3 Cd1 O1 3_755 . 72.43(5) O1 Cd1 O1 3_755 . 97.01(7) N2 Cd1 O5 . . 65.95(3) N1 Cd1 O5 3_755 . 132.61(5) N1 Cd1 O5 . . 74.86(5) O3 Cd1 O5 . . 93.66(5) O3 Cd1 O5 3_755 . 73.62(5) O1 Cd1 O5 3_755 . 149.40(5) O1 Cd1 O5 . . 71.30(5) N2 Cd1 O5 . 3_755 65.95(3) N1 Cd1 O5 3_755 3_755 74.86(5) N1 Cd1 O5 . 3_755 132.61(5) O3 Cd1 O5 . 3_755 73.62(5) O3 Cd1 O5 3_755 3_755 93.66(5) O1 Cd1 O5 3_755 3_755 71.30(5) O1 Cd1 O5 . 3_755 149.40(5) O5 Cd1 O5 . 3_755 131.90(6) C6 N1 C2 . . 118.10(18) C6 N1 Cd1 . . 120.98(14) C2 N1 Cd1 . . 120.92(13) C9 N2 C9 3_755 . 118.5(2) C9 N2 Cd1 3_755 . 120.77(12) C9 N2 Cd1 . . 120.77(12) C12 N3 H6 . . 106.0(16) C12 N3 H7 . . 107.0(16) H6 N3 H7 . . 116(2) C12 N3 H8 . . 109.0(18) H6 N3 H8 . . 109(2) H7 N3 H8 . . 110(2) C13 N4 H13 . . 111.6(18) C13 N4 H14 . . 105.2(19) H13 N4 H14 . . 108(2) C13 N4 H15 . . 113.9(18) H13 N4 H15 . . 107(2) H14 N4 H15 . . 112(3) C1 O1 Cd1 . . 118.54(14) C7 O3 Cd1 . . 120.02(13) C8 O5 Cd1 . . 116.93(13) H16 O7 H17 . . 107(3) H18 O8 H19 . . 103(3) H20 O9 H21 . . 98(3) O2 C1 O1 . . 124.7(2) O2 C1 C2 . . 117.8(2) O1 C1 C2 . . 117.5(2) N1 C2 C3 . . 122.9(2) N1 C2 C1 . . 116.37(18) C3 C2 C1 . . 120.7(2) C4 C3 C2 . . 118.6(2) C4 C3 H1 . . 124.8(14) C2 C3 H1 . . 116.6(14) C5 C4 C3 . . 119.1(2) C5 C4 H2 . . 118.4(14) C3 C4 H2 . . 122.3(14) C4 C5 C6 . . 118.8(2) C4 C5 H3 . . 124.2(15) C6 C5 H3 . . 116.7(15) N1 C6 C5 . . 122.5(2) N1 C6 C7 . . 116.33(18) C5 C6 C7 . . 121.2(2) O4 C7 O3 . . 126.0(2) O4 C7 C6 . . 117.84(19) O3 C7 C6 . . 116.15(19) O6 C8 O5 . . 125.8(2) O6 C8 C9 . . 117.00(19) O5 C8 C9 . . 117.21(19) N2 C9 C10 . . 122.3(2) N2 C9 C8 . . 116.79(18) C10 C9 C8 . . 120.9(2) C11 C10 C9 . . 118.5(2) C11 C10 H4 . . 123.3(12) C9 C10 H4 . . 118.1(13) C10 C11 C10 3_755 . 119.8(3) C10 C11 H5 3_755 . 120.09(15) C10 C11 H5 . . 120.09(15) N3 C12 C13 . . 113.1(2) N3 C12 H9 . . 111.7(12) C13 C12 H9 . . 111.4(11) N3 C12 H10 . . 107.1(14) C13 C12 H10 . . 105.7(13) H9 C12 H10 . . 107.3(19) N4 C13 C12 . . 113.8(2) N4 C13 H11 . . 106.5(13) C12 C13 H11 . . 109.3(13) N4 C13 H12 . . 108.3(16) C12 C13 H12 . . 111.4(15) H11 C13 H12 . . 107(2) loop_ _geom_bond_atom_site_label_1 _geom_bond_atom_site_label_2 _geom_bond_site_symmetry_2 _geom_bond_distance Cd1 N2 . 2.397(2) Cd1 N1 3_755 2.4194(17) Cd1 N1 . 2.4194(17) Cd1 O3 . 2.5225(15) Cd1 O3 3_755 2.5225(15) Cd1 O1 3_755 2.5408(15) Cd1 O1 . 2.5408(15) Cd1 O5 . 2.5671(15) Cd1 O5 3_755 2.5671(15) N1 C6 . 1.337(3) N1 C2 . 1.339(3) N2 C9 3_755 1.343(2) N2 C9 . 1.343(2) N3 C12 . 1.481(3) N3 H6 . 0.95(3) N3 H7 . 0.91(3) N3 H8 . 0.88(3) N4 C13 . 1.476(3) N4 H13 . 0.88(3) N4 H14 . 0.83(3) N4 H15 . 0.83(3) O1 C1 . 1.262(3) O2 C1 . 1.249(3) O3 C7 . 1.255(2) O4 C7 . 1.242(3) O5 C8 . 1.255(2) O6 C8 . 1.254(3) O7 H16 . 0.864(10) O7 H17 . 0.867(10) O8 H18 . 0.874(10) O8 H19 . 0.876(10) O9 H20 . 0.861(10) O9 H21 . 0.872(10) C1 C2 . 1.511(3) C2 C3 . 1.382(3) C3 C4 . 1.381(3) C3 H1 . 0.94(2) C4 C5 . 1.379(4) C4 H2 . 0.95(2) C5 C6 . 1.387(3) C5 H3 . 0.93(2) C6 C7 . 1.515(3) C8 C9 . 1.516(3) C9 C10 . 1.380(3) C10 C11 . 1.377(3) C10 H4 . 1.01(2) C11 C10 3_755 1.377(3) C11 H5 . 0.94(5) C12 C13 . 1.501(3) C12 H9 . 1.01(2) C12 H10 . 0.95(2) C13 H11 . 0.94(2) C13 H12 . 0.92(3) 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 N3 H6 O8 8_665 0.95(3) 1.86(3) 2.801(3) 168(2) N3 H7 O1 1_455 0.91(3) 1.92(3) 2.823(3) 176(2) N3 H8 O7 1_565 0.88(3) 2.01(3) 2.852(3) 160(2) N4 H13 O9 7_565 0.88(3) 2.31(3) 2.912(3) 126(2) N4 H14 O6 5_665 0.83(3) 1.98(3) 2.779(3) 162(3) N4 H15 O1 1_455 0.83(3) 2.37(3) 3.126(3) 151(2) O7 H16 O2 5_665 0.864(10) 1.875(12) 2.723(3) 167(3) O7 H17 O6 1_455 0.867(10) 2.150(18) 2.940(2) 151(3) O8 H18 O4 6_556 0.874(10) 1.972(13) 2.819(2) 163(3) O8 H19 O3 3_655 0.876(10) 1.804(13) 2.661(2) 165(3) O9 H20 O7 7_566 0.861(10) 2.060(11) 2.919(3) 175(3) O9 H21 O5 3_655 0.872(10) 1.972(13) 2.810(2) 161(3) loop_ _geom_torsion_atom_site_label_1 _geom_torsion_atom_site_label_2 _geom_torsion_atom_site_label_3 _geom_torsion_atom_site_label_4 _geom_torsion N3 C12 C13 N4 81.9(3) _cod_database_fobs_code 2204407 _journal_paper_doi 10.1107/S1600536804021567