#------------------------------------------------------------------------------ #$Date: 2011-09-10 04:16:28 +0100 (Sat, 10 Sep 2011) $ #$Revision: 25271 $ #$URL: svn://www.crystallography.net/cod/cif/2/2008448.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_2008448 loop_ _publ_author_name 'Corden, J. P.' 'Errington, W.' 'Moore, P.' 'Wallbridge, M. G. H.' _publ_section_title ; Dichloro(2,3,6,8,11,12,15,17-octamethyl-5,9,14,18-tetraazadibenzo[a,h]cyclotetradecene-\k^4^N)zirconium(IV) tetrahydrofuran hemisolvate ; _journal_issue 5 _journal_name_full 'Acta Crystallographica Section C' _journal_page_first 706 _journal_page_last 707 _journal_volume 55 _journal_year 1999 _chemical_formula_iupac '[Zr Cl2 (C26 H30 N4)], 0.5C4 H8 O' _chemical_formula_moiety 'C26 H30 Cl2 N4 Zr, 0.5C4 H8 O' _chemical_formula_sum 'C28 H34 Cl2 N4 O0.5 Zr' _chemical_formula_weight 596.71 _chemical_name_systematic ; 5,9,14,18-N-(2,3,6,8,11,12,15,17-octamethyl-5,9,14,18- tetraazadibenzo-[a,h]-tetraazacyclotetradecene)- dichlorozirconium(IV) tetrahydrofuran solvate(1/0.5) ; _space_group_IT_number 2 _symmetry_cell_setting triclinic _symmetry_space_group_name_Hall '-P 1' _symmetry_space_group_name_H-M 'P -1' _audit_creation_method SHELXL-97 _cell_angle_alpha 71.61(5) _cell_angle_beta 88.37(4) _cell_angle_gamma 70.53(4) _cell_formula_units_Z 2 _cell_length_a 8.958(5) _cell_length_b 13.258(7) _cell_length_c 14.769(8) _cell_measurement_reflns_used 250 _cell_measurement_temperature 150(2) _cell_measurement_theta_max 24.88 _cell_measurement_theta_min 1.86 _cell_volume 1563.5(16) _computing_cell_refinement MADNES _computing_data_collection 'MADNES (Pflugrath & Messerschmidt, 1992)' _computing_data_reduction 'SHELXTL-Plus (Sheldrick, 1990)' _computing_molecular_graphics SHELXTL-Plus _computing_publication_material SHELXL97 _computing_structure_refinement 'SHELXL97 (Sheldrick, 1997)' _computing_structure_solution SHELXTL-Plus _diffrn_ambient_temperature 150(2) _diffrn_measured_fraction_theta_full 0.747 _diffrn_measured_fraction_theta_max 0.747 _diffrn_measurement_device_type 'Delft Instruments FAST TV area-detector' _diffrn_measurement_method \w _diffrn_radiation_monochromator graphite _diffrn_radiation_source 'normal-focus sealed tube' _diffrn_radiation_type MoK\a _diffrn_radiation_wavelength 0.71073 _diffrn_reflns_av_R_equivalents 0.070 _diffrn_reflns_av_sigmaI/netI 0.2489 _diffrn_reflns_limit_h_max 10 _diffrn_reflns_limit_h_min -10 _diffrn_reflns_limit_k_max 9 _diffrn_reflns_limit_k_min -15 _diffrn_reflns_limit_l_max 16 _diffrn_reflns_limit_l_min -17 _diffrn_reflns_number 6191 _diffrn_reflns_theta_full 24.88 _diffrn_reflns_theta_max 24.88 _diffrn_reflns_theta_min 1.86 _diffrn_standards_decay_% 0 _exptl_absorpt_coefficient_mu 0.545 _exptl_absorpt_correction_type none _exptl_crystal_colour colourless _exptl_crystal_density_diffrn 1.267 _exptl_crystal_density_method 'not measured' _exptl_crystal_description block _exptl_crystal_F_000 616 _exptl_crystal_size_max 0.18 _exptl_crystal_size_mid 0.14 _exptl_crystal_size_min 0.07 _refine_diff_density_max 0.421 _refine_diff_density_min -0.289 _refine_ls_extinction_method none _refine_ls_goodness_of_fit_ref 0.709 _refine_ls_hydrogen_treatment constr _refine_ls_matrix_type full _refine_ls_number_parameters 346 _refine_ls_number_reflns 4062 _refine_ls_number_restraints 24 _refine_ls_restrained_S_all 0.709 _refine_ls_R_factor_all 0.123 _refine_ls_R_factor_gt 0.051 _refine_ls_shift/su_max 0.003 _refine_ls_shift/su_mean 0.000 _refine_ls_structure_factor_coef Fsqd _refine_ls_weighting_details 'calc w = 1/[\s^2^(Fo^2^)+(0.0304P)^2^] where P = (Fo^2^+2Fc^2^)/3' _refine_ls_weighting_scheme calc _refine_ls_wR_factor_ref 0.117 _reflns_number_gt 1723 _reflns_number_total 4062 _reflns_threshold_expression I>2\s(I) _[local]_cod_data_source_file cf1287.cif _[local]_cod_data_source_block CF1287 _[local]_cod_chemical_formula_sum_orig 'C28 H34 Cl2 N4 O0.50 Zr' _cod_original_cell_volume 1563.5(15) _cod_database_code 2008448 loop_ _symmetry_equiv_pos_as_xyz 'x, y, z' '-x, -y, -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_disorder_assembly _atom_site_disorder_group _atom_site_type_symbol Zr1 0.08607(10) 0.26699(6) 0.35263(6) 0.0431(3) Uani d . 1 . . Zr N1 -0.0412(8) 0.2964(5) 0.4737(4) 0.0425(18) Uani d . 1 . . N N2 -0.1580(8) 0.3464(5) 0.2915(4) 0.0411(17) Uani d . 1 . . N N3 0.0426(7) 0.1548(5) 0.2851(4) 0.0394(17) Uani d . 1 . . N N4 0.1663(7) 0.1076(5) 0.4670(4) 0.0383(17) Uani d . 1 . . N Cl1 0.1100(3) 0.45752(15) 0.31739(15) 0.0591(7) Uani d . 1 . . Cl Cl2 0.3564(2) 0.21420(16) 0.29232(15) 0.0620(7) Uani d . 1 . . Cl C1 -0.2370(9) 0.3538(6) 0.5865(5) 0.059(3) Uani d . 1 . . C H1A -0.1666 0.2896 0.6352 0.089 Uiso calc R 1 . . H H1B -0.3440 0.3540 0.5931 0.089 Uiso calc R 1 . . H H1C -0.2304 0.4220 0.5930 0.089 Uiso calc R 1 . . H C2 -0.1901(10) 0.3472(6) 0.4898(6) 0.042(2) Uani d . 1 . . C C3 -0.3120(9) 0.3924(6) 0.4165(6) 0.045(2) Uani d . 1 . . C H3A -0.4130 0.4270 0.4324 0.054 Uiso calc R 1 . . H C4 -0.3011(10) 0.3919(6) 0.3236(6) 0.046(2) Uani d . 1 . . C C5 -0.4529(9) 0.4352(6) 0.2569(5) 0.065(3) Uani d . 1 . . C H5A -0.4425 0.3874 0.2182 0.097 Uiso calc R 1 . . H H5B -0.4693 0.5112 0.2162 0.097 Uiso calc R 1 . . H H5C -0.5420 0.4341 0.2944 0.097 Uiso calc R 1 . . H C6 -0.1305(9) 0.3401(7) 0.1982(6) 0.046(2) Uani d D 1 . . C C7 -0.1921(9) 0.4314(6) 0.1118(6) 0.053(3) Uani d D 1 . . C H7A -0.2628 0.5001 0.1140 0.064 Uiso calc R 1 . . H C8 -0.1476(10) 0.4187(8) 0.0243(7) 0.060(3) Uani d D 1 . . C C9 -0.2138(11) 0.5165(7) -0.0683(5) 0.103(4) Uani d . 1 . . C H9A -0.2998 0.5752 -0.0553 0.155 Uiso calc R 1 . . H H9B -0.2519 0.4903 -0.1135 0.155 Uiso calc R 1 . . H H9C -0.1315 0.5457 -0.0944 0.155 Uiso calc R 1 . . H C10 -0.0324(11) 0.3143(8) 0.0221(6) 0.060(3) Uani d D 1 . . C C11 0.0261(12) 0.3017(8) -0.0749(5) 0.099(4) Uani d . 1 . . C H11A 0.1092 0.2300 -0.0636 0.148 Uiso calc R 1 . . H H11B 0.0661 0.3614 -0.1069 0.148 Uiso calc R 1 . . H H11C -0.0607 0.3060 -0.1142 0.148 Uiso calc R 1 . . H C12 0.0327(9) 0.2267(6) 0.1068(5) 0.045(2) Uani d D 1 . . C H12A 0.1140 0.1617 0.1055 0.054 Uiso calc R 1 . . H C13 -0.0226(9) 0.2357(7) 0.1922(5) 0.041(2) Uani d D 1 . . C C14 0.0694(9) 0.0444(7) 0.3096(6) 0.046(2) Uani d . 1 . . C C15 0.0150(10) -0.0053(6) 0.2423(5) 0.065(3) Uani d . 1 . . C H15A -0.0770 0.0505 0.2021 0.098 Uiso calc R 1 . . H H15B -0.0112 -0.0701 0.2790 0.098 Uiso calc R 1 . . H H15C 0.0988 -0.0276 0.2031 0.098 Uiso calc R 1 . . H C16 0.1441(9) -0.0300(6) 0.4010(5) 0.042(2) Uani d . 1 . . C H16A 0.1654 -0.1068 0.4121 0.051 Uiso calc R 1 . . H C17 0.1885(9) -0.0007(6) 0.4753(6) 0.038(2) Uani d . 1 . . C C18 0.2627(9) -0.0957(5) 0.5668(5) 0.055(3) Uani d . 1 . . C H18A 0.2369 -0.0685 0.6203 0.082 Uiso calc R 1 . . H H18B 0.3760 -0.1231 0.5649 0.082 Uiso calc R 1 . . H H18C 0.2223 -0.1560 0.5734 0.082 Uiso calc R 1 . . H C19 0.2062(10) 0.1473(6) 0.5392(5) 0.038(2) Uani d D 1 . . C C20 0.3469(9) 0.0992(6) 0.5992(5) 0.044(2) Uani d D 1 . . C H20A 0.4213 0.0318 0.5968 0.052 Uiso calc R 1 . . H C21 0.3780(9) 0.1497(6) 0.6620(5) 0.039(2) Uani d D 1 . . C C22 0.5264(9) 0.0960(7) 0.7272(5) 0.060(3) Uani d . 1 . . C H22A 0.5806 0.0214 0.7243 0.090 Uiso calc R 1 . . H H22B 0.5004 0.0914 0.7916 0.090 Uiso calc R 1 . . H H22C 0.5940 0.1407 0.7077 0.090 Uiso calc R 1 . . H C23 0.2694(11) 0.2533(7) 0.6626(5) 0.044(2) Uani d D 1 . . C C24 0.3034(10) 0.3154(7) 0.7257(6) 0.070(3) Uani d . 1 . . C H24A 0.2115 0.3803 0.7220 0.105 Uiso calc R 1 . . H H24B 0.3919 0.3394 0.7041 0.105 Uiso calc R 1 . . H H24C 0.3281 0.2658 0.7907 0.105 Uiso calc R 1 . . H C25 0.1304(10) 0.3054(7) 0.6019(5) 0.045(2) Uani d D 1 . . C H25A 0.0620 0.3764 0.6005 0.054 Uiso calc R 1 . . H C26 0.0935(9) 0.2509(6) 0.5429(5) 0.038(2) Uani d D 1 . . C O1S 0.282(6) 0.831(3) 0.036(3) 0.17(2) Uiso d PDU 0.25 A 1 O C1S 0.280(4) 0.938(2) 0.020(2) 0.049(9) Uiso d PDU 0.25 A 1 C H1SA 0.3397 0.9442 0.0704 0.059 Uiso calc PR 0.25 A 1 H H1SB 0.1735 0.9925 0.0086 0.059 Uiso calc PR 0.25 A 1 H C2S 0.362(4) 0.944(2) -0.0668(19) 0.062(12) Uiso d PDU 0.25 A 1 C H2SA 0.2926 0.9511 -0.1196 0.074 Uiso calc PR 0.25 A 1 H H2SB 0.4009 1.0066 -0.0845 0.074 Uiso calc PR 0.25 A 1 H C3S 0.490(3) 0.839(2) -0.041(3) 0.069(12) Uiso d PDU 0.25 A 1 C H3SA 0.5701 0.8355 0.0032 0.083 Uiso calc PR 0.25 A 1 H H3SB 0.5387 0.8228 -0.0971 0.083 Uiso calc PR 0.25 A 1 H C4S 0.403(6) 0.762(3) 0.004(3) 0.091(16) Uiso d PDU 0.25 A 1 C H4SA 0.3650 0.7353 -0.0415 0.109 Uiso calc PR 0.25 A 1 H H4SB 0.4678 0.6975 0.0566 0.109 Uiso calc PR 0.25 A 1 H O2S 0.370(3) 0.761(2) 0.0717(19) 0.098(10) Uiso d PDU 0.25 B 2 O C5S 0.482(4) 0.757(3) 0.014(2) 0.084(16) Uiso d PDU 0.25 B 2 C H5S1 0.5256 0.6817 0.0076 0.101 Uiso calc PR 0.25 B 2 H H5S2 0.5673 0.7750 0.0362 0.101 Uiso calc PR 0.25 B 2 H C6S 0.404(4) 0.841(3) -0.0774(17) 0.059(11) Uiso d PDU 0.25 B 2 C H6S1 0.4791 0.8657 -0.1192 0.070 Uiso calc PR 0.25 B 2 H H6S2 0.3421 0.8131 -0.1104 0.070 Uiso calc PR 0.25 B 2 H C7S 0.303(6) 0.930(2) -0.042(3) 0.13(2) Uiso d PDU 0.25 B 2 C H7S1 0.3596 0.9762 -0.0318 0.150 Uiso calc PR 0.25 B 2 H H7S2 0.2085 0.9772 -0.0857 0.150 Uiso calc PR 0.25 B 2 H C8S 0.264(5) 0.862(3) 0.047(3) 0.091(19) Uiso d PDU 0.25 B 2 C H8S1 0.2630 0.8965 0.0959 0.109 Uiso calc PR 0.25 B 2 H H8S2 0.1593 0.8581 0.0385 0.109 Uiso calc PR 0.25 B 2 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 Zr1 0.0381(6) 0.0361(5) 0.0507(5) -0.0098(4) 0.0021(4) -0.0113(4) N1 0.035(5) 0.027(4) 0.056(4) -0.003(3) 0.002(4) -0.009(3) N2 0.046(5) 0.038(4) 0.039(4) -0.014(4) 0.001(4) -0.012(3) N3 0.033(4) 0.031(4) 0.048(4) -0.006(3) 0.003(3) -0.009(3) N4 0.034(4) 0.032(4) 0.047(4) -0.007(3) 0.003(3) -0.015(3) Cl1 0.0642(17) 0.0404(13) 0.0770(15) -0.0201(12) 0.0189(13) -0.0238(11) Cl2 0.0404(15) 0.0515(13) 0.0890(17) -0.0090(11) 0.0149(13) -0.0238(12) C1 0.056(6) 0.063(6) 0.061(6) -0.017(5) 0.017(5) -0.028(5) C2 0.036(6) 0.033(5) 0.053(6) -0.009(4) -0.001(5) -0.013(4) C3 0.031(5) 0.045(5) 0.058(6) -0.009(4) 0.007(5) -0.021(5) C4 0.036(6) 0.027(5) 0.062(6) 0.001(4) 0.001(5) -0.009(4) C5 0.045(6) 0.069(6) 0.072(6) -0.023(5) -0.006(5) -0.007(5) C6 0.040(6) 0.047(5) 0.049(6) -0.019(5) 0.000(4) -0.012(5) C7 0.039(6) 0.052(6) 0.058(6) -0.006(5) -0.013(5) -0.011(5) C8 0.049(6) 0.074(7) 0.050(6) -0.029(6) -0.013(5) 0.001(6) C9 0.125(10) 0.097(8) 0.053(6) -0.039(7) -0.001(6) 0.024(6) C10 0.066(7) 0.073(7) 0.056(6) -0.038(6) 0.008(5) -0.025(6) C11 0.106(9) 0.145(10) 0.041(6) -0.039(7) 0.011(6) -0.028(6) C12 0.054(6) 0.049(5) 0.034(5) -0.018(5) 0.006(5) -0.017(5) C13 0.041(6) 0.048(5) 0.037(5) -0.018(5) -0.007(4) -0.013(5) C14 0.033(6) 0.056(6) 0.047(5) -0.012(5) 0.005(4) -0.018(5) C15 0.083(8) 0.059(6) 0.066(6) -0.031(5) -0.013(5) -0.028(5) C16 0.037(5) 0.035(5) 0.053(5) -0.012(4) -0.006(4) -0.009(4) C17 0.027(5) 0.032(5) 0.054(6) -0.012(4) 0.007(4) -0.010(4) C18 0.064(6) 0.029(5) 0.061(6) -0.017(4) -0.006(5) 0.001(4) C19 0.041(6) 0.033(5) 0.039(5) -0.015(4) 0.006(4) -0.010(4) C20 0.040(6) 0.036(5) 0.044(5) -0.010(4) 0.014(5) -0.002(4) C21 0.034(6) 0.037(5) 0.040(5) -0.007(4) 0.001(4) -0.009(4) C22 0.041(6) 0.084(7) 0.062(6) -0.023(5) -0.009(5) -0.029(5) C23 0.048(6) 0.054(6) 0.044(5) -0.031(5) 0.012(5) -0.020(5) C24 0.066(7) 0.075(7) 0.077(6) -0.029(6) -0.005(5) -0.029(6) C25 0.047(6) 0.045(5) 0.045(5) -0.017(5) 0.006(5) -0.016(4) C26 0.029(5) 0.038(5) 0.042(5) -0.010(4) 0.012(4) -0.007(4) 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' Cl Cl 0.1484 0.1585 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' Zr Zr -2.9673 0.5597 '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_ _geom_angle_atom_site_label_1 _geom_angle_atom_site_label_2 _geom_angle_atom_site_label_3 _geom_angle _geom_angle_publ_flag N4 Zr1 N1 74.2(2) y N4 Zr1 N2 122.3(2) y N1 Zr1 N2 77.6(3) y N4 Zr1 N3 78.5(2) y N1 Zr1 N3 120.1(2) y N2 Zr1 N3 74.0(2) y N4 Zr1 Cl1 136.78(19) y N1 Zr1 Cl1 87.18(16) y N2 Zr1 Cl1 89.68(17) y N3 Zr1 Cl1 142.76(16) y N4 Zr1 Cl2 88.29(17) y N1 Zr1 Cl2 144.20(19) y N2 Zr1 Cl2 137.06(19) y N3 Zr1 Cl2 85.19(16) y Cl1 Zr1 Cl2 84.79(8) y C2 N1 C26 124.8(7) ? C2 N1 Zr1 137.2(6) ? C26 N1 Zr1 97.7(4) ? C4 N2 C6 126.7(7) ? C4 N2 Zr1 135.6(6) ? C6 N2 Zr1 97.7(5) ? C14 N3 C13 124.8(7) ? C14 N3 Zr1 136.0(5) ? C13 N3 Zr1 99.1(4) ? C17 N4 C19 126.5(6) ? C17 N4 Zr1 135.3(5) ? C19 N4 Zr1 98.0(4) ? N1 C2 C3 120.4(8) ? N1 C2 C1 122.8(7) ? C3 C2 C1 116.8(7) ? C4 C3 C2 128.0(8) ? N2 C4 C3 121.0(8) ? N2 C4 C5 119.2(8) ? C3 C4 C5 119.6(7) ? N2 C6 C7 125.1(8) ? N2 C6 C13 116.5(7) ? C7 C6 C13 118.3(8) ? C8 C7 C6 120.5(8) ? C7 C8 C10 119.2(8) ? C7 C8 C9 120.5(9) ? C10 C8 C9 120.2(9) ? C12 C10 C8 120.3(8) ? C12 C10 C11 119.9(9) ? C8 C10 C11 119.7(8) ? C13 C12 C10 120.1(8) ? C12 C13 C6 121.1(7) ? C12 C13 N3 125.4(7) ? C6 C13 N3 112.2(7) ? N3 C14 C16 120.9(8) ? N3 C14 C15 121.1(7) ? C16 C14 C15 118.0(7) ? C17 C16 C14 126.9(7) ? N4 C17 C16 121.9(7) ? N4 C17 C18 121.2(7) ? C16 C17 C18 116.9(7) ? C20 C19 C26 118.8(8) ? C20 C19 N4 126.4(7) ? C26 C19 N4 114.7(7) ? C21 C20 C19 121.4(8) ? C20 C21 C23 119.3(8) ? C20 C21 C22 120.9(8) ? C23 C21 C22 119.8(8) ? C25 C23 C21 120.9(8) ? C25 C23 C24 117.9(8) ? C21 C23 C24 121.1(8) ? C23 C25 C26 119.9(8) ? C25 C26 C19 119.4(8) ? C25 C26 N1 126.1(7) ? C19 C26 N1 113.9(8) ? C1S O1S C4S 118(4) ? O1S C1S C2S 95(3) ? C3S C2S C1S 103.3(18) ? C2S C3S C4S 99.6(18) ? O1S C4S C3S 101(3) ? C5S O2S C8S 111(3) ? O2S C5S C6S 104(2) ? C7S C6S C5S 99.4(19) ? C8S C7S C6S 100.5(19) ? O2S C8S C7S 108(2) ? loop_ _geom_bond_atom_site_label_1 _geom_bond_atom_site_label_2 _geom_bond_distance _geom_bond_publ_flag Zr1 N4 2.154(5) y Zr1 N1 2.163(6) y Zr1 N2 2.164(6) y Zr1 N3 2.168(6) y Zr1 Cl1 2.495(2) y Zr1 Cl2 2.508(3) y N1 C2 1.331(9) ? N1 C26 1.436(9) ? N2 C4 1.364(9) ? N2 C6 1.417(9) ? N3 C14 1.330(9) ? N3 C13 1.441(8) ? N4 C17 1.347(8) ? N4 C19 1.429(9) ? C1 C2 1.497(9) ? C2 C3 1.395(9) ? C3 C4 1.374(9) ? C4 C5 1.533(9) ? C6 C7 1.421(9) ? C6 C13 1.428(10) ? C7 C8 1.385(10) ? C8 C10 1.434(11) ? C8 C9 1.522(9) ? C10 C12 1.388(10) ? C10 C11 1.551(10) ? C12 C13 1.367(9) ? C14 C16 1.420(9) ? C14 C15 1.522(10) ? C16 C17 1.382(9) ? C17 C18 1.508(8) ? C19 C20 1.397(10) ? C19 C26 1.424(10) ? C20 C21 1.385(10) ? C21 C23 1.397(10) ? C21 C22 1.486(9) ? C23 C25 1.389(10) ? C23 C24 1.518(10) ? C25 C26 1.401(10) ? O1S C1S 1.347(16) ? O1S C4S 1.348(16) ? C1S C2S 1.449(16) ? C2S C3S 1.422(19) ? C3S C4S 1.468(16) ? O2S C5S 1.297(16) ? O2S C8S 1.302(16) ? C5S C6S 1.462(16) ? C6S C7S 1.46(2) ? C7S C8S 1.444(16) ?