#------------------------------------------------------------------------------ #$Date: 2012-02-03 17:16:24 +0000 (Fri, 03 Feb 2012) $ #$Revision: 32112 $ #$URL: svn://www.crystallography.net/cod/cif/2/00/72/2007254.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_2007254 loop_ _publ_author_name 'Yao, Yingming ' 'Shen, Qi' 'Sun, Jie' 'Xue, Feng' _publ_section_title Bis(2,6-di-tert-butyl-4-methylphenolato-O)(\h^5^-methylcyclopentadienyl)(tetrahydrofuran-O)ytterbium _journal_issue 5 _journal_name_full 'Acta Crystallographica Section C' _journal_page_first 625 _journal_page_last 627 _journal_volume 54 _journal_year 1998 _chemical_formula_moiety 'C40 H61 O3 Yb1' _chemical_formula_sum 'C40 H61 O3 Yb' _chemical_formula_weight 762.96 _chemical_name_systematic ; mono methylcyclopentadienyl bis(2,6-ditertbutyl-4-methylphenoxo) ytterbium tetrafuranate ; _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' _cell_angle_alpha 90 _cell_angle_beta 100.51(3) _cell_angle_gamma 90 _cell_formula_units_Z 4 _cell_length_a 12.206(5) _cell_length_b 15.259(3) _cell_length_c 20.718(8) _cell_measurement_reflns_used 23 _cell_measurement_temperature 293 _cell_measurement_theta_max 13.2 _cell_measurement_theta_min 11.9 _cell_volume 3794(2) _diffrn_ambient_temperature 293 _diffrn_measurement_device 'Rigaku AFC-7R diffractometer' _diffrn_measurement_method \w-2\q _diffrn_radiation_monochromator graphite _diffrn_radiation_source 'X-ray tube' _diffrn_radiation_type 'Mo K\a' _diffrn_radiation_wavelength 0.71069 _diffrn_reflns_av_R_equivalents 0.0784 _diffrn_reflns_limit_h_max 11 _diffrn_reflns_limit_h_min 0 _diffrn_reflns_limit_k_max 12 _diffrn_reflns_limit_k_min 0 _diffrn_reflns_limit_l_max 15 _diffrn_reflns_limit_l_min -22 _diffrn_reflns_number 4951 _diffrn_reflns_theta_max 22.51 _diffrn_standards_decay_% 0.34 _diffrn_standards_interval_count 200 _diffrn_standards_number 3 _exptl_absorpt_coefficient_mu 2.498 _exptl_absorpt_correction_T_max 0.607 _exptl_absorpt_correction_T_min 0.484 _exptl_absorpt_correction_type refdelf _exptl_crystal_colour red _exptl_crystal_density_diffrn 1.336 _exptl_crystal_description prismatic _exptl_crystal_F_000 1580 _exptl_crystal_size_max 0.45 _exptl_crystal_size_mid 0.20 _exptl_crystal_size_min 0.20 _refine_diff_density_max 0.64 _refine_diff_density_min -0.60 _refine_ls_extinction_coef 0.665 _refine_ls_extinction_method 'Zachariasen (1967)' _refine_ls_goodness_of_fit_obs 1.34 _refine_ls_hydrogen_treatment noref _refine_ls_matrix_type full _refine_ls_number_parameters 398 _refine_ls_number_reflns 3666 _refine_ls_number_restraints 0 _refine_ls_R_factor_obs .029 _refine_ls_shift/esd_max 0.011 _refine_ls_structure_factor_coef F _refine_ls_weighting_scheme w=1/\s^2^(Fo)=4Fo^2^/\s^2^(Fo^2^) _refine_ls_wR_factor_obs .039 _reflns_number_observed 3666 _reflns_number_total 4671 _reflns_observed_criterion '[F>2\s(F)]' _[local]_cod_data_source_file na1292.cif _[local]_cod_data_source_block na1292 _[local]_cod_cif_authors_sg_H-M 'P 21/c' _[local]_cod_chemical_formula_sum_orig 'C40 H61 O3 Yb1' _cod_depositor_comments ; The following automatic conversions were performed: '_atom_site_thermal_displace_type' tag value 'Uij' was replaced with 'Uani' value 105 times. Automatic conversion script Id: cif_fix_values 1646 2011-03-28 12:23:43Z adriana ; _cod_database_code 2007254 loop_ _symmetry_equiv_pos_as_xyz +x,+y,+z -x,1/2+y,1/2-z -x,-y,-z +x,1/2-y,1/2+z 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 _atom_site_aniso_type_symbol Yb .0233(2) .0374(2) .0298(2) .00100(10) .00730(10) -.00390(10) Yb O1 .034(3) .047(2) .032(2) .001(2) .004(2) -.010(2) O O2 .025(3) .032(2) .033(2) .001(2) .002(2) -.002(2) O O3 .043(3) .040(2) .045(2) .000(2) .013(2) .000(2) O C1 .018(4) .053(4) .036(4) -.003(3) .007(3) -.010(3) C C2 .025(4) .055(4) .033(3) -.003(3) .007(3) -.004(3) C C3 .052(5) .044(4) .047(4) -.010(3) .013(3) -.008(3) C C4 .047(5) .065(5) .038(4) -.016(4) .011(3) -.019(3) C C5 .025(4) .063(5) .031(3) -.003(3) .003(3) -.012(3) C C6 .023(4) .054(4) .027(3) .000(3) .005(3) -.012(3) C C7 .089(6) .072(5) .044(4) -.015(5) .015(4) -.025(4) C C8 .046(5) .046(4) .038(4) -.006(3) .012(3) .000(3) C C9 .080(9) .41(2) .065(7) -.040(10) .033(6) .070(10) C C10 .66(4) .130(10) .031(6) .20(2) .040(10) .022(6) C C11 .210(10) .180(10) .024(4) -.140(10) .026(6) -.010(5) C C12 .032(4) .056(4) .034(3) .002(3) .005(3) -.001(3) C C13 .049(5) .077(5) .036(4) -.001(4) .008(3) -.004(3) C C14 .054(5) .068(5) .041(4) .016(4) .007(3) .002(3) C C15 .043(5) .057(4) .042(4) .003(4) .009(3) .000(3) C C16 .019(4) .030(3) .035(3) -.002(3) .005(3) .000(3) C C17 .021(4) .032(3) .038(3) -.002(3) .005(3) .00130 C C18 .041(5) .039(4) .056(4) -.004(3) .010(4) .00(3) C C19 .030(4) .042(4) .066(5) -.007(3) -.004(4) .03(3) C C20 .038(5) .042(4) .039(4) .003(3) .000(3) .01(3) C C21 .029(4) .026(3) .043(4) -.001(3) .007(3) .001(3) C C22 .043(5) .082(6) .075(5) .003(4) -.009(4) .006(4) C C23 .028(4) .044(4) .035(3) -.001(3) .010(3) -.008(3) C C24 .053(5) .068(5) .038(4) -.002(4) .014(3) .008(3) C C25 .046(5) .048(4) .051(4) -.005(4) .011(3) -.012(3) C C26 .048(5) .092(6) .052(4) .008(4) .014(4) -.022(4) C C27 .046(4) .040(4) .030(3) .006(3) .006(3) -.002(3) C C28 .076(6) .067(5) .039(4) .020(4) .009(4) -.014(3) C C29 .058(5) .041(4) .043(4) .001(3) .005(3) -.004(3) C C30 .058(5) .045(4) .052(4) -.003(4) .032(4) -.006(3) C C31 .053(5) .054(4) .058(4) -.014(4) .015(4) -.008(4) C C32 .089(7) .063(5) .098(7) -.019(5) .036(6) .016(5) C C33 .120(8) .066(5) .070(6) -.015(5) .050(6) .018(4) C C34 .073(6) .046(4) .055(4) .006(4) .005(4) .007(4) C C35 .047(5) .077(5) .060(5) .014(4) .036(4) .005(4) C C36 .040(5) .093(6) .037(4) .005(4) .015(3) -.028(4) C C37 .048(5) .053(4) .054(5) .011(4) .021(4) -.015(4) C C38 .044(5) .060(5) .051(4) .020(4) .014(4) .002(4) C C39 .017(4) .068(5) .071(5) .004(4) .012(4) -.009(4) C C40 .048(6) .131(8) .096(7) -.016(6) .024(5) -.031(6) C loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv _atom_site_thermal_displace_type _atom_site_calc_flag _atom_site_calc_attached_atom _atom_site_type_symbol Yb .23101(2) .09333(2) .803010(10) .02985(10) Uani ? ? Yb O1 .2864(3) .1859(3) .8724(2) .0380(10) Uani ? ? O O2 .0702(3) .1274(2) .7582(2) .0300(10) Uani ? ? O O3 .1508(3) -.0206(3) .8519(2) .0420(10) Uani ? ? O C1 .3091(5) .2591(4) .9100(3) .035(2) Uani ? ? C C2 .3183(5) .3420(4) .8814(3) .037(2) Uani ? ? C C3 .3338(6) .4148(4) .9235(3) .047(2) Uani ? ? C C4 .3459(6) .4087(5) .9902(3) .049(2) Uani ? ? C C5 .3423(5) .3273(5) 1.0164(3) .040(2) Uani ? ? C C6 .3241(5) .2506(4) .9795(3) .035(2) Uani ? ? C C7 .3625(7) .4900(5) 1.0325(3) .068(3) Uani ? ? C C8 .3168(6) .3611(4) .8077(3) .043(2) Uani ? ? C C9 .4308(9) .3650(10) .7974(5) .183(6) Uani ? ? C C10 .266(2) .4453(9) .7854(5) .276(9) Uani ? ? C C11 .2600(10) .2950(8) .7602(4) .137(5) Uani ? ? C C12 .3194(5) .1609(4) 1.0129(3) .041(2) Uani ? ? C C13 .3422(6) .1684(5) 1.0887(3) .054(2) Uani ? ? C C14 .4068(6) .0988(5) .9955(3) .054(2) Uani ? ? C C15 .2005(6) .1232(4) .9948(3) .047(2) Uani ? ? C C16 -.0333(5) .1506(3) .7282(3) .028(2) Uani ? ? C C17 -.1105(5) .1871(4) .7644(3) .030(2) Uani ? ? C C18 -.2175(6) .2035(4) .7331(3) .045(2) Uani ? ? C C19 -.2542(5) .1899(4) .6660(4) .047(2) Uani ? ? C C20 -.1767(5) .1576(4) .6304(3) .041(2) Uani ? ? C C21 -.0670(5) .1386(4) .6596(3) .033(2) Uani ? ? C C22 -.3734(6) .2057(5) .6327(4) .069(3) Uani ? ? C C23 -.0823(5) .2053(4) .8392(3) .035(2) Uani ? ? C C24 -.0644(6) .1186(5) .8769(3) .053(2) Uani ? ? C C25 .0211(6) .2631(4) .8562(3) .048(2) Uani ? ? C C26 -.1772(6) .2554(5) .8640(3) .063(3) Uani ? ? C C27 .0109(6) .1016(4) .6152(3) .039(2) Uani ? ? C C28 -.0406(7) .1038(5) .5414(3) .061(2) Uani ? ? C C29 .0336(6) .0046(4) .6326(3) .048(2) Uani ? ? C C30 .1186(6) .1541(4) .6213(3) .049(2) Uani ? ? C C31 .0548(6) -.0689(5) .8165(3) .055(2) Uani ? ? C C32 .0105(8) -.1202(5) .8681(5) .081(3) Uani ? ? C C33 .1004(9) -.1166(5) .9285(4) .081(3) Uani ? ? C C34 .1991(7) -.0792(4) .9055(4) .059(2) Uani ? ? C C35 .3904(6) .0789(5) .7342(4) .058(3) Uani ? ? C C36 .3171(6) .0067(6) .7165(3) .056(2) Uani ? ? C C37 .3259(6) -.0488(5) .7688(3) .050(2) Uani ? ? C C38 .4045(6) -.0154(5) .8198(3) .051(2) Uani ? ? C C39 .4464(5) .0625(5) .7987(4) .052(2) Uani ? ? C C40 .5388(7) .1163(7) .8380(5) .091(3) Uani ? ? C H1 .3344 .4729 .9024 .0572 Uani ? ? H H2 .3521 .3225 1.0640 .0450 Uani ? ? H H3 .4330 .4874 1.0634 .0790 Uani ? ? H H4 .3654 .5416 1.0064 .0790 Uani ? ? H H5 .3049 .4970 1.0573 .0790 Uani ? ? H H6 .4730 .4073 .8279 .2257 Uani ? ? H H7 .4687 .3088 .8089 .2257 Uani ? ? H H8 .4385 .3798 .7550 .2257 Uani ? ? H H9 .2849 .4920 .8140 .2306 Uani ? ? H H10 .1774 .4389 .7885 .2306 Uani ? ? H H11 .2603 .4592 .7420 .2306 Uani ? ? H H12 .1839 .2863 .7629 .1423 Uani ? ? H H13 .2656 .3073 .7157 .1423 Uani ? ? H H14 .2960 .2362 .7696 .1423 Uani ? ? H H15 .3376 .1126 1.1089 .0618 Uani ? ? H H16 .4171 .1907 1.1041 .0618 Uani ? ? H H17 .2915 .2075 1.1031 .0618 Uani ? ? H H18 .4797 .1195 1.0105 .0622 Uani ? ? H H19 .4001 .0414 1.0152 .0622 Uani ? ? H H20 .3958 .0897 .9489 .0622 Uani ? ? H H21 .1947 .0666 1.0142 .0562 Uani ? ? H H22 .1788 .1163 .9479 .0562 Uani ? ? H H23 .1472 .1612 1.0091 .0562 Uani ? ? H H24 -.2725 .2261 .7585 .0524 Uani ? ? H H25 -.2010 .1467 .5835 .0468 Uani ? ? H H26 -.4172 .2270 .6633 .0801 Uani ? ? H H27 -.3784 .2455 .5974 .0801 Uani ? ? H H28 -.4074 .1506 .6153 .0801 Uani ? ? H H29 -.1275 .0832 .8663 .0595 Uani ? ? H H30 -.0010 .0889 .8651 .0595 Uani ? ? H H31 -.0480 .1296 .9231 .0595 Uani ? ? H H32 .0834 .2353 .8424 .0538 Uani ? ? H H33 .0402 .2716 .9031 .0538 Uani ? ? H H34 .0086 .3182 .8357 .0538 Uani ? ? H H35 -.1582 .2657 .9106 .0717 Uani ? ? H H36 -.1884 .3115 .8428 .0717 Uani ? ? H H37 -.2444 .2233 .8551 .0717 Uani ? ? H H38 -.0582 .1627 .5274 .0708 Uani ? ? H H39 -.1103 .0710 .5334 .0708 Uani ? ? H H40 .0071 .0789 .5152 .0708 Uani ? ? H H41 -.0347 -.0288 .6248 .0542 Uani ? ? H H42 .0825 -.0211 .6064 .0542 Uani ? ? H H43 .0671 -.0032 .6779 .0542 Uani ? ? H H44 .1675 .1286 .5954 .0581 Uani ? ? H H45 .1577 .1548 .6665 .0581 Uani ? ? H H46 .1032 .2128 .6078 .0606 Uani ? ? H H47 .0768 -.1078 .7844 .0677 Uani ? ? H H48 -.0007 -.0299 .7933 .0677 Uani ? ? H H49 -.0602 -.0952 .8747 .0904 Uani ? ? H H50 -.0081 -.1801 .8524 .0904 Uani ? ? H H51 .1160 -.1749 .9472 .0917 Uani ? ? H H52 .0784 -.0811 .9621 .0917 Uani ? ? H H53 .2459 -.1243 .8909 .0747 Uani ? ? H H54 .2489 -.0478 .9405 .0606 Uani ? ? H H55 .4089 .1197 .7026 .0761 Uani ? ? H H56 .2767 -.0071 .6724 .0603 Uani ? ? H H57 .2936 -.1070 .7672 .0649 Uani ? ? H H58 .4325 -.0467 .8608 .0606 Uani ? ? H H59 .5540 .1671 .8135 .1011 Uani ? ? H H60 .6085 .0846 .8497 .1011 Uani ? ? H H61 .5208 .1377 .8789 .1011 Uani ? ? H loop_ _geom_bond_atom_site_label_1 _geom_bond_atom_site_label_2 _geom_bond_site_symmetry_1 _geom_bond_site_symmetry_2 _geom_bond_distance _geom_bond_publ_flag Yb O(1) . . 2.040(4) yes Yb O(2) . . 2.078(4) yes Yb O(3) . . 2.317(4) yes Yb C(35) . . 2.623(7) yes Yb C(36) . . 2.598(6) yes Yb C(37) . . 2.616(6) yes Yb C(38) . . 2.662(6) yes Yb C(39) . . 2.689(7) yes Yb Cp(centroid) . . 2.355(5) yes O(1) C(1) . . 1.361(7) yes O(2) C(16) . . 1.350(7) yes O(3) C(31) . . 1.464(8) yes O(3) C(34) . . 1.463(8) yes C(1) C(2) . . 1.410(8) no C(1) C(6) . . 1.423(8) no C(2) C(3) . . 1.403(8) no C(2) C(8) . . 1.552(8) no C(3) C(4) . . 1.366(9) no C(4) C(5) . . 1.360(9) no C(4) C(7) . . 1.510(9) no C(5) C(6) . . 1.394(8) no C(6) C(12) . . 1.540(8) no C(8) C(9) . . 1.450(10) no C(8) C(10) . . 1.470(10) no C(8) C(11) . . 1.490(10) no C(12) C(13) . . 1.548(8) no C(12) C(14) . . 1.520(9) no C(12) C(15) . . 1.542(9) no C(16) C(17) . . 1.421(8) no C(16) C(21) . . 1.417(8) no C(17) C(18) . . 1.371(9) no C(17) C(23) . . 1.550(8) no C(18) C(19) . . 1.398(10) no C(19) C(20) . . 1.391(9) no C(19) C(22) . . 1.511(10) no C(20) C(21) . . 1.396(9) no C(21) C(27) . . 1.545(8) no C(23) C(24) . . 1.532(9) no C(23) C(25) . . 1.527(9) no C(23) C(26) . . 1.551(9) no C(27) C(28) . . 1.544(9) no C(27) C(29) . . 1.537(8) no C(27) C(30) . . 1.525(9) no C(31) C(32) . . 1.500(10) no C(32) C(33) . . 1.510(10) no C(33) C(34) . . 1.490(10) no C(35) C(36) . . 1.420(10) no C(35) C(39) . . 1.409(10) no C(36) C(37) . . 1.365(10) no C(37) C(38) . . 1.387(9) no C(38) C(39) . . 1.395(10) no C(39) C(40) . . 1.510(10) no loop_ _atom_type_symbol _atom_type_scat_dispersion_real _atom_type_scat_dispersion_imag _atom_type_scat_source C 0.003 0.002 'International Tables' H 0.000 0.000 'International Tables' O 0.011 0.006 'International Tables' Yb -0.385 5.549 'International Tables' 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 O(1) Yb O(2) 107.80(10) yes O(1) Yb O(3) 108.9(2) yes O(1) Yb C(35) 104.9(2) yes O(1) Yb C(36) 135.6(2) yes O(1) Yb C(37) 131.2(2) yes O(1) Yb C(38) 100.7(2) yes O(1) Yb C(39) 86.8(2) yes O(1) Yb Cp(centroid) 112.9(9) yes O(2) Yb O(3) 86.70(10) yes O(2) Yb C(35) 120.8(2) yes O(2) Yb C(36) 106.7(2) yes O(2) Yb C(37) 121.0(2) yes O(2) Yb C(38) 151.4(2) yes O(2) Yb C(39) 151.5(2) yes O(2) Yb Cp(centroid) 133.6(9) yes O(3) Yb C(35) 126.1(2) yes O(3) Yb C(36) 100.2(2) yes O(3) Yb C(37) 74.9(2) yes O(3) Yb C(38) 82.2(2) yes O(3) Yb C(39) 112.1(2) yes O(3) Yb Cp(centroid) 99.6(5) yes C(35) Yb C(36) 31.6(2) no C(35) Yb C(37) 51.3(2) no C(35) Yb C(38) 50.8(2) no C(35) Yb C(39) 30.7(2) no C(36) Yb C(37) 30.3(2) no C(36) Yb C(38) 50.3(2) no C(36) Yb C(39) 50.7(2) no C(37) Yb C(38) 30.5(2) no C(37) Yb C(39) 50.4(2) no C(38) Yb C(39) 30.2(2) no Yb O(1) C(1) 168.0(4) yes Yb O(2) C(16) 178.8(4) yes Yb O(3) C(31) 121.5(4) yes Yb O(3) C(34) 130.3(4) yes C(31) O(3) C(34) 104.3(5) no O(1) C(1) C(2) 121.3(5) no O(1) C(1) C(6) 118.7(5) no C(2) C(1) C(6) 120.0(5) no C(1) C(2) C(3) 117.5(5) no C(1) C(2) C(8) 126.4(5) no C(3) C(2) C(8) 116.1(5) no C(2) C(3) C(4) 123.5(6) no C(3) C(4) C(5) 117.4(6) no C(3) C(4) C(7) 120.6(6) no C(5) C(4) C(7) 122.0(6) no C(4) C(5) C(6) 124.2(6) no C(1) C(6) C(5) 117.2(6) no C(1) C(6) C(12) 121.8(5) no C(5) C(6) C(12) 121.0(5) no C(2) C(8) C(9) 108.3(6) no C(2) C(8) C(10) 113.7(6) no C(2) C(8) C(11) 116.4(6) no C(9) C(8) C(10) 106.0(10) no C(9) C(8) C(11) 106.0(9) no C(10) C(8) C(11) 105.4(10) no C(6) C(12) C(13) 112.1(5) no C(6) C(12) C(14) 111.2(5) no C(6) C(12) C(15) 109.5(5) no C(13) C(12) C(14) 106.4(5) no C(13) C(12) C(15) 105.1(5) no C(14) C(12) C(15) 112.3(6) no O(2) C(16) C(17) 120.9(5) no O(2) C(16) C(21) 120.3(5) no C(17) C(16) C(21) 118.8(5) no C(16) C(17) C(18) 119.2(5) no C(16) C(17) C(23) 123.4(5) no C(18) C(17) C(23) 117.3(5) no C(17) C(18) C(19) 123.3(6) no C(18) C(19) C(20) 117.0(6) no C(18) C(19) C(22) 122.5(7) no C(20) C(19) C(22) 120.4(7) no C(19) C(20) C(21) 122.4(6) no C(16) C(21) C(20) 119.2(5) no C(16) C(21) C(27) 123.1(5) no C(20) C(21) C(27) 117.7(5) no C(17) C(23) C(24) 109.9(5) no C(17) C(23) C(25) 111.0(5) no C(17) C(23) C(26) 112.1(5) no C(24) C(23) C(25) 110.3(5) no C(24) C(23) C(26) 107.6(5) no C(25) C(23) C(26) 105.9(5) no C(21) C(27) C(28) 113.5(5) no C(21) C(27) C(29) 108.4(5) no C(21) C(27) C(30) 112.0(5) no C(28) C(27) C(29) 106.1(5) no C(28) C(27) C(30) 105.0(5) no C(29) C(27) C(30) 111.8(5) no O(3) C(31) C(32) 105.3(6) no C(31) C(32) C(33) 105.7(7) no C(32) C(33) C(34) 104.9(6) no O(3) C(34) C(33) 103.9(6) no Yb C(35) C(36) 73.2(4) no Yb C(35) C(39) 77.2(4) no C(36) C(35) C(39) 106.3(6) no Yb C(36) C(35) 75.1(4) no Yb C(36) C(37) 75.6(4) no C(35) C(36) C(37) 108.7(6) no Yb C(37) C(36) 74.1(4) no Yb C(37) C(38) 76.6(4) no C(36) C(37) C(38) 108.7(7) no Yb C(38) C(37) 73.0(4) no Yb C(38) C(39) 75.9(4) no C(37) C(38) C(39) 108.5(6) no Yb C(39) C(35) 72.0(4) no Yb C(39) C(38) 73.8(4) no Yb C(39) C(40) 121.8(5) no C(35) C(39) C(38) 107.8(6) no C(35) C(39) C(40) 127.0(8) no C(38) C(39) C(40) 125.2(7) no