#------------------------------------------------------------------------------
#$Date: 2016-03-21 15:06:22 +0200 (Mon, 21 Mar 2016) $
#$Revision: 178737 $
#$URL: svn://www.crystallography.net/cod/cif/4/08/48/4084889.cif $
#------------------------------------------------------------------------------
#
# This file is available in the Crystallography Open Database (COD),
# http://www.crystallography.net/
#
# All data on this site have been placed in the public domain by the
# contributors.
#
data_4084889
loop_
_publ_author_name
'Hurkes, Natascha'
'Bruhn, Clemens'
'Belaj, Ferdinand'
'Pietschnig, Rudolf'
_publ_section_title
;
 Silanetriols as Powerful Starting Materials for Selective Condensation to
 Bulky POSS Cages.
;
_journal_issue                   24
_journal_name_full               Organometallics
_journal_page_first              7299
_journal_page_last               7306
_journal_paper_doi               10.1021/om5010918
_journal_volume                  33
_journal_year                    2014
_chemical_compound_source        'synthetical product'
_chemical_formula_moiety         'C40 H88 O12 Si8'
_chemical_formula_sum            'C40 H88 O12 Si8'
_chemical_formula_weight         985.81
_chemical_name_systematic
' octakis(1,1-dimethylpropyl)octasilsesquioxane'
_space_group_IT_number           167
_symmetry_cell_setting           trigonal
_symmetry_space_group_name_Hall  '-R 3 2"c'
_symmetry_space_group_name_H-M   'R -3 c :H'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           'manual edited SHELXL-97 .cif file'
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                120.00
_cell_formula_units_Z            6
_cell_length_a                   13.2192(4)
_cell_length_b                   13.2192(4)
_cell_length_c                   53.3347(18)
_cell_measurement_reflns_used    9715
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      31.03
_cell_measurement_theta_min      2.34
_cell_volume                     8071.4(4)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'modified ORTEP (Johnson, 1965)'
_computing_publication_material  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       'φ and ω scans'
_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  0.0238
_diffrn_reflns_av_sigmaI/netI    0.0172
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       54
_diffrn_reflns_limit_l_min       -75
_diffrn_reflns_number            14563
_diffrn_reflns_theta_full        30.00
_diffrn_reflns_theta_max         30.00
_diffrn_reflns_theta_min         2.34
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.252
_exptl_absorpt_correction_T_max  0.7462
_exptl_absorpt_correction_T_min  0.5440
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Bruker SADABS'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.217
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             3216
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.26
_exptl_crystal_size_min          0.25
_refine_diff_density_max         0.744
_refine_diff_density_min         -0.408
_refine_diff_density_rms         0.061
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.064
_refine_ls_hydrogen_treatment    refU
_refine_ls_matrix_type           full
_refine_ls_number_parameters     157
_refine_ls_number_reflns         2623
_refine_ls_number_restraints     125
_refine_ls_restrained_S_all      1.172
_refine_ls_R_factor_all          0.0482
_refine_ls_R_factor_gt           0.0416
_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/[σ²(Fo²)+(0.0725P)²+12.2905P] where P=(Fo²+2Fc²)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1200
_refine_ls_wR_factor_ref         0.1280
_reflns_number_gt                2265
_reflns_number_total             2623
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om5010918_si_002.cif
_cod_data_source_block           4b_NH235B
_cod_depositor_comments
'Adding full bibliography for 4084885--4084891.cif.'
_cod_original_cell_volume        8071.4(5)
_cod_original_sg_symbol_H-M      'R -3 c'
_cod_database_code               4084889
loop_
_symmetry_equiv_pos_as_xyz
'x, y, z'
'-y, x-y, z'
'-x+y, -x, z'
'y, x, -z+1/2'
'x-y, -y, -z+1/2'
'-x, -x+y, -z+1/2'
'x+2/3, y+1/3, z+1/3'
'-y+2/3, x-y+1/3, z+1/3'
'-x+y+2/3, -x+1/3, z+1/3'
'y+2/3, x+1/3, -z+5/6'
'x-y+2/3, -y+1/3, -z+5/6'
'-x+2/3, -x+y+1/3, -z+5/6'
'x+1/3, y+2/3, z+2/3'
'-y+1/3, x-y+2/3, z+2/3'
'-x+y+1/3, -x+2/3, z+2/3'
'y+1/3, x+2/3, -z+7/6'
'x-y+1/3, -y+2/3, -z+7/6'
'-x+1/3, -x+y+2/3, -z+7/6'
'-x, -y, -z'
'y, -x+y, -z'
'x-y, x, -z'
'-y, -x, z-1/2'
'-x+y, y, z-1/2'
'x, x-y, z-1/2'
'-x+2/3, -y+1/3, -z+1/3'
'y+2/3, -x+y+1/3, -z+1/3'
'x-y+2/3, x+1/3, -z+1/3'
'-y+2/3, -x+1/3, z-1/6'
'-x+y+2/3, y+1/3, z-1/6'
'x+2/3, x-y+1/3, z-1/6'
'-x+1/3, -y+2/3, -z+2/3'
'y+1/3, -x+y+2/3, -z+2/3'
'x-y+1/3, x+2/3, -z+2/3'
'-y+1/3, -x+2/3, z+1/6'
'-x+y+1/3, y+2/3, z+1/6'
'x+1/3, x-y+2/3, z+1/6'
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
_atom_site_adp_type
_atom_site_occupancy
_atom_site_symmetry_multiplicity
_atom_site_calc_flag
_atom_site_refinement_flags
_atom_site_disorder_assembly
_atom_site_disorder_group
Si1 Si 0.6667 0.3333 0.282618(15) 0.02474(18) Uani 1 3 d S . .
Si2 Si 0.74593(3) 0.55322(3) 0.316449(8) 0.02359(15) Uani 1 1 d . B .
O1 O 0.71725(11) 0.46502(10) 0.29307(2) 0.0311(3) Uani 1 1 d . . .
O2 O 0.62762(10) 0.51057(10) 0.33262(2) 0.0296(3) Uani 1 1 d . . .
C11 C 0.6667 0.3333 0.24764(6) 0.0405(6) Uani 1 3 d SDU . .
C12 C 0.6153(5) 0.4089(6) 0.23836(15) 0.0608(14) Uani 0.66667 1 d PDU A 1
H121 H 0.5346 0.3751 0.2443 0.078(4) Uiso 0.66667 1 calc PR A 1
H122 H 0.6166 0.4111 0.2200 0.078(4) Uiso 0.66667 1 calc PR A 1
H123 H 0.6621 0.4884 0.2449 0.078(4) Uiso 0.66667 1 calc PR A 1
C13 C 0.6433(8) 0.4278(8) 0.2371(3) 0.0468(18) Uani 0.33333 1 d PDU A 2
H131 H 0.6578 0.4358 0.2188 0.060(9) Uiso 0.33333 1 calc PR A 2
H132 H 0.6966 0.5039 0.2451 0.060(9) Uiso 0.33333 1 calc PR A 2
C14 C 0.5159(7) 0.3934(8) 0.24245(16) 0.0576(18) Uani 0.33333 1 d PDU A 2
H141 H 0.5006 0.4536 0.2358 0.078(4) Uiso 0.33333 1 calc PR A 2
H142 H 0.5022 0.3862 0.2606 0.078(4) Uiso 0.33333 1 calc PR A 2
H143 H 0.4636 0.3185 0.2344 0.078(4) Uiso 0.33333 1 calc PR A 2
C21 C 0.79990(15) 0.70412(14) 0.30437(4) 0.0364(3) Uani 1 1 d DU . .
C22 C 0.6984(2) 0.70702(19) 0.29107(5) 0.0532(6) Uani 1 1 d DU B .
H221 H 0.7252 0.7858 0.2846 0.078(4) Uiso 1 1 calc R . .
H222 H 0.6345 0.6860 0.3030 0.078(4) Uiso 1 1 calc R . .
H223 H 0.6706 0.6511 0.2772 0.078(4) Uiso 1 1 calc R . .
C23 C 0.8303(6) 0.7850(4) 0.32772(10) 0.0549(15) Uani 0.575(4) 1 d PDU B 1
H231 H 0.8953 0.7862 0.3369 0.078(4) Uiso 0.575(4) 1 calc PR B 1
H232 H 0.7620 0.7552 0.3387 0.078(4) Uiso 0.575(4) 1 calc PR B 1
H233 H 0.8530 0.8643 0.3223 0.078(4) Uiso 0.575(4) 1 calc PR B 1
C24 C 0.8647(5) 0.8033(6) 0.32282(13) 0.0436(12) Uani 0.425(4) 1 d PDU B 2
H241 H 0.9327 0.8004 0.3297 0.060(9) Uiso 0.425(4) 1 calc PR B 2
H242 H 0.8936 0.8792 0.3142 0.060(9) Uiso 0.425(4) 1 calc PR B 2
C25 C 0.7827(5) 0.7919(5) 0.34380(12) 0.0565(13) Uani 0.425(4) 1 d PDU B 2
H251 H 0.8240 0.8562 0.3557 0.078(4) Uiso 0.425(4) 1 calc PR B 2
H252 H 0.7553 0.7172 0.3524 0.078(4) Uiso 0.425(4) 1 calc PR B 2
H253 H 0.7156 0.7950 0.3368 0.078(4) Uiso 0.425(4) 1 calc PR B 2
C26 C 0.8979(5) 0.7331(7) 0.28477(12) 0.0391(10) Uani 0.425(4) 1 d PDU B 2
H261 H 0.8677 0.6741 0.2715 0.078(4) Uiso 0.425(4) 1 calc PR B 2
H262 H 0.9642 0.7333 0.2930 0.078(4) Uiso 0.425(4) 1 calc PR B 2
H263 H 0.9234 0.8103 0.2775 0.078(4) Uiso 0.425(4) 1 calc PR B 2
C27 C 0.9231(6) 0.7598(9) 0.2932(2) 0.0503(18) Uani 0.274(6) 1 d PDU B 3
H271 H 0.9332 0.6999 0.2842 0.060(9) Uiso 0.274(6) 1 calc PR B 3
H272 H 0.9819 0.7925 0.3068 0.060(9) Uiso 0.274(6) 1 calc PR B 3
C28 C 0.9413(7) 0.8585(6) 0.27481(14) 0.0426(17) Uani 0.274(6) 1 d PDU B 3
H281 H 1.0213 0.8970 0.2683 0.078(4) Uiso 0.274(6) 1 calc PR B 3
H282 H 0.9279 0.9158 0.2836 0.078(4) Uiso 0.274(6) 1 calc PR B 3
H283 H 0.8860 0.8249 0.2608 0.078(4) Uiso 0.274(6) 1 calc PR B 3
C29 C 0.8785(9) 0.7248(16) 0.28109(14) 0.050(2) Uani 0.301(5) 1 d PDU B 4
H291 H 0.8326 0.6650 0.2683 0.060(9) Uiso 0.301(5) 1 calc PR B 4
H292 H 0.9010 0.8022 0.2739 0.060(9) Uiso 0.301(5) 1 calc PR B 4
C30 C 0.9891(7) 0.7198(9) 0.2869(2) 0.068(3) Uani 0.301(5) 1 d PDU B 4
H301 H 1.0357 0.7361 0.2715 0.078(4) Uiso 0.301(5) 1 calc PR B 4
H302 H 0.9676 0.6419 0.2931 0.078(4) Uiso 0.301(5) 1 calc PR B 4
H303 H 1.0349 0.7784 0.2996 0.078(4) Uiso 0.301(5) 1 calc PR B 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'
O O 0.0106 0.0060 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
Si Si 0.0817 0.0704 '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_site_symmetry_1
_geom_angle_site_symmetry_3
O1 Si1 O1 108.82(5) 2_655 .
O1 Si1 C11 110.12(5) . .
O1 Si2 O2 109.17(7) . 32
O1 Si2 O2 108.78(7) . .
O2 Si2 O2 109.17(5) 32 .
O1 Si2 C21 109.33(8) . .
O2 Si2 C21 110.35(7) 32 .
O2 Si2 C21 110.02(7) . .
Si2 O1 Si1 149.53(9) . .
Si2 O2 Si2 148.96(8) 33_545 .
C13 C11 C13 107.4(6) 2_655 .
C13 C11 C12 118.9(5) 2_655 3_665
C13 C11 C12 98.1(4) . 3_665
C13 C11 C12 98.1(4) 3_665 2_655
C13 C11 C12 118.9(5) . 2_655
C12 C11 C12 110.2(3) 3_665 2_655
C13 C11 C12 118.9(5) 3_665 .
C13 C11 C12 98.1(4) 2_655 .
C12 C11 C12 110.2(3) 3_665 .
C12 C11 C12 110.2(3) 2_655 .
C13 C11 Si1 111.4(6) . .
C12 C11 Si1 108.7(3) . .
C11 C12 H121 109.5 . .
C11 C12 H122 109.5 . .
H121 C12 H122 109.5 . .
C11 C12 H123 109.5 . .
H121 C12 H123 109.5 . .
H122 C12 H123 109.5 . .
C11 C13 C14 109.2(5) . .
C11 C13 H131 109.8 . .
C14 C13 H131 109.8 . .
C11 C13 H132 109.8 . .
C14 C13 H132 109.8 . .
H131 C13 H132 108.3 . .
C13 C14 H141 109.5 . .
C13 C14 H142 109.5 . .
H141 C14 H142 109.5 . .
C13 C14 H143 109.5 . .
H141 C14 H143 109.5 . .
H142 C14 H143 109.5 . .
C24 C21 C27 80.3(6) . .
C24 C21 C22 113.6(4) . .
C27 C21 C22 122.8(4) . .
C24 C21 C29 109.1(7) . .
C22 C21 C29 98.2(4) . .
C24 C21 C26 100.5(4) . .
C22 C21 C26 108.3(3) . .
C27 C21 C23 97.6(6) . .
C22 C21 C23 106.3(3) . .
C29 C21 C23 126.7(7) . .
C26 C21 C23 118.1(4) . .
C24 C21 Si2 116.7(4) . .
C27 C21 Si2 113.2(3) . .
C22 C21 Si2 108.33(12) . .
C29 C21 Si2 109.2(7) . .
C26 C21 Si2 108.8(3) . .
C23 C21 Si2 106.7(3) . .
C21 C22 H221 109.5 . .
C21 C22 H222 109.5 . .
H221 C22 H222 109.5 . .
C21 C22 H223 109.5 . .
H221 C22 H223 109.5 . .
H222 C22 H223 109.5 . .
C21 C23 H231 109.5 . .
C21 C23 H232 109.5 . .
H231 C23 H232 109.5 . .
C21 C23 H233 109.5 . .
H231 C23 H233 109.5 . .
H232 C23 H233 109.5 . .
C25 C24 C21 109.1(4) . .
C25 C24 H241 109.9 . .
C21 C24 H241 109.9 . .
C25 C24 H242 109.9 . .
C21 C24 H242 109.9 . .
H241 C24 H242 108.3 . .
C24 C25 H251 109.5 . .
C24 C25 H252 109.5 . .
H251 C25 H252 109.5 . .
C24 C25 H253 109.5 . .
H251 C25 H253 109.5 . .
H252 C25 H253 109.5 . .
C21 C26 H261 109.5 . .
C21 C26 H262 109.5 . .
H261 C26 H262 109.5 . .
C21 C26 H263 109.5 . .
H261 C26 H263 109.5 . .
H262 C26 H263 109.5 . .
C21 C27 C28 109.3(5) . .
C21 C27 H271 109.8 . .
C28 C27 H271 109.8 . .
C21 C27 H272 109.8 . .
C28 C27 H272 109.8 . .
H271 C27 H272 108.3 . .
C27 C28 H281 109.5 . .
C27 C28 H282 109.5 . .
H281 C28 H282 109.5 . .
C27 C28 H283 109.5 . .
H281 C28 H283 109.5 . .
H282 C28 H283 109.5 . .
C30 C29 C21 113.7(6) . .
C30 C29 H291 108.8 . .
C21 C29 H291 108.8 . .
C30 C29 H292 108.8 . .
C21 C29 H292 108.8 . .
H291 C29 H292 107.7 . .
C29 C30 H301 109.5 . .
C29 C30 H302 109.5 . .
H301 C30 H302 109.5 . .
C29 C30 H303 109.5 . .
H301 C30 H303 109.5 . .
H302 C30 H303 109.5 . .
loop_
_geom_bond_atom_site_label_1
_geom_bond_atom_site_label_2
_geom_bond_distance
_geom_bond_site_symmetry_2
Si1 O1 1.6199(12) .
Si1 C11 1.865(4) .
Si2 O1 1.6175(13) .
Si2 O2 1.6194(12) 32
Si2 O2 1.6203(12) .
Si2 C21 1.8655(17) .
C11 C13 1.535(5) .
C11 C12 1.544(3) .
C12 H121 0.98 .
C12 H122 0.98 .
C12 H123 0.98 .
C13 C14 1.535(5) .
C13 H131 0.99 .
C13 H132 0.99 .
C14 H141 0.98 .
C14 H142 0.98 .
C14 H143 0.98 .
C21 C24 1.516(4) .
C21 C27 1.532(4) .
C21 C22 1.535(2) .
C21 C29 1.553(5) .
C21 C26 1.556(4) .
C21 C23 1.557(4) .
C22 H221 0.98 .
C22 H222 0.98 .
C22 H223 0.98 .
C23 H231 0.98 .
C23 H232 0.98 .
C23 H233 0.98 .
C24 C25 1.512(4) .
C24 H241 0.99 .
C24 H242 0.99 .
C25 H251 0.98 .
C25 H252 0.98 .
C25 H253 0.98 .
C26 H261 0.98 .
C26 H262 0.98 .
C26 H263 0.98 .
C27 C28 1.553(5) .
C27 H271 0.99 .
C27 H272 0.99 .
C28 H281 0.98 .
C28 H282 0.98 .
C28 H283 0.98 .
C29 C30 1.527(5) .
C29 H291 0.99 .
C29 H292 0.99 .
C30 H301 0.98 .
C30 H302 0.98 .
C30 H303 0.98 .
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
_geom_torsion_site_symmetry_1
_geom_torsion_site_symmetry_4
O2 Si2 O1 Si1 64.16(18) 32 .
O2 Si2 O1 Si1 -54.87(18) . .
C21 Si2 O1 Si1 -175.03(16) . .
O1 Si1 O1 Si2 -63.98(16) 3_665 .
O1 Si1 O1 Si2 54.45(17) 2_655 .
C11 Si1 O1 Si2 175.24(15) . .
O1 Si2 O2 Si2 64.90(18) . 33_545
O2 Si2 O2 Si2 -54.14(16) 32 33_545
C21 Si2 O2 Si2 -175.37(16) . 33_545
O1 Si1 C11 C13 -33.2(4) 3_665 3_665
O1 Si1 C11 C13 -153.2(4) 2_655 3_665
O1 Si1 C11 C13 86.8(4) . 3_665
O1 Si1 C11 C13 86.8(4) 3_665 2_655
O1 Si1 C11 C13 -33.2(4) 2_655 2_655
O1 Si1 C11 C13 -153.2(4) . 2_655
O1 Si1 C11 C13 -153.2(4) 3_665 .
O1 Si1 C11 C13 86.8(4) 2_655 .
O1 Si1 C11 C13 -33.2(4) . .
O1 Si1 C11 C12 -46.1(3) 3_665 3_665
O1 Si1 C11 C12 -166.1(3) 2_655 3_665
O1 Si1 C11 C12 73.9(3) . 3_665
O1 Si1 C11 C12 73.9(3) 3_665 2_655
O1 Si1 C11 C12 -46.1(3) 2_655 2_655
O1 Si1 C11 C12 -166.1(3) . 2_655
O1 Si1 C11 C12 -166.1(3) 3_665 .
O1 Si1 C11 C12 73.9(3) 2_655 .
O1 Si1 C11 C12 -46.1(3) . .
C13 C11 C13 C14 168.0(5) 3_665 .
C13 C11 C13 C14 52.6(16) 2_655 .
C12 C11 C13 C14 176.5(10) 3_665 .
C12 C11 C13 C14 57.9(9) 2_655 .
C12 C11 C13 C14 10(3) . .
Si1 C11 C13 C14 -69.7(10) . .
O1 Si2 C21 C24 -162.2(3) . .
O2 Si2 C21 C24 -42.1(3) 32 .
O2 Si2 C21 C24 78.4(3) . .
O1 Si2 C21 C27 -71.6(6) . .
O2 Si2 C21 C27 48.4(6) 32 .
O2 Si2 C21 C27 169.0(6) . .
O1 Si2 C21 C22 68.03(17) . .
O2 Si2 C21 C22 -171.89(15) 32 .
O2 Si2 C21 C22 -51.37(17) . .
O1 Si2 C21 C29 -37.9(4) . .
O2 Si2 C21 C29 82.2(4) 32 .
O2 Si2 C21 C29 -157.3(4) . .
O1 Si2 C21 C26 -49.5(3) . .
O2 Si2 C21 C26 70.6(3) 32 .
O2 Si2 C21 C26 -168.9(3) . .
O1 Si2 C21 C23 -177.8(3) . .
O2 Si2 C21 C23 -57.7(3) 32 .
O2 Si2 C21 C23 62.8(3) . .
C27 C21 C24 C25 -174.3(7) . .
C22 C21 C24 C25 64.0(7) . .
C29 C21 C24 C25 172.5(7) . .
C26 C21 C24 C25 179.5(7) . .
C23 C21 C24 C25 -4.6(16) . .
Si2 C21 C24 C25 -63.2(7) . .
C24 C21 C27 C28 -87.3(9) . .
C22 C21 C27 C28 24.6(11) . .
C29 C21 C27 C28 68.4(14) . .
C26 C21 C27 C28 75.6(12) . .
C23 C21 C27 C28 -90.5(9) . .
Si2 C21 C27 C28 157.7(6) . .
C24 C21 C29 C30 65.1(13) . .
C27 C21 C29 C30 39.7(9) . .
C22 C21 C29 C30 -176.3(11) . .
C26 C21 C29 C30 26(4) . .
C23 C21 C29 C30 66.2(15) . .
Si2 C21 C29 C30 -63.6(13) . .
