# Supplementary Material (ESI) for Dalton Transactions # This journal is (c) The Royal Society of Chemistry 2010 data_shelxl _database_code_depnum_ccdc_archive 'CCDC 767915' #TrackingRef '- Rankin.cif' _audit_creation_method SHELXL-97 _chemical_name_systematic ; ? ; _chemical_name_common 1,2-bis(tris(trimethylsilyl)methyl)disilane _chemical_melting_point ? _chemical_formula_moiety 'C20 H58 Si8' _chemical_formula_sum 'C20 H58 Si8' _chemical_formula_weight 523.38 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' Si Si 0.0817 0.0704 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' _symmetry_cell_setting triclinic _symmetry_space_group_name_H-M P-1 loop_ _symmetry_equiv_pos_as_xyz 'x, y, z' '-x, -y, -z' _cell_length_a 9.090(4) _cell_length_b 12.712(4) _cell_length_c 15.286(5) _cell_angle_alpha 108.29(3) _cell_angle_beta 90.32(3) _cell_angle_gamma 91.49(3) _cell_volume 1676.4(10) _cell_formula_units_Z 2 _cell_measurement_temperature 203(2) _cell_measurement_reflns_used 25 _cell_measurement_theta_min 2.86 _cell_measurement_theta_max 14.69 _exptl_crystal_description block _exptl_crystal_colour colourless _exptl_crystal_size_max 0.30 _exptl_crystal_size_mid 0.20 _exptl_crystal_size_min 0.20 _exptl_crystal_density_meas ? _exptl_crystal_density_diffrn 1.037 _exptl_crystal_density_method 'not measured' _exptl_crystal_F_000 580 _exptl_absorpt_coefficient_mu 0.328 _exptl_absorpt_correction_type none _exptl_absorpt_correction_T_min ? _exptl_absorpt_correction_T_max ? _exptl_absorpt_process_details ? _exptl_special_details ; ? ; _diffrn_ambient_temperature 203(2) _diffrn_radiation_wavelength 0.71073 _diffrn_radiation_type MoK\a _diffrn_radiation_source 'fine-focus sealed tube' _diffrn_radiation_monochromator graphite _diffrn_measurement_device_type 'Siemens R3m/V' _diffrn_measurement_method 'profile data from \q/2\q scans' _diffrn_detector_area_resol_mean ? _diffrn_standards_number 3 _diffrn_standards_interval_count 100 _diffrn_standards_interval_time ? _diffrn_standards_decay_% 0 _diffrn_reflns_number 6338 _diffrn_reflns_av_R_equivalents 0.0273 _diffrn_reflns_av_sigmaI/netI 0.0489 _diffrn_reflns_limit_h_min -10 _diffrn_reflns_limit_h_max 10 _diffrn_reflns_limit_k_min -15 _diffrn_reflns_limit_k_max 15 _diffrn_reflns_limit_l_min -18 _diffrn_reflns_limit_l_max 18 _diffrn_reflns_theta_min 2.51 _diffrn_reflns_theta_max 25.05 _reflns_number_total 5931 _reflns_number_gt 4510 _reflns_threshold_expression >2sigma(I) _computing_data_collection 'SHELXTL Plus Release 3.4 (Nicolet, 1988)' _computing_cell_refinement 'SHELXTL Plus Release 3.4 (Nicolet, 1988)' _computing_data_reduction 'SHELXTL Plus Release 3.4 (Nicolet, 1988)' _computing_structure_solution 'SHELXTL Plus Release 3.4 (Nicolet, 1988)' _computing_structure_refinement 'SHELXL-97 (Sheldrick, 1997)' _computing_molecular_graphics 'SHELXTL Version 5.03 (Siemens, 1994)' _computing_publication_material SHELXL-97 _refine_special_details ; Refinement of F^2^ against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F^2^, conventional R-factors R are based on F, with F set to zero for negative F^2^. The threshold expression of F^2^ > 2sigma(F^2^) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F^2^ are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. ; _refine_ls_structure_factor_coef Fsqd _refine_ls_matrix_type full _refine_ls_weighting_scheme calc _refine_ls_weighting_details 'calc w=1/[\s^2^(Fo^2^)+(0.0551P)^2^+0.3510P] where P=(Fo^2^+2Fc^2^)/3' _atom_sites_solution_primary direct _atom_sites_solution_secondary difmap _atom_sites_solution_hydrogens geom _refine_ls_hydrogen_treatment mixed _refine_ls_extinction_method none _refine_ls_extinction_coef ? _refine_ls_number_reflns 5931 _refine_ls_number_parameters 287 _refine_ls_number_restraints 0 _refine_ls_R_factor_all 0.0649 _refine_ls_R_factor_gt 0.0455 _refine_ls_wR_factor_ref 0.1121 _refine_ls_wR_factor_gt 0.1044 _refine_ls_goodness_of_fit_ref 1.035 _refine_ls_restrained_S_all 1.035 _refine_ls_shift/su_max 0.000 _refine_ls_shift/su_mean 0.000 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 C1 C 0.4443(3) 0.7034(2) 0.11596(17) 0.0265(6) Uani 1 1 d . . . Si1 Si 0.48250(8) 0.54939(6) 0.07899(5) 0.03050(19) Uani 1 1 d . . . Si2 Si 0.56052(9) 0.77563(6) 0.04733(5) 0.0339(2) Uani 1 1 d . . . C21 C 0.7537(3) 0.7237(3) 0.0295(2) 0.0475(8) Uani 1 1 d . . . H21A H 0.7513 0.6436 0.0145 0.071 Uiso 1 1 calc R . . H21B H 0.8115 0.7565 0.0854 0.071 Uiso 1 1 calc R . . H21C H 0.7979 0.7441 -0.0207 0.071 Uiso 1 1 calc R . . C22 C 0.4827(3) 0.7529(3) -0.0710(2) 0.0460(8) Uani 1 1 d . . . H22A H 0.3858 0.7843 -0.0664 0.069 Uiso 1 1 calc R . . H22B H 0.4751 0.6740 -0.1037 0.069 Uiso 1 1 calc R . . H22C H 0.5469 0.7887 -0.1043 0.069 Uiso 1 1 calc R . . C23 C 0.5805(4) 0.9299(3) 0.1032(2) 0.0566(9) Uani 1 1 d . . . H23A H 0.6363 0.9619 0.0634 0.085 Uiso 1 1 calc R . . H23B H 0.6317 0.9455 0.1619 0.085 Uiso 1 1 calc R . . H23C H 0.4838 0.9617 0.1130 0.085 Uiso 1 1 calc R . . Si3 Si 0.23921(8) 0.71935(6) 0.09883(5) 0.03163(19) Uani 1 1 d . . . C31 C 0.1643(3) 0.6183(2) -0.0105(2) 0.0427(7) Uani 1 1 d . . . H31A H 0.0642 0.6369 -0.0208 0.064 Uiso 1 1 calc R . . H31B H 0.1649 0.5440 -0.0058 0.064 Uiso 1 1 calc R . . H31C H 0.2248 0.6217 -0.0617 0.064 Uiso 1 1 calc R . . C32 C 0.1248(3) 0.6923(3) 0.1911(2) 0.0505(8) Uani 1 1 d . . . H32A H 0.0215 0.6906 0.1745 0.076 Uiso 1 1 calc R . . H32B H 0.1438 0.7506 0.2489 0.076 Uiso 1 1 calc R . . H32C H 0.1499 0.6215 0.1978 0.076 Uiso 1 1 calc R . . C33 C 0.1934(3) 0.8613(2) 0.0967(2) 0.0471(8) Uani 1 1 d . . . H33A H 0.2441 0.8766 0.0461 0.071 Uiso 1 1 calc R . . H33B H 0.2245 0.9157 0.1544 0.071 Uiso 1 1 calc R . . H33C H 0.0880 0.8650 0.0883 0.071 Uiso 1 1 calc R . . Si4 Si 0.49931(9) 0.75460(7) 0.24387(5) 0.0354(2) Uani 1 1 d . . . C41 C 0.4417(4) 0.6559(3) 0.3073(2) 0.0472(8) Uani 1 1 d . . . H41A H 0.4574 0.6911 0.3729 0.071 Uiso 1 1 calc R . . H41B H 0.4997 0.5898 0.2867 0.071 Uiso 1 1 calc R . . H41C H 0.3383 0.6357 0.2949 0.071 Uiso 1 1 calc R . . C42 C 0.4193(4) 0.8914(3) 0.3065(2) 0.0571(9) Uani 1 1 d . . . H42A H 0.3128 0.8839 0.3048 0.086 Uiso 1 1 calc R . . H42B H 0.4497 0.9457 0.2770 0.086 Uiso 1 1 calc R . . H42C H 0.4541 0.9155 0.3700 0.086 Uiso 1 1 calc R . . C43 C 0.7043(4) 0.7719(3) 0.2602(2) 0.0603(10) Uani 1 1 d . . . H43A H 0.7409 0.8257 0.2319 0.090 Uiso 1 1 calc R . . H43B H 0.7496 0.7013 0.2316 0.090 Uiso 1 1 calc R . . H43C H 0.7284 0.7976 0.3256 0.090 Uiso 1 1 calc R . . H1B H 0.362(3) 0.497(2) 0.1106(17) 0.032(7) Uiso 1 1 d . . . H1A H 0.606(3) 0.533(2) 0.1274(17) 0.032(7) Uiso 1 1 d . . . H5B H 0.068(3) 0.393(2) 0.5737(18) 0.037(7) Uiso 1 1 d . . . H5A H -0.170(3) 0.395(2) 0.5222(18) 0.040(8) Uiso 1 1 d . . . C2 C 0.0217(3) 0.2896(2) 0.38937(17) 0.0267(6) Uani 1 1 d . . . Si5 Si -0.01788(9) 0.40647(6) 0.49848(5) 0.0333(2) Uani 1 1 d . . . Si6 Si -0.08694(9) 0.16429(6) 0.40193(6) 0.0374(2) Uani 1 1 d . . . C61 C -0.0198(4) 0.0292(2) 0.3238(2) 0.0485(8) Uani 1 1 d . . . H61A H 0.0825 0.0212 0.3383 0.073 Uiso 1 1 calc R . . H61B H -0.0288 0.0280 0.2602 0.073 Uiso 1 1 calc R . . H61C H -0.0785 -0.0315 0.3325 0.073 Uiso 1 1 calc R . . C62 C -0.0822(4) 0.1558(3) 0.5219(2) 0.0558(9) Uani 1 1 d . . . H62A H -0.1270 0.2207 0.5633 0.084 Uiso 1 1 calc R . . H62B H 0.0191 0.1526 0.5409 0.084 Uiso 1 1 calc R . . H62C H -0.1362 0.0897 0.5235 0.084 Uiso 1 1 calc R . . C63 C -0.2876(4) 0.1680(3) 0.3748(3) 0.0685(11) Uani 1 1 d . . . H63A H -0.3385 0.1041 0.3835 0.103 Uiso 1 1 calc R . . H63B H -0.2999 0.1666 0.3114 0.103 Uiso 1 1 calc R . . H63C H -0.3283 0.2353 0.4156 0.103 Uiso 1 1 calc R . . Si7 Si -0.04395(10) 0.32368(7) 0.28341(6) 0.0390(2) Uani 1 1 d . . . C71 C -0.0665(4) 0.1976(3) 0.1782(2) 0.0545(9) Uani 1 1 d . . . H71A H -0.0931 0.2204 0.1255 0.082 Uiso 1 1 calc R . . H71B H -0.1433 0.1487 0.1887 0.082 Uiso 1 1 calc R . . H71C H 0.0254 0.1588 0.1664 0.082 Uiso 1 1 calc R . . C72 C -0.2266(4) 0.3924(3) 0.3009(2) 0.0583(9) Uani 1 1 d . . . H72A H -0.2374 0.4339 0.3655 0.087 Uiso 1 1 calc R . . H72B H -0.3050 0.3365 0.2817 0.087 Uiso 1 1 calc R . . H72C H -0.2317 0.4425 0.2644 0.087 Uiso 1 1 calc R . . C73 C 0.0876(4) 0.4208(3) 0.2509(2) 0.0582(9) Uani 1 1 d . . . H73A H 0.0504 0.4359 0.1966 0.087 Uiso 1 1 calc R . . H73B H 0.1829 0.3872 0.2379 0.087 Uiso 1 1 calc R . . H73C H 0.0975 0.4896 0.3015 0.087 Uiso 1 1 calc R . . Si8 Si 0.22771(8) 0.26465(6) 0.38698(5) 0.0346(2) Uani 1 1 d . . . C81 C 0.3432(3) 0.3962(3) 0.4231(3) 0.0551(9) Uani 1 1 d . . . H81A H 0.4464 0.3785 0.4149 0.083 Uiso 1 1 calc R . . H81B H 0.3259 0.4360 0.4874 0.083 Uiso 1 1 calc R . . H81C H 0.3170 0.4421 0.3856 0.083 Uiso 1 1 calc R . . C82 C 0.2845(4) 0.1885(3) 0.4682(2) 0.0565(9) Uani 1 1 d . . . H82A H 0.2337 0.1168 0.4514 0.085 Uiso 1 1 calc R . . H82B H 0.2592 0.2311 0.5306 0.085 Uiso 1 1 calc R . . H82C H 0.3899 0.1784 0.4647 0.085 Uiso 1 1 calc R . . C83 C 0.2924(3) 0.1815(3) 0.2704(2) 0.0474(8) Uani 1 1 d . . . H83A H 0.2770 0.2223 0.2272 0.071 Uiso 1 1 calc R . . H83B H 0.2374 0.1114 0.2496 0.071 Uiso 1 1 calc R . . H83C H 0.3964 0.1676 0.2738 0.071 Uiso 1 1 calc R . . loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_23 _atom_site_aniso_U_13 _atom_site_aniso_U_12 C1 0.0251(13) 0.0247(13) 0.0282(14) 0.0059(11) 0.0019(11) 0.0019(11) Si1 0.0312(4) 0.0281(4) 0.0304(4) 0.0063(3) 0.0021(3) 0.0051(3) Si2 0.0311(4) 0.0347(4) 0.0360(4) 0.0114(3) 0.0047(3) -0.0020(3) C21 0.0297(16) 0.057(2) 0.054(2) 0.0158(16) 0.0072(14) -0.0034(14) C22 0.0478(19) 0.056(2) 0.0392(17) 0.0218(15) 0.0079(15) 0.0050(16) C23 0.064(2) 0.0416(19) 0.064(2) 0.0186(17) 0.0086(18) -0.0130(17) Si3 0.0257(4) 0.0319(4) 0.0363(4) 0.0089(3) 0.0037(3) 0.0049(3) C31 0.0293(15) 0.0447(18) 0.0504(19) 0.0093(15) -0.0059(14) 0.0044(13) C32 0.0340(17) 0.066(2) 0.056(2) 0.0245(18) 0.0119(15) 0.0035(16) C33 0.0431(18) 0.0418(18) 0.055(2) 0.0125(15) 0.0056(15) 0.0142(15) Si4 0.0376(5) 0.0360(4) 0.0288(4) 0.0052(3) 0.0003(3) -0.0037(4) C41 0.052(2) 0.055(2) 0.0349(17) 0.0153(15) 0.0007(15) -0.0023(16) C42 0.076(3) 0.0448(19) 0.0397(19) -0.0021(15) 0.0051(17) -0.0028(18) C43 0.048(2) 0.086(3) 0.047(2) 0.0234(19) -0.0151(16) -0.0190(19) C2 0.0277(14) 0.0235(13) 0.0269(14) 0.0052(11) 0.0026(11) 0.0020(11) Si5 0.0396(5) 0.0259(4) 0.0315(4) 0.0047(3) 0.0065(3) 0.0017(3) Si6 0.0363(5) 0.0286(4) 0.0457(5) 0.0095(4) 0.0079(4) -0.0028(3) C61 0.057(2) 0.0278(16) 0.055(2) 0.0048(14) 0.0089(16) -0.0039(14) C62 0.076(2) 0.0432(19) 0.053(2) 0.0215(16) 0.0258(18) 0.0029(17) C63 0.0353(19) 0.058(2) 0.106(3) 0.017(2) 0.007(2) -0.0112(17) Si7 0.0477(5) 0.0344(4) 0.0338(4) 0.0089(4) -0.0056(4) 0.0028(4) C71 0.074(2) 0.0467(19) 0.0371(18) 0.0059(15) -0.0153(17) 0.0025(17) C72 0.060(2) 0.052(2) 0.058(2) 0.0084(17) -0.0167(18) 0.0139(18) C73 0.087(3) 0.045(2) 0.046(2) 0.0205(16) 0.0069(18) -0.0018(19) Si8 0.0289(4) 0.0333(4) 0.0378(4) 0.0058(3) 0.0027(3) 0.0014(3) C81 0.0342(17) 0.0442(19) 0.076(2) 0.0043(18) 0.0023(17) -0.0046(15) C82 0.050(2) 0.068(2) 0.053(2) 0.0208(18) -0.0077(16) 0.0127(18) C83 0.0433(18) 0.0460(18) 0.0495(19) 0.0092(15) 0.0181(15) 0.0066(15) _geom_special_details ; All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes. ; loop_ _geom_bond_atom_site_label_1 _geom_bond_atom_site_label_2 _geom_bond_distance _geom_bond_site_symmetry_2 _geom_bond_publ_flag C1 Si1 1.901(3) . ? C1 Si2 1.904(3) . ? C1 Si3 1.906(3) . ? C1 Si4 1.916(3) . ? Si1 Si1 2.3738(17) 2_665 ? Si1 H1B 1.43(2) . ? Si1 H1A 1.40(2) . ? Si2 C22 1.872(3) . ? Si2 C23 1.880(3) . ? Si2 C21 1.883(3) . ? C21 H21A 0.9700 . ? C21 H21B 0.9700 . ? C21 H21C 0.9700 . ? C22 H22A 0.9700 . ? C22 H22B 0.9700 . ? C22 H22C 0.9700 . ? C23 H23A 0.9700 . ? C23 H23B 0.9700 . ? C23 H23C 0.9700 . ? Si3 C32 1.869(3) . ? Si3 C31 1.871(3) . ? Si3 C33 1.872(3) . ? C31 H31A 0.9700 . ? C31 H31B 0.9700 . ? C31 H31C 0.9700 . ? C32 H32A 0.9700 . ? C32 H32B 0.9700 . ? C32 H32C 0.9700 . ? C33 H33A 0.9700 . ? C33 H33B 0.9700 . ? C33 H33C 0.9700 . ? Si4 C42 1.870(3) . ? Si4 C41 1.877(3) . ? Si4 C43 1.877(3) . ? C41 H41A 0.9700 . ? C41 H41B 0.9700 . ? C41 H41C 0.9700 . ? C42 H42A 0.9700 . ? C42 H42B 0.9700 . ? C42 H42C 0.9700 . ? C43 H43A 0.9700 . ? C43 H43B 0.9700 . ? C43 H43C 0.9700 . ? C2 Si5 1.897(3) . ? C2 Si7 1.900(3) . ? C2 Si8 1.906(3) . ? C2 Si6 1.913(3) . ? Si5 Si5 2.3776(17) 2_566 ? Si5 H5B 1.44(3) . ? Si5 H5A 1.45(3) . ? Si6 C62 1.870(3) . ? Si6 C63 1.873(4) . ? Si6 C61 1.877(3) . ? C61 H61A 0.9700 . ? C61 H61B 0.9700 . ? C61 H61C 0.9700 . ? C62 H62A 0.9700 . ? C62 H62B 0.9700 . ? C62 H62C 0.9700 . ? C63 H63A 0.9700 . ? C63 H63B 0.9700 . ? C63 H63C 0.9700 . ? Si7 C73 1.875(3) . ? Si7 C72 1.878(3) . ? Si7 C71 1.886(3) . ? C71 H71A 0.9700 . ? C71 H71B 0.9700 . ? C71 H71C 0.9700 . ? C72 H72A 0.9700 . ? C72 H72B 0.9700 . ? C72 H72C 0.9700 . ? C73 H73A 0.9700 . ? C73 H73B 0.9700 . ? C73 H73C 0.9700 . ? Si8 C83 1.871(3) . ? Si8 C82 1.876(3) . ? Si8 C81 1.878(3) . ? C81 H81A 0.9700 . ? C81 H81B 0.9700 . ? C81 H81C 0.9700 . ? C82 H82A 0.9700 . ? C82 H82B 0.9700 . ? C82 H82C 0.9700 . ? C83 H83A 0.9700 . ? C83 H83B 0.9700 . ? C83 H83C 0.9700 . ? 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 _geom_angle_publ_flag Si1 C1 Si2 110.52(13) . . ? Si1 C1 Si3 108.06(13) . . ? Si2 C1 Si3 111.60(13) . . ? Si1 C1 Si4 103.85(13) . . ? Si2 C1 Si4 111.10(13) . . ? Si3 C1 Si4 111.40(13) . . ? C1 Si1 Si1 120.05(9) . 2_665 ? C1 Si1 H1B 106.6(10) . . ? Si1 Si1 H1B 107.8(10) 2_665 . ? C1 Si1 H1A 109.0(10) . . ? Si1 Si1 H1A 107.1(10) 2_665 . ? H1B Si1 H1A 105.4(14) . . ? C22 Si2 C23 106.61(16) . . ? C22 Si2 C21 105.46(15) . . ? C23 Si2 C21 105.70(16) . . ? C22 Si2 C1 112.14(13) . . ? C23 Si2 C1 113.62(13) . . ? C21 Si2 C1 112.70(13) . . ? Si2 C21 H21A 109.5 . . ? Si2 C21 H21B 109.5 . . ? H21A C21 H21B 109.5 . . ? Si2 C21 H21C 109.5 . . ? H21A C21 H21C 109.5 . . ? H21B C21 H21C 109.5 . . ? Si2 C22 H22A 109.5 . . ? Si2 C22 H22B 109.5 . . ? H22A C22 H22B 109.5 . . ? Si2 C22 H22C 109.5 . . ? H22A C22 H22C 109.5 . . ? H22B C22 H22C 109.5 . . ? Si2 C23 H23A 109.5 . . ? Si2 C23 H23B 109.5 . . ? H23A C23 H23B 109.5 . . ? Si2 C23 H23C 109.5 . . ? H23A C23 H23C 109.5 . . ? H23B C23 H23C 109.5 . . ? C32 Si3 C31 104.31(15) . . ? C32 Si3 C33 106.43(15) . . ? C31 Si3 C33 107.11(15) . . ? C32 Si3 C1 112.85(14) . . ? C31 Si3 C1 112.60(12) . . ? C33 Si3 C1 112.92(13) . . ? Si3 C31 H31A 109.5 . . ? Si3 C31 H31B 109.5 . . ? H31A C31 H31B 109.5 . . ? Si3 C31 H31C 109.5 . . ? H31A C31 H31C 109.5 . . ? H31B C31 H31C 109.5 . . ? Si3 C32 H32A 109.5 . . ? Si3 C32 H32B 109.5 . . ? H32A C32 H32B 109.5 . . ? Si3 C32 H32C 109.5 . . ? H32A C32 H32C 109.5 . . ? H32B C32 H32C 109.5 . . ? Si3 C33 H33A 109.5 . . ? Si3 C33 H33B 109.5 . . ? H33A C33 H33B 109.5 . . ? Si3 C33 H33C 109.5 . . ? H33A C33 H33C 109.5 . . ? H33B C33 H33C 109.5 . . ? C42 Si4 C41 106.90(15) . . ? C42 Si4 C43 106.99(17) . . ? C41 Si4 C43 105.19(16) . . ? C42 Si4 C1 112.51(14) . . ? C41 Si4 C1 113.19(13) . . ? C43 Si4 C1 111.56(14) . . ? Si4 C41 H41A 109.5 . . ? Si4 C41 H41B 109.5 . . ? H41A C41 H41B 109.5 . . ? Si4 C41 H41C 109.5 . . ? H41A C41 H41C 109.5 . . ? H41B C41 H41C 109.5 . . ? Si4 C42 H42A 109.5 . . ? Si4 C42 H42B 109.5 . . ? H42A C42 H42B 109.5 . . ? Si4 C42 H42C 109.5 . . ? H42A C42 H42C 109.5 . . ? H42B C42 H42C 109.5 . . ? Si4 C43 H43A 109.5 . . ? Si4 C43 H43B 109.5 . . ? H43A C43 H43B 109.5 . . ? Si4 C43 H43C 109.5 . . ? H43A C43 H43C 109.5 . . ? H43B C43 H43C 109.5 . . ? Si5 C2 Si7 110.86(13) . . ? Si5 C2 Si8 107.98(13) . . ? Si7 C2 Si8 112.08(13) . . ? Si5 C2 Si6 104.58(13) . . ? Si7 C2 Si6 110.44(13) . . ? Si8 C2 Si6 110.62(13) . . ? C2 Si5 Si5 119.70(10) . 2_566 ? C2 Si5 H5B 109.0(10) . . ? Si5 Si5 H5B 107.3(10) 2_566 . ? C2 Si5 H5A 108.2(11) . . ? Si5 Si5 H5A 106.4(10) 2_566 . ? H5B Si5 H5A 105.3(15) . . ? C62 Si6 C63 104.39(18) . . ? C62 Si6 C61 107.10(15) . . ? C63 Si6 C61 106.49(17) . . ? C62 Si6 C2 113.26(14) . . ? C63 Si6 C2 112.34(15) . . ? C61 Si6 C2 112.66(13) . . ? Si6 C61 H61A 109.5 . . ? Si6 C61 H61B 109.5 . . ? H61A C61 H61B 109.5 . . ? Si6 C61 H61C 109.5 . . ? H61A C61 H61C 109.5 . . ? H61B C61 H61C 109.5 . . ? Si6 C62 H62A 109.5 . . ? Si6 C62 H62B 109.5 . . ? H62A C62 H62B 109.5 . . ? Si6 C62 H62C 109.5 . . ? H62A C62 H62C 109.5 . . ? H62B C62 H62C 109.5 . . ? Si6 C63 H63A 109.5 . . ? Si6 C63 H63B 109.5 . . ? H63A C63 H63B 109.5 . . ? Si6 C63 H63C 109.5 . . ? H63A C63 H63C 109.5 . . ? H63B C63 H63C 109.5 . . ? C73 Si7 C72 106.26(17) . . ? C73 Si7 C71 106.19(16) . . ? C72 Si7 C71 106.30(16) . . ? C73 Si7 C2 112.02(14) . . ? C72 Si7 C2 112.48(14) . . ? C71 Si7 C2 113.08(13) . . ? Si7 C71 H71A 109.5 . . ? Si7 C71 H71B 109.5 . . ? H71A C71 H71B 109.5 . . ? Si7 C71 H71C 109.5 . . ? H71A C71 H71C 109.5 . . ? H71B C71 H71C 109.5 . . ? Si7 C72 H72A 109.5 . . ? Si7 C72 H72B 109.5 . . ? H72A C72 H72B 109.5 . . ? Si7 C72 H72C 109.5 . . ? H72A C72 H72C 109.5 . . ? H72B C72 H72C 109.5 . . ? Si7 C73 H73A 109.5 . . ? Si7 C73 H73B 109.5 . . ? H73A C73 H73B 109.5 . . ? Si7 C73 H73C 109.5 . . ? H73A C73 H73C 109.5 . . ? H73B C73 H73C 109.5 . . ? C83 Si8 C82 106.31(15) . . ? C83 Si8 C81 106.59(15) . . ? C82 Si8 C81 104.47(17) . . ? C83 Si8 C2 112.90(14) . . ? C82 Si8 C2 112.68(14) . . ? C81 Si8 C2 113.23(13) . . ? Si8 C81 H81A 109.5 . . ? Si8 C81 H81B 109.5 . . ? H81A C81 H81B 109.5 . . ? Si8 C81 H81C 109.5 . . ? H81A C81 H81C 109.5 . . ? H81B C81 H81C 109.5 . . ? Si8 C82 H82A 109.5 . . ? Si8 C82 H82B 109.5 . . ? H82A C82 H82B 109.5 . . ? Si8 C82 H82C 109.5 . . ? H82A C82 H82C 109.5 . . ? H82B C82 H82C 109.5 . . ? Si8 C83 H83A 109.5 . . ? Si8 C83 H83B 109.5 . . ? H83A C83 H83B 109.5 . . ? Si8 C83 H83C 109.5 . . ? H83A C83 H83C 109.5 . . ? H83B C83 H83C 109.5 . . ? 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_2 _geom_torsion_site_symmetry_3 _geom_torsion_site_symmetry_4 _geom_torsion_publ_flag Si2 C1 Si1 Si1 -39.31(16) . . . 2_665 ? Si3 C1 Si1 Si1 83.07(13) . . . 2_665 ? Si4 C1 Si1 Si1 -158.53(8) . . . 2_665 ? Si1 C1 Si2 C22 78.47(17) . . . . ? Si3 C1 Si2 C22 -41.82(18) . . . . ? Si4 C1 Si2 C22 -166.80(14) . . . . ? Si1 C1 Si2 C23 -160.56(15) . . . . ? Si3 C1 Si2 C23 79.15(18) . . . . ? Si4 C1 Si2 C23 -45.83(19) . . . . ? Si1 C1 Si2 C21 -40.36(18) . . . . ? Si3 C1 Si2 C21 -160.64(14) . . . . ? Si4 C1 Si2 C21 74.37(17) . . . . ? Si1 C1 Si3 C32 77.12(17) . . . . ? Si2 C1 Si3 C32 -161.16(15) . . . . ? Si4 C1 Si3 C32 -36.34(19) . . . . ? Si1 C1 Si3 C31 -40.65(18) . . . . ? Si2 C1 Si3 C31 81.07(17) . . . . ? Si4 C1 Si3 C31 -154.12(14) . . . . ? Si1 C1 Si3 C33 -162.12(14) . . . . ? Si2 C1 Si3 C33 -40.40(18) . . . . ? Si4 C1 Si3 C33 84.41(17) . . . . ? Si1 C1 Si4 C42 -161.93(14) . . . . ? Si2 C1 Si4 C42 79.24(18) . . . . ? Si3 C1 Si4 C42 -45.86(19) . . . . ? Si1 C1 Si4 C41 -40.60(17) . . . . ? Si2 C1 Si4 C41 -159.43(14) . . . . ? Si3 C1 Si4 C41 75.47(17) . . . . ? Si1 C1 Si4 C43 77.81(17) . . . . ? Si2 C1 Si4 C43 -41.02(19) . . . . ? Si3 C1 Si4 C43 -166.12(16) . . . . ? Si7 C2 Si5 Si5 -40.27(16) . . . 2_566 ? Si8 C2 Si5 Si5 82.86(14) . . . 2_566 ? Si6 C2 Si5 Si5 -159.30(8) . . . 2_566 ? Si5 C2 Si6 C62 -39.44(18) . . . . ? Si7 C2 Si6 C62 -158.75(15) . . . . ? Si8 C2 Si6 C62 76.58(18) . . . . ? Si5 C2 Si6 C63 78.53(18) . . . . ? Si7 C2 Si6 C63 -40.8(2) . . . . ? Si8 C2 Si6 C63 -165.45(16) . . . . ? Si5 C2 Si6 C61 -161.19(14) . . . . ? Si7 C2 Si6 C61 79.50(18) . . . . ? Si8 C2 Si6 C61 -45.17(18) . . . . ? Si5 C2 Si7 C73 78.97(18) . . . . ? Si8 C2 Si7 C73 -41.76(18) . . . . ? Si6 C2 Si7 C73 -165.59(14) . . . . ? Si5 C2 Si7 C72 -40.65(19) . . . . ? Si8 C2 Si7 C72 -161.39(15) . . . . ? Si6 C2 Si7 C72 74.78(18) . . . . ? Si5 C2 Si7 C71 -161.08(15) . . . . ? Si8 C2 Si7 C71 78.19(18) . . . . ? Si6 C2 Si7 C71 -45.65(19) . . . . ? Si5 C2 Si8 C83 -163.75(14) . . . . ? Si7 C2 Si8 C83 -41.37(18) . . . . ? Si6 C2 Si8 C83 82.37(17) . . . . ? Si5 C2 Si8 C82 75.78(17) . . . . ? Si7 C2 Si8 C82 -161.83(15) . . . . ? Si6 C2 Si8 C82 -38.10(18) . . . . ? Si5 C2 Si8 C81 -42.52(19) . . . . ? Si7 C2 Si8 C81 79.87(18) . . . . ? Si6 C2 Si8 C81 -156.40(16) . . . . ? _diffrn_measured_fraction_theta_max 0.999 _diffrn_reflns_theta_full 25.05 _diffrn_measured_fraction_theta_full 0.999 _refine_diff_density_max 0.470 _refine_diff_density_min -0.275 _refine_diff_density_rms 0.055