# Supplementary Material (ESI) for ChemComm
# This journal is © The Royal Society of Chemistry 2000
# CCDC Number: 182/1770
 
data_final 
  
_audit_creation_method            SHELXL 
_chemical_name_systematic 
; 
 'Sarah L. Hinchley, Carole A. Morrison, David W. H. Rankin,* 
 Charles L. B. Macdonald,' 
'Robert J. Wiacek, Alan H. Cowley, Michael F. Lappert, Grete Gundersen,' 
'Jason A. C. Clyburne, and Philip P. Power.'
'Chem. Commun. manuscript b004889p'
; 
_chemical_name_common             'tetra(disyl)diphosphine' 
_chemical_formula_moiety          'C28 H76 P2 Si8' 
_chemical_formula_structural      '[((CH3)3Si)2)CH)2P]2 '
_chemical_formula_analytical      'n/a' 
_chemical_formula_sum             'C28 H76 P2 Si8' 
_chemical_formula_weight          699.55 
_chemical_melting_point           'n/a' 
_chemical_compound_source         'selfmade' 
  
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' 
 'P'  'P'   0.1023   0.0942 
 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' 
  
_symmetry_cell_setting            Monoclinic 
_symmetry_space_group_name_H-M    P2(1)/c 
  
loop_ 
 _symmetry_equiv_pos_as_xyz 
 'x, y, z' 
 '-x, y+1/2, -z+1/2' 
 '-x, -y, -z' 
 'x, -y-1/2, z-1/2' 
  
_cell_length_a                    18.341(2) 
_cell_length_b                    13.4240(10) 
_cell_length_c                    19.033(2) 
_cell_angle_alpha                 90.00 
_cell_angle_beta                  110.650(10) 
_cell_angle_gamma                 90.00 
_cell_volume                      4385.0(7) 
_cell_formula_units_Z             4 
_cell_measurement_temperature     173(2) 
_cell_measurement_reflns_used     55 
_cell_measurement_theta_min       4.58 
_cell_measurement_theta_max       12.49 
  
_exptl_crystal_description        blocks 
_exptl_crystal_colour             colorless 
_exptl_crystal_size_max           0.53 
_exptl_crystal_size_mid           0.40 
_exptl_crystal_size_min           0.35 
_exptl_crystal_density_meas       none 
_exptl_crystal_density_diffrn     1.060 
_exptl_crystal_density_method     none 
_exptl_crystal_F_000              1544 
_exptl_absorpt_coefficient_mu     0.335 
_exptl_absorpt_correction_type    integration 
_exptl_absorpt_correction_T_min   0.7332 
_exptl_absorpt_correction_T_max   0.7984 
  
_exptl_special_details 
; 
 'Crystals separated by Pasteur method from ClP(disyl)2 precursor' 
; 
  
_diffrn_ambient_temperature       173(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        'Siemens P4' 
_diffrn_measurement_method        '\w scans' 
_diffrn_standards_number          3 
_diffrn_standards_interval_count  97 
_diffrn_standards_interval_time   ? 
_diffrn_standards_decay_%         7.85 
_diffrn_reflns_number             9263 
_diffrn_reflns_av_R_equivalents   0.0173 
_diffrn_reflns_av_sigmaI/netI     0.0184 
_diffrn_reflns_limit_h_min        -20 
_diffrn_reflns_limit_h_max        21 
_diffrn_reflns_limit_k_min        -2 
_diffrn_reflns_limit_k_max        15 
_diffrn_reflns_limit_l_min        -22 
_diffrn_reflns_limit_l_max        21 
_diffrn_reflns_theta_min          1.19 
_diffrn_reflns_theta_max          25.06 
_reflns_number_total              7709 
_reflns_number_observed           6659 
_reflns_observed_criterion        >2sigma(I) 
  
_computing_data_collection        'Siemens XSCANS' 
_computing_cell_refinement        'Siemens XSCANS' 
_computing_data_reduction         'Siemens SHELXTL' 
_computing_structure_solution     'SHELXS-86 (Sheldrick, 1990)' 
_computing_structure_refinement   'SHELXL-93 (Sheldrick, 1993)' 
_computing_molecular_graphics     'Siemens SHELXTL' 
_computing_publication_material   'Siemens SHELXTL' 
  
_refine_special_details 
; 
 Refinement on F^2^ for ALL reflections except for 7 with very negative F^2^ 
 or flagged by the user for potential systematic errors.  Weighted R-factors 
 wR and all goodnesses 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 observed criterion 
 of F^2^ > 2sigma(F^2^) is used only for calculating _R_factor_obs 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 w=1/[\s^2^(Fo^2^)+(0.0504P)^2^+0.0000P] 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     ? 
_refine_ls_extinction_method      SHELXL 
_refine_ls_extinction_coef        0.0042(5) 
_refine_ls_extinction_expression 
 'Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^' 
_refine_ls_number_reflns          7702 
_refine_ls_number_parameters      360 
_refine_ls_number_restraints      0 
_refine_ls_R_factor_all           0.0451 
_refine_ls_R_factor_obs           0.0375 
_refine_ls_wR_factor_all          0.1203 
_refine_ls_wR_factor_obs          0.1159 
_refine_ls_goodness_of_fit_all    1.705 
_refine_ls_goodness_of_fit_obs    1.783 
_refine_ls_restrained_S_all       1.714 
_refine_ls_restrained_S_obs       1.783 
_refine_ls_shift/esd_max          -0.001 
_refine_ls_shift/esd_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_thermal_displace_type 
 _atom_site_occupancy 
 _atom_site_calc_flag 
 _atom_site_refinement_flags 
 _atom_site_disorder_group 
P1 P 0.20408(3) 0.95682(4) 0.28296(3) 0.02134(13) Uani 1 d . . 
P2 P 0.29652(3) 1.04799(4) 0.25396(3) 0.02256(13) Uani 1 d . . 
Si1 Si 0.29351(4) 0.96147(4) 0.46930(3) 0.0325(2) Uani 1 d . . 
Si2 Si 0.10950(4) 0.98309(5) 0.39171(4) 0.0356(2) Uani 1 d . . 
Si3 Si 0.16268(3) 0.72813(4) 0.25176(3) 0.0314(2) Uani 1 d . . 
Si4 Si 0.33902(3) 0.78374(4) 0.28964(4) 0.0345(2) Uani 1 d . . 
Si5 Si 0.14847(4) 1.04027(5) 0.08840(4) 0.0440(2) Uani 1 d . . 
Si6 Si 0.32044(4) 1.07362(5) 0.09732(4) 0.0435(2) Uani 1 d . . 
Si7 Si 0.40748(4) 1.22734(5) 0.32635(3) 0.0372(2) Uani 1 d . . 
Si8 Si 0.22562(4) 1.27140(4) 0.27365(4) 0.0358(2) Uani 1 d . . 
C1 C 0.20878(12) 0.99463(15) 0.38025(11) 0.0262(4) Uani 1 d . . 
C2 C 0.24284(11) 0.82459(14) 0.29631(12) 0.0254(4) Uani 1 d . . 
C3 C 0.24918(13) 1.0809(2) 0.15109(11) 0.0298(5) Uani 1 d . . 
C4 C 0.30472(12) 1.17280(14) 0.30230(11) 0.0255(4) Uani 1 d . . 
C5 C 0.38337(14) 1.0251(2) 0.46975(14) 0.0486(6) Uani 1 d . . 
H5A H 0.39562(14) 1.0040(2) 0.42700(14) 0.073 Uiso 1 calc R . 
H5B H 0.42570(14) 1.0084(2) 0.51494(14) 0.073 Uiso 1 calc R . 
H5C H 0.37533(14) 1.0959(2) 0.46756(14) 0.073 Uiso 1 calc R . 
C6 C 0.2774(2) 1.0095(2) 0.55467(14) 0.0561(7) Uani 1 d . . 
H6A H 0.2314(2) 0.9796(2) 0.55840(14) 0.084 Uiso 1 calc R . 
H6B H 0.2712(2) 1.0805(2) 0.55108(14) 0.084 Uiso 1 calc R . 
H6C H 0.3215(2) 0.9931(2) 0.59846(14) 0.084 Uiso 1 calc R . 
C7 C 0.31152(15) 0.8244(2) 0.48842(13) 0.0431(6) Uani 1 d . . 
H7A H 0.26437(15) 0.7929(2) 0.48794(13) 0.065 Uiso 1 calc R . 
H7B H 0.35147(15) 0.8152(2) 0.53669(13) 0.065 Uiso 1 calc R . 
H7C H 0.32789(15) 0.7952(2) 0.45036(13) 0.065 Uiso 1 calc R . 
C8 C 0.0968(2) 1.0824(2) 0.4557(2) 0.0598(7) Uani 1 d . . 
H8A H 0.1385(2) 1.0783(2) 0.5034(2) 0.090 Uiso 1 calc R . 
H8B H 0.0479(2) 1.0731(2) 0.4627(2) 0.090 Uiso 1 calc R . 
H8C H 0.0975(2) 1.1466(2) 0.4338(2) 0.090 Uiso 1 calc R . 
C9 C 0.0968(2) 0.8597(2) 0.4316(2) 0.0532(7) Uani 1 d . . 
H9A H 0.1398(2) 0.8479(2) 0.4773(2) 0.080 Uiso 1 calc R . 
H9B H 0.0949(2) 0.8080(2) 0.3961(2) 0.080 Uiso 1 calc R . 
H9C H 0.0491(2) 0.8598(2) 0.4418(2) 0.080 Uiso 1 calc R . 
C10 C 0.02460(13) 1.0021(2) 0.30327(15) 0.0458(6) Uani 1 d . . 
H10A H 0.02963(13) 1.0651(2) 0.28154(15) 0.069 Uiso 1 calc R . 
H10B H -0.02265(13) 1.0014(2) 0.31420(15) 0.069 Uiso 1 calc R . 
H10C H 0.02310(13) 0.9497(2) 0.26852(15) 0.069 Uiso 1 calc R . 
C11 C 0.06305(13) 0.7825(2) 0.21363(15) 0.0461(6) Uani 1 d . . 
H11A H 0.06030(13) 0.8290(2) 0.17446(15) 0.069 Uiso 1 calc R . 
H11B H 0.05176(13) 0.8163(2) 0.25306(15) 0.069 Uiso 1 calc R . 
H11C H 0.02570(13) 0.7303(2) 0.19369(15) 0.069 Uiso 1 calc R . 
C12 C 0.16365(15) 0.6387(2) 0.32742(14) 0.0457(6) Uani 1 d . . 
H12A H 0.21436(15) 0.6090(2) 0.34852(14) 0.068 Uiso 1 calc R . 
H12B H 0.12551(15) 0.5876(2) 0.30660(14) 0.068 Uiso 1 calc R . 
H12C H 0.15158(15) 0.6736(2) 0.36597(14) 0.068 Uiso 1 calc R . 
C13 C 0.1725(2) 0.6538(2) 0.17219(15) 0.0514(7) Uani 1 d . . 
H13A H 0.2231(2) 0.6232(2) 0.18791(15) 0.077 Uiso 1 calc R . 
H13B H 0.1665(2) 0.6970(2) 0.13032(15) 0.077 Uiso 1 calc R . 
H13C H 0.1331(2) 0.6031(2) 0.15759(15) 0.077 Uiso 1 calc R . 
C14 C 0.42852(13) 0.8462(2) 0.35381(14) 0.0466(6) Uani 1 d . . 
H14A H 0.43018(13) 0.8407(2) 0.40464(14) 0.070 Uiso 1 calc R . 
H14B H 0.42774(13) 0.9152(2) 0.34046(14) 0.070 Uiso 1 calc R . 
H14C H 0.47373(13) 0.8148(2) 0.34938(14) 0.070 Uiso 1 calc R . 
C15 C 0.3550(2) 0.6495(2) 0.3186(2) 0.0625(8) Uani 1 d . . 
H15A H 0.3549(2) 0.6423(2) 0.3687(2) 0.094 Uiso 1 calc R . 
H15B H 0.4042(2) 0.6277(2) 0.3169(2) 0.094 Uiso 1 calc R . 
H15C H 0.3139(2) 0.6098(2) 0.2849(2) 0.094 Uiso 1 calc R . 
C16 C 0.3392(2) 0.7969(2) 0.19243(15) 0.0502(6) Uani 1 d . . 
H16A H 0.2936(2) 0.7654(2) 0.15788(15) 0.075 Uiso 1 calc R . 
H16B H 0.3850(2) 0.7658(2) 0.18907(15) 0.075 Uiso 1 calc R . 
H16C H 0.3390(2) 0.8663(2) 0.18015(15) 0.075 Uiso 1 calc R . 
C17 C 0.06727(14) 1.0802(2) 0.1195(2) 0.0605(8) Uani 1 d . . 
H17A H 0.06977(14) 1.1510(2) 0.1272(2) 0.091 Uiso 1 calc R . 
H17B H 0.07190(14) 1.0471(2) 0.1655(2) 0.091 Uiso 1 calc R . 
H17C H 0.01832(14) 1.0631(2) 0.0816(2) 0.091 Uiso 1 calc R . 
C18 C 0.1415(2) 0.9034(2) 0.07406(15) 0.0573(7) Uani 1 d . . 
H18A H 0.1829(2) 0.8812(2) 0.05801(15) 0.086 Uiso 1 calc R . 
H18B H 0.0923(2) 0.8870(2) 0.03640(15) 0.086 Uiso 1 calc R . 
H18C H 0.1459(2) 0.8710(2) 0.12036(15) 0.086 Uiso 1 calc R . 
C19 C 0.1241(2) 1.1034(2) -0.00561(15) 0.0701(9) Uani 1 d . . 
H19A H 0.1276(2) 1.1743(2) 0.00132(15) 0.105 Uiso 1 calc R . 
H19B H 0.0721(2) 1.0858(2) -0.03716(15) 0.105 Uiso 1 calc R . 
H19C H 0.1602(2) 1.0823(2) -0.02885(15) 0.105 Uiso 1 calc R . 
C20 C 0.4242(2) 1.0569(2) 0.1567(2) 0.0639(8) Uani 1 d . . 
H20A H 0.4305(2) 0.9948(2) 0.1832(2) 0.096 Uiso 1 calc R . 
H20B H 0.4403(2) 1.1106(2) 0.1922(2) 0.096 Uiso 1 calc R . 
H20C H 0.4556(2) 1.0568(2) 0.1256(2) 0.096 Uiso 1 calc R . 
C21 C 0.3016(2) 0.9713(2) 0.0259(2) 0.0642(9) Uani 1 d . . 
H21A H 0.2484(2) 0.9745(2) -0.0076(2) 0.096 Uiso 1 calc R . 
H21B H 0.3111(2) 0.9080(2) 0.0510(2) 0.096 Uiso 1 calc R . 
H21C H 0.3356(2) 0.9791(2) -0.0021(2) 0.096 Uiso 1 calc R . 
C22 C 0.3134(2) 1.1961(2) 0.0480(2) 0.0651(9) Uani 1 d . . 
H22A H 0.2603(2) 1.2079(2) 0.0164(2) 0.098 Uiso 1 calc R . 
H22B H 0.3458(2) 1.1947(2) 0.0179(2) 0.098 Uiso 1 calc R . 
H22C H 0.3305(2) 1.2485(2) 0.0845(2) 0.098 Uiso 1 calc R . 
C23 C 0.48449(14) 1.1293(2) 0.3453(2) 0.0538(7) Uani 1 d . . 
H23A H 0.47331(14) 1.0869(2) 0.3022(2) 0.081 Uiso 1 calc R . 
H23B H 0.48537(14) 1.0903(2) 0.3879(2) 0.081 Uiso 1 calc R . 
H23C H 0.53432(14) 1.1604(2) 0.3556(2) 0.081 Uiso 1 calc R . 
C24 C 0.41260(15) 1.3131(2) 0.25093(14) 0.0487(6) Uani 1 d . . 
H24A H 0.39664(15) 1.2782(2) 0.20392(14) 0.073 Uiso 1 calc R . 
H24B H 0.46513(15) 1.3364(2) 0.26306(14) 0.073 Uiso 1 calc R . 
H24C H 0.37868(15) 1.3690(2) 0.24705(14) 0.073 Uiso 1 calc R . 
C25 C 0.4392(2) 1.3007(2) 0.4152(2) 0.0695(9) Uani 1 d . . 
H25A H 0.4375(2) 1.2592(2) 0.4557(2) 0.104 Uiso 1 calc R . 
H25B H 0.4051(2) 1.3566(2) 0.4099(2) 0.104 Uiso 1 calc R . 
H25C H 0.4915(2) 1.3240(2) 0.4259(2) 0.104 Uiso 1 calc R . 
C26 C 0.1970(2) 1.3234(2) 0.17639(14) 0.0504(6) Uani 1 d . . 
H26A H 0.2425(2) 1.3470(2) 0.16783(14) 0.076 Uiso 1 calc R . 
H26B H 0.1612(2) 1.3776(2) 0.17089(14) 0.076 Uiso 1 calc R . 
H26C H 0.1724(2) 1.2723(2) 0.14058(14) 0.076 Uiso 1 calc R . 
C27 C 0.2560(2) 1.3836(2) 0.3348(2) 0.0716(9) Uani 1 d . . 
H27A H 0.3025(2) 1.4110(2) 0.3302(2) 0.107 Uiso 1 calc R . 
H27B H 0.2661(2) 1.3651(2) 0.3861(2) 0.107 Uiso 1 calc R . 
H27C H 0.2152(2) 1.4324(2) 0.3196(2) 0.107 Uiso 1 calc R . 
C28 C 0.1361(2) 1.2267(2) 0.2880(2) 0.0672(9) Uani 1 d . . 
H28A H 0.1169(2) 1.1684(2) 0.2580(2) 0.101 Uiso 1 calc R . 
H28B H 0.0971(2) 1.2779(2) 0.2735(2) 0.101 Uiso 1 calc R . 
H28C H 0.1480(2) 1.2106(2) 0.3400(2) 0.101 Uiso 1 calc R . 
H4 H 0.3006(13) 1.1551(18) 0.3463(13) 0.040(6) Uiso 1 d . . 
H2 H 0.2460(13) 0.8142(18) 0.3439(13) 0.040(6) Uiso 1 d . . 
H3 H 0.2373(13) 1.1451(19) 0.1470(12) 0.036(6) Uiso 1 d . . 
H1 H 0.2110(14) 1.0628(21) 0.3797(14) 0.049(7) Uiso 1 d . . 
  
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 
P1 0.0214(3) 0.0179(3) 0.0258(3) 0.0005(2) 0.0096(2) 0.0007(2) 
P2 0.0237(3) 0.0199(3) 0.0258(3) 0.0010(2) 0.0109(2) -0.0003(2) 
Si1 0.0418(4) 0.0300(3) 0.0256(3) 0.0021(2) 0.0117(3) -0.0053(3) 
Si2 0.0397(4) 0.0297(3) 0.0486(4) 0.0003(3) 0.0296(3) 0.0021(3) 
Si3 0.0345(3) 0.0192(3) 0.0427(3) -0.0037(2) 0.0165(3) -0.0037(2) 
Si4 0.0303(3) 0.0261(3) 0.0515(4) 0.0022(3) 0.0198(3) 0.0068(2) 
Si5 0.0483(4) 0.0418(4) 0.0309(3) 0.0073(3) 0.0002(3) -0.0099(3) 
Si6 0.0668(5) 0.0373(4) 0.0394(4) -0.0066(3) 0.0349(3) -0.0108(3) 
Si7 0.0386(3) 0.0379(4) 0.0348(3) -0.0013(3) 0.0126(3) -0.0172(3) 
Si8 0.0511(4) 0.0206(3) 0.0449(4) 0.0065(2) 0.0281(3) 0.0063(3) 
C1 0.0341(11) 0.0195(10) 0.0299(10) -0.0004(8) 0.0174(9) 0.0012(8) 
C2 0.0274(10) 0.0191(10) 0.0315(11) 0.0010(8) 0.0124(9) 0.0009(8) 
C3 0.0391(12) 0.0257(11) 0.0249(10) 0.0010(9) 0.0120(9) -0.0021(9) 
C4 0.0338(11) 0.0198(10) 0.0259(10) -0.0004(8) 0.0143(9) -0.0044(8) 
C5 0.0413(14) 0.054(2) 0.0415(13) 0.0145(12) 0.0032(11) -0.0088(12) 
C6 0.083(2) 0.056(2) 0.0328(13) -0.0073(12) 0.0249(13) -0.009(2) 
C7 0.0537(15) 0.0376(13) 0.0316(11) 0.0098(10) 0.0071(10) -0.0011(11) 
C8 0.073(2) 0.055(2) 0.070(2) -0.0096(14) 0.048(2) 0.0060(15) 
C9 0.054(2) 0.050(2) 0.070(2) 0.0102(13) 0.0388(14) -0.0063(13) 
C10 0.0334(13) 0.0382(13) 0.073(2) 0.0035(12) 0.0275(12) 0.0056(11) 
C11 0.0330(12) 0.0334(13) 0.067(2) -0.0053(12) 0.0110(12) -0.0080(10) 
C12 0.0528(15) 0.0253(12) 0.063(2) 0.0055(11) 0.0253(13) -0.0035(11) 
C13 0.064(2) 0.0356(13) 0.060(2) -0.0189(12) 0.0281(14) -0.0112(12) 
C14 0.0295(12) 0.0495(15) 0.060(2) 0.0089(13) 0.0153(11) 0.0055(11) 
C15 0.052(2) 0.0313(14) 0.109(2) 0.0121(15) 0.034(2) 0.0163(12) 
C16 0.052(2) 0.050(2) 0.061(2) -0.0102(13) 0.0355(13) 0.0017(12) 
C17 0.0376(14) 0.063(2) 0.068(2) 0.021(2) 0.0024(13) -0.0008(13) 
C18 0.069(2) 0.047(2) 0.0461(14) -0.0014(12) 0.0075(13) -0.0210(14) 
C19 0.081(2) 0.068(2) 0.0392(14) 0.0154(14) -0.0050(14) -0.017(2) 
C20 0.059(2) 0.075(2) 0.078(2) -0.017(2) 0.049(2) -0.009(2) 
C21 0.116(3) 0.046(2) 0.047(2) -0.0090(13) 0.050(2) -0.006(2) 
C22 0.114(3) 0.049(2) 0.051(2) -0.0038(13) 0.053(2) -0.025(2) 
C23 0.0299(12) 0.063(2) 0.062(2) 0.0194(14) 0.0086(11) -0.0092(12) 
C24 0.052(2) 0.0440(15) 0.057(2) 0.0059(12) 0.0279(13) -0.0116(12) 
C25 0.079(2) 0.078(2) 0.051(2) -0.019(2) 0.021(2) -0.039(2) 
C26 0.061(2) 0.0383(14) 0.0540(15) 0.0197(12) 0.0231(13) 0.0164(12) 
C27 0.121(3) 0.0328(14) 0.074(2) -0.0102(14) 0.050(2) 0.007(2) 
C28 0.056(2) 0.056(2) 0.109(3) 0.037(2) 0.052(2) 0.0267(14) 
  
_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 
P1 C1 1.892(2) . ? 
P1 C2 1.896(2) . ? 
P1 P2 2.3103(7) . ? 
P2 C4 1.892(2) . ? 
P2 C3 1.893(2) . ? 
Si1 C5 1.854(2) . ? 
Si1 C6 1.866(2) . ? 
Si1 C7 1.882(2) . ? 
Si1 C1 1.905(2) . ? 
Si2 C10 1.864(3) . ? 
Si2 C9 1.871(3) . ? 
Si2 C8 1.875(3) . ? 
Si2 C1 1.915(2) . ? 
Si3 C11 1.861(2) . ? 
Si3 C12 1.870(2) . ? 
Si3 C13 1.875(2) . ? 
Si3 C2 1.918(2) . ? 
Si4 C16 1.860(3) . ? 
Si4 C14 1.864(2) . ? 
Si4 C15 1.877(3) . ? 
Si4 C2 1.894(2) . ? 
Si5 C18 1.856(3) . ? 
Si5 C17 1.864(3) . ? 
Si5 C19 1.886(3) . ? 
Si5 C3 1.892(2) . ? 
Si6 C20 1.853(3) . ? 
Si6 C22 1.875(3) . ? 
Si6 C21 1.876(3) . ? 
Si6 C3 1.926(2) . ? 
Si7 C25 1.864(3) . ? 
Si7 C24 1.868(2) . ? 
Si7 C23 1.870(3) . ? 
Si7 C4 1.921(2) . ? 
Si8 C28 1.857(3) . ? 
Si8 C27 1.864(3) . ? 
Si8 C26 1.872(2) . ? 
Si8 C4 1.896(2) . ? 
  
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 
C1 P1 C2 103.57(9) . . ? 
C1 P1 P2 107.92(7) . . ? 
C2 P1 P2 104.83(6) . . ? 
C4 P2 C3 103.00(9) . . ? 
C4 P2 P1 106.98(6) . . ? 
C3 P2 P1 105.27(7) . . ? 
C5 Si1 C6 104.46(13) . . ? 
C5 Si1 C7 110.77(12) . . ? 
C6 Si1 C7 103.91(12) . . ? 
C5 Si1 C1 109.96(10) . . ? 
C6 Si1 C1 111.37(11) . . ? 
C7 Si1 C1 115.66(10) . . ? 
C10 Si2 C9 107.69(12) . . ? 
C10 Si2 C8 103.52(13) . . ? 
C9 Si2 C8 107.72(13) . . ? 
C10 Si2 C1 114.27(10) . . ? 
C9 Si2 C1 112.17(10) . . ? 
C8 Si2 C1 110.93(11) . . ? 
C11 Si3 C12 107.07(11) . . ? 
C11 Si3 C13 104.77(12) . . ? 
C12 Si3 C13 107.65(12) . . ? 
C11 Si3 C2 113.69(9) . . ? 
C12 Si3 C2 107.18(10) . . ? 
C13 Si3 C2 116.04(10) . . ? 
C16 Si4 C14 107.41(12) . . ? 
C16 Si4 C15 109.17(14) . . ? 
C14 Si4 C15 103.26(13) . . ? 
C16 Si4 C2 111.55(11) . . ? 
C14 Si4 C2 116.85(10) . . ? 
C15 Si4 C2 108.11(11) . . ? 
C18 Si5 C17 108.10(14) . . ? 
C18 Si5 C19 108.95(13) . . ? 
C17 Si5 C19 102.89(14) . . ? 
C18 Si5 C3 112.30(12) . . ? 
C17 Si5 C3 115.37(11) . . ? 
C19 Si5 C3 108.70(12) . . ? 
C20 Si6 C22 106.61(15) . . ? 
C20 Si6 C21 103.94(15) . . ? 
C22 Si6 C21 108.47(12) . . ? 
C20 Si6 C3 115.17(11) . . ? 
C22 Si6 C3 106.35(12) . . ? 
C21 Si6 C3 115.85(12) . . ? 
C25 Si7 C24 106.71(13) . . ? 
C25 Si7 C23 102.91(15) . . ? 
C24 Si7 C23 110.06(12) . . ? 
C25 Si7 C4 112.57(12) . . ? 
C24 Si7 C4 111.28(10) . . ? 
C23 Si7 C4 112.86(10) . . ? 
C28 Si8 C27 104.8(2) . . ? 
C28 Si8 C26 108.17(13) . . ? 
C27 Si8 C26 103.52(13) . . ? 
C28 Si8 C4 111.01(10) . . ? 
C27 Si8 C4 110.73(13) . . ? 
C26 Si8 C4 117.66(10) . . ? 
P1 C1 Si1 123.33(11) . . ? 
P1 C1 Si2 111.88(10) . . ? 
Si1 C1 Si2 112.94(10) . . ? 
Si4 C2 P1 125.19(11) . . ? 
Si4 C2 Si3 111.21(10) . . ? 
P1 C2 Si3 112.35(10) . . ? 
Si5 C3 P2 125.07(11) . . ? 
Si5 C3 Si6 110.17(10) . . ? 
P2 C3 Si6 112.83(11) . . ? 
P2 C4 Si8 123.83(11) . . ? 
P2 C4 Si7 110.88(10) . . ? 
Si8 C4 Si7 112.91(10) . . ? 
  
_refine_diff_density_max    0.295 
_refine_diff_density_min   -0.312 
_refine_diff_density_rms    0.055