# Supplementary Material (ESI) for Dalton Transactions
# This journal is © The Royal Society of Chemistry 1999
# CCDC Number: 186/1617
 
data_feb1296 
  
_audit_creation_method            SHELXL 
_chemical_name_systematic 
; 
  ? 
; 
_chemical_name_common             '[V2(H)2{SiMe3N(CH2CH2NSiMe3)2}2]' 
_chemical_formula_moiety          ? 
_chemical_formula_structural      ? 
_chemical_formula_analytical      ? 
_chemical_formula_sum             'C26 H72 N6 Si6 V2' 
_chemical_formula_weight          739.32 
_chemical_melting_point           ? 
_chemical_compound_source         ? 
  
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' 
 'Si'  'Si'   0.0817   0.0704 
 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' 
 'V'  'V'   0.3005   0.5294 
 '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)/n 
  
loop_ 
 _symmetry_equiv_pos_as_xyz 
 'x, y, z' 
 'x+1/2, -y+1/2, z+1/2' 
 '-x, -y, -z' 
 '-x-1/2, y-1/2, -z-1/2' 
  
_cell_length_a                    10.562(5) 
_cell_length_b                    18.902(2) 
_cell_length_c                    11.236 
_cell_angle_alpha                 90.00(3) 
_cell_angle_beta                  113.73 
_cell_angle_gamma                 90.00 
_cell_volume                      2053.5(10) 
_cell_formula_units_Z             2 
_cell_measurement_temperature     173(2) 
_cell_measurement_reflns_used     25 
_cell_measurement_theta_min       7 
_cell_measurement_theta_max       10 
  
_exptl_crystal_description        'block' 
_exptl_crystal_colour             ? 
_exptl_crystal_size_max           0.40 
_exptl_crystal_size_mid           0.35 
_exptl_crystal_size_min           0.20 
_exptl_crystal_density_meas       ? 
_exptl_crystal_density_diffrn     1.196 
_exptl_crystal_density_method     ? 
_exptl_crystal_F_000              800 
_exptl_absorpt_coefficient_mu     0.655 
_exptl_absorpt_correction_type    empirical 
_exptl_absorpt_correction_T_min   0.87 
_exptl_absorpt_correction_T_max   1.00 
  
_exptl_special_details 
; 
  ? 
; 
  
_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        ' Enraf-Nonius CAD4' 
_diffrn_measurement_method        \w--2\q 
_diffrn_standards_number          2 
_diffrn_standards_interval_count  ? 
_diffrn_standards_interval_time   120 
_diffrn_standards_decay_%         0 
_diffrn_reflns_number             5193 
_diffrn_reflns_av_R_equivalents   0.0506 
_diffrn_reflns_av_sigmaI/netI     0.0659 
_diffrn_reflns_limit_h_min        0 
_diffrn_reflns_limit_h_max        13 
_diffrn_reflns_limit_k_min        0 
_diffrn_reflns_limit_k_max        24 
_diffrn_reflns_limit_l_min        -14 
_diffrn_reflns_limit_l_max        13 
_diffrn_reflns_theta_min          2.15 
_diffrn_reflns_theta_max          27.99 
_reflns_number_total              4946 
_reflns_number_observed           3800 
_reflns_observed_criterion        >2sigma(I) 
  
_computing_data_collection        'Enraf-Nonius CAD4' 
_computing_cell_refinement        'Enraf-Nonius CAD4' 
_computing_data_reduction         ? 
_computing_structure_solution     'SHELXS-86 (Sheldrick, 1990)' 
_computing_structure_refinement   'SHELXL-93 (Sheldrick, 1993)' 
_computing_molecular_graphics     'CAMERON (Watkin and Pearce,1993)' 
_computing_publication_material   SHELXL-93 
  
_refine_special_details 
; 
 Refinement on F^2^ for ALL reflections except for 0 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^)+(0.0523P)^2^+1.5657P] 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     riding 
_refine_ls_extinction_method      none 
_refine_ls_extinction_coef        ? 
_refine_ls_number_reflns          4946 
_refine_ls_number_parameters      185 
_refine_ls_number_restraints      0 
_refine_ls_R_factor_all           0.0698 
_refine_ls_R_factor_obs           0.0480 
_refine_ls_wR_factor_all          0.1265 
_refine_ls_wR_factor_obs          0.1125 
_refine_ls_goodness_of_fit_all    0.998 
_refine_ls_goodness_of_fit_obs    1.016 
_refine_ls_restrained_S_all       0.998 
_refine_ls_restrained_S_obs       1.016 
_refine_ls_shift/esd_max          0.000 
_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 
V V 0.09437(4) 0.04528(2) 0.09661(4) 0.01705(12) Uani 1 d . . 
H1 H -0.0607(30) -0.0098(15) 0.0645(27) 0.018(7) Uiso 1 d . . 
Si1 Si 0.20053(8) -0.03278(4) 0.38240(7) 0.0211(2) Uani 1 d . . 
Si2 Si 0.28877(8) 0.14995(4) -0.01833(7) 0.0229(2) Uani 1 d . . 
Si3 Si -0.12437(8) 0.16573(4) 0.11890(8) 0.0251(2) Uani 1 d . . 
N1 N 0.2218(2) -0.00506(12) 0.2444(2) 0.0205(5) Uani 1 d . . 
N2 N 0.2823(2) 0.10483(12) 0.1203(2) 0.0204(5) Uani 1 d . . 
N3 N 0.0362(2) 0.13596(12) 0.1342(2) 0.0228(5) Uani 1 d . . 
C1 C 0.3693(3) 0.0034(2) 0.2716(3) 0.0265(6) Uani 1 d . . 
H1A H 0.4109(3) -0.0438(2) 0.2735(3) 0.032 Uiso 1 calc R . 
H1B H 0.4174(3) 0.0253(2) 0.3582(3) 0.032 Uiso 1 calc R . 
C2 C 0.3901(3) 0.0491(2) 0.1696(3) 0.0254(6) Uani 1 d . . 
H2A H 0.4826(3) 0.0715(2) 0.2080(3) 0.030 Uiso 1 calc R . 
H2B H 0.3867(3) 0.0189(2) 0.0963(3) 0.030 Uiso 1 calc R . 
C3 C 0.2882(3) 0.1530(2) 0.2268(3) 0.0265(6) Uani 1 d . . 
H3A H 0.3597(3) 0.1896(2) 0.2405(3) 0.032 Uiso 1 calc R . 
H3B H 0.3140(3) 0.1258(2) 0.3085(3) 0.032 Uiso 1 calc R . 
C4 C 0.1492(3) 0.1880(2) 0.1932(3) 0.0304(7) Uani 1 d . . 
H4A H 0.1448(3) 0.2080(2) 0.2728(3) 0.037 Uiso 1 calc R . 
H4B H 0.1377(3) 0.2273(2) 0.1314(3) 0.037 Uiso 1 calc R . 
C5 C 0.3055(4) -0.1146(2) 0.4489(3) 0.0367(7) Uani 1 d . . 
H5A H 0.4025(4) -0.1053(2) 0.4660(3) 0.055 Uiso 1 calc R . 
H5B H 0.2706(4) -0.1531(2) 0.3855(3) 0.055 Uiso 1 calc R . 
H5C H 0.2981(4) -0.1283(2) 0.5301(3) 0.055 Uiso 1 calc R . 
C6 C 0.2607(3) 0.0377(2) 0.5100(3) 0.0323(7) Uani 1 d . . 
H6A H 0.3575(3) 0.0493(2) 0.5294(3) 0.049 Uiso 1 calc R . 
H6B H 0.2528(3) 0.0206(2) 0.5890(3) 0.049 Uiso 1 calc R . 
H6C H 0.2035(3) 0.0800(2) 0.4783(3) 0.049 Uiso 1 calc R . 
C7 C 0.0181(3) -0.0518(2) 0.3511(3) 0.0328(7) Uani 1 d . . 
H7A H -0.0175(3) -0.0886(2) 0.2845(3) 0.049 Uiso 1 calc R . 
H7B H -0.0371(3) -0.0087(2) 0.3207(3) 0.049 Uiso 1 calc R . 
H7C H 0.0123(3) -0.0681(2) 0.4315(3) 0.049 Uiso 1 calc R . 
C8 C 0.1225(3) 0.1958(2) -0.1125(3) 0.0338(7) Uani 1 d . . 
H8A H 0.1033(3) 0.2300(2) -0.0563(3) 0.051 Uiso 1 calc R . 
H8B H 0.0476(3) 0.1609(2) -0.1444(3) 0.051 Uiso 1 calc R . 
H8C H 0.1290(3) 0.2206(2) -0.1864(3) 0.051 Uiso 1 calc R . 
C9 C 0.3305(3) 0.0843(2) -0.1203(3) 0.0305(7) Uani 1 d . . 
H9A H 0.4185(3) 0.0611(2) -0.0681(3) 0.046 Uiso 1 calc R . 
H9B H 0.3383(3) 0.1084(2) -0.1943(3) 0.046 Uiso 1 calc R . 
H9C H 0.2569(3) 0.0488(2) -0.1523(3) 0.046 Uiso 1 calc R . 
C10 C 0.4302(3) 0.2171(2) 0.0391(3) 0.0353(7) Uani 1 d . . 
H10A H 0.4102(3) 0.2523(2) 0.0932(3) 0.053 Uiso 1 calc R . 
H10B H 0.4366(3) 0.2406(2) -0.0360(3) 0.053 Uiso 1 calc R . 
H10C H 0.5182(3) 0.1937(2) 0.0904(3) 0.053 Uiso 1 calc R . 
C11 C -0.1680(4) 0.1356(2) 0.2557(4) 0.0518(10) Uani 1 d . . 
H11A H -0.0958(4) 0.1512(2) 0.3383(4) 0.078 Uiso 1 calc R . 
H11B H -0.1741(4) 0.0839(2) 0.2547(4) 0.078 Uiso 1 calc R . 
H11C H -0.2570(4) 0.1559(2) 0.2460(4) 0.078 Uiso 1 calc R . 
C12 C -0.2621(4) 0.1357(2) -0.0366(4) 0.0532(11) Uani 1 d . . 
H12A H -0.2401(4) 0.1514(2) -0.1093(4) 0.080 Uiso 1 calc R . 
H12B H -0.3509(4) 0.1560(2) -0.0457(4) 0.080 Uiso 1 calc R . 
H12C H -0.2680(4) 0.0840(2) -0.0370(4) 0.080 Uiso 1 calc R . 
C13 C -0.1300(4) 0.2644(2) 0.1184(4) 0.0522(10) Uani 1 d . . 
H13A H -0.0585(4) 0.2825(2) 0.1992(4) 0.078 Uiso 1 calc R . 
H13B H -0.2211(4) 0.2802(2) 0.1114(4) 0.078 Uiso 1 calc R . 
H13C H -0.1134(4) 0.2824(2) 0.0441(4) 0.078 Uiso 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 
V 0.0169(2) 0.0165(2) 0.0158(2) -0.0012(2) 0.0046(2) -0.0004(2) 
Si1 0.0232(4) 0.0202(4) 0.0173(3) 0.0005(3) 0.0055(3) -0.0001(3) 
Si2 0.0229(4) 0.0214(4) 0.0229(4) -0.0011(3) 0.0078(3) -0.0032(3) 
Si3 0.0267(4) 0.0210(4) 0.0290(4) -0.0021(3) 0.0127(3) 0.0041(3) 
N1 0.0183(11) 0.0214(11) 0.0188(10) -0.0004(9) 0.0046(9) 0.0011(9) 
N2 0.0173(11) 0.0209(11) 0.0208(11) -0.0020(9) 0.0054(9) -0.0001(9) 
N3 0.0231(12) 0.0190(11) 0.0262(12) -0.0043(9) 0.0099(10) -0.0020(9) 
C1 0.0205(14) 0.032(2) 0.0239(14) 0.0013(12) 0.0059(11) 0.0021(12) 
C2 0.0174(13) 0.0289(15) 0.0297(15) 0.0021(12) 0.0093(11) 0.0024(11) 
C3 0.0254(15) 0.0274(15) 0.0251(14) -0.0086(11) 0.0086(12) -0.0090(12) 
C4 0.031(2) 0.0240(14) 0.036(2) -0.0122(13) 0.0136(13) -0.0064(12) 
C5 0.046(2) 0.028(2) 0.037(2) 0.0090(13) 0.018(2) 0.0067(14) 
C6 0.032(2) 0.038(2) 0.0247(14) -0.0099(13) 0.0090(13) -0.0035(13) 
C7 0.033(2) 0.039(2) 0.0273(15) -0.0035(13) 0.0126(13) -0.0087(14) 
C8 0.035(2) 0.033(2) 0.029(2) 0.0017(13) 0.0074(13) 0.0038(13) 
C9 0.032(2) 0.033(2) 0.0274(15) -0.0020(12) 0.0129(13) -0.0021(13) 
C10 0.035(2) 0.032(2) 0.039(2) -0.0015(14) 0.0138(14) -0.0107(14) 
C11 0.055(2) 0.059(2) 0.055(2) 0.018(2) 0.037(2) 0.023(2) 
C12 0.032(2) 0.064(3) 0.052(2) -0.025(2) 0.005(2) 0.013(2) 
C13 0.045(2) 0.029(2) 0.083(3) 0.000(2) 0.026(2) 0.008(2) 
  
_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 
V N1 1.917(2) . ? 
V N3 1.924(2) . ? 
V N2 2.203(2) . ? 
V V 2.8521(12) 3 ? 
V H1 1.85(3) . ? 
Si1 N1 1.735(2) . ? 
Si1 C7 1.849(3) . ? 
Si1 C6 1.871(3) . ? 
Si1 C5 1.875(3) . ? 
Si2 N2 1.801(2) . ? 
Si2 C9 1.858(3) . ? 
Si2 C8 1.860(3) . ? 
Si2 C10 1.867(3) . ? 
Si3 N3 1.728(3) . ? 
Si3 C12 1.856(4) . ? 
Si3 C11 1.862(4) . ? 
Si3 C13 1.866(4) . ? 
N1 C1 1.471(4) . ? 
N2 C3 1.485(3) . ? 
N2 C2 1.485(3) . ? 
N3 C4 1.481(4) . ? 
C1 C2 1.520(4) . ? 
C1 H1A 0.99 . ? 
C1 H1B 0.99 . ? 
C2 H2A 0.99 . ? 
C2 H2B 0.99 . ? 
C3 C4 1.514(4) . ? 
C3 H3A 0.99 . ? 
C3 H3B 0.99 . ? 
C4 H4A 0.99 . ? 
C4 H4B 0.99 . ? 
C5 H5A 0.98 . ? 
C5 H5B 0.98 . ? 
C5 H5C 0.98 . ? 
C6 H6A 0.98 . ? 
C6 H6B 0.98 . ? 
C6 H6C 0.98 . ? 
C7 H7A 0.98 . ? 
C7 H7B 0.98 . ? 
C7 H7C 0.98 . ? 
C8 H8A 0.98 . ? 
C8 H8B 0.98 . ? 
C8 H8C 0.98 . ? 
C9 H9A 0.98 . ? 
C9 H9B 0.98 . ? 
C9 H9C 0.98 . ? 
C10 H10A 0.98 . ? 
C10 H10B 0.98 . ? 
C10 H10C 0.98 . ? 
C11 H11A 0.98 . ? 
C11 H11B 0.98 . ? 
C11 H11C 0.98 . ? 
C12 H12A 0.98 . ? 
C12 H12B 0.98 . ? 
C12 H12C 0.98 . ? 
C13 H13A 0.98 . ? 
C13 H13B 0.98 . ? 
C13 H13C 0.98 . ? 
  
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 
N1 V N3 115.27(10) . . ? 
N1 V N2 82.21(9) . . ? 
N3 V N2 82.55(9) . . ? 
N1 V V 113.17(7) . 3 ? 
N3 V V 120.97(8) . 3 ? 
N2 V V 135.92(6) . 3 ? 
N1 V H1 98.5(9) . . ? 
N3 V H1 102.0(9) . . ? 
N2 V H1 174.4(9) . . ? 
V V H1 38.8(9) 3 . ? 
N1 Si1 C7 112.87(13) . . ? 
N1 Si1 C6 110.08(13) . . ? 
C7 Si1 C6 106.91(15) . . ? 
N1 Si1 C5 109.70(13) . . ? 
C7 Si1 C5 108.6(2) . . ? 
C6 Si1 C5 108.5(2) . . ? 
N2 Si2 C9 108.53(12) . . ? 
N2 Si2 C8 110.93(13) . . ? 
C9 Si2 C8 111.37(14) . . ? 
N2 Si2 C10 109.05(13) . . ? 
C9 Si2 C10 108.16(15) . . ? 
C8 Si2 C10 108.7(2) . . ? 
N3 Si3 C12 111.11(14) . . ? 
N3 Si3 C11 112.14(15) . . ? 
C12 Si3 C11 108.8(2) . . ? 
N3 Si3 C13 110.8(2) . . ? 
C12 Si3 C13 106.9(2) . . ? 
C11 Si3 C13 106.9(2) . . ? 
C1 N1 Si1 110.8(2) . . ? 
C1 N1 V 116.2(2) . . ? 
Si1 N1 V 128.71(13) . . ? 
C3 N2 C2 110.9(2) . . ? 
C3 N2 Si2 113.8(2) . . ? 
C2 N2 Si2 111.6(2) . . ? 
C3 N2 V 98.9(2) . . ? 
C2 N2 V 101.6(2) . . ? 
Si2 N2 V 118.90(11) . . ? 
C4 N3 Si3 114.2(2) . . ? 
C4 N3 V 114.7(2) . . ? 
Si3 N3 V 130.95(13) . . ? 
N1 C1 C2 111.6(2) . . ? 
N1 C1 H1A 109.31(15) . . ? 
C2 C1 H1A 109.3(2) . . ? 
N1 C1 H1B 109.31(14) . . ? 
C2 C1 H1B 109.3(2) . . ? 
H1A C1 H1B 108.0 . . ? 
N2 C2 C1 111.3(2) . . ? 
N2 C2 H2A 109.38(14) . . ? 
C1 C2 H2A 109.38(15) . . ? 
N2 C2 H2B 109.38(14) . . ? 
C1 C2 H2B 109.4(2) . . ? 
H2A C2 H2B 108.0 . . ? 
N2 C3 C4 110.2(2) . . ? 
N2 C3 H3A 109.62(14) . . ? 
C4 C3 H3A 109.6(2) . . ? 
N2 C3 H3B 109.62(15) . . ? 
C4 C3 H3B 109.6(2) . . ? 
H3A C3 H3B 108.1 . . ? 
N3 C4 C3 110.3(2) . . ? 
N3 C4 H4A 109.6(2) . . ? 
C3 C4 H4A 109.6(2) . . ? 
N3 C4 H4B 109.6(2) . . ? 
C3 C4 H4B 109.6(2) . . ? 
H4A C4 H4B 108.1 . . ? 
Si1 C5 H5A 109.47(11) . . ? 
Si1 C5 H5B 109.47(11) . . ? 
H5A C5 H5B 109.5 . . ? 
Si1 C5 H5C 109.47(11) . . ? 
H5A C5 H5C 109.5 . . ? 
H5B C5 H5C 109.5 . . ? 
Si1 C6 H6A 109.47(10) . . ? 
Si1 C6 H6B 109.47(10) . . ? 
H6A C6 H6B 109.5 . . ? 
Si1 C6 H6C 109.47(10) . . ? 
H6A C6 H6C 109.5 . . ? 
H6B C6 H6C 109.5 . . ? 
Si1 C7 H7A 109.47(10) . . ? 
Si1 C7 H7B 109.47(11) . . ? 
H7A C7 H7B 109.5 . . ? 
Si1 C7 H7C 109.47(10) . . ? 
H7A C7 H7C 109.5 . . ? 
H7B C7 H7C 109.5 . . ? 
Si2 C8 H8A 109.47(10) . . ? 
Si2 C8 H8B 109.47(11) . . ? 
H8A C8 H8B 109.5 . . ? 
Si2 C8 H8C 109.47(11) . . ? 
H8A C8 H8C 109.5 . . ? 
H8B C8 H8C 109.5 . . ? 
Si2 C9 H9A 109.47(10) . . ? 
Si2 C9 H9B 109.47(10) . . ? 
H9A C9 H9B 109.5 . . ? 
Si2 C9 H9C 109.47(10) . . ? 
H9A C9 H9C 109.5 . . ? 
H9B C9 H9C 109.5 . . ? 
Si2 C10 H10A 109.47(11) . . ? 
Si2 C10 H10B 109.47(11) . . ? 
H10A C10 H10B 109.5 . . ? 
Si2 C10 H10C 109.47(11) . . ? 
H10A C10 H10C 109.5 . . ? 
H10B C10 H10C 109.5 . . ? 
Si3 C11 H11A 109.47(14) . . ? 
Si3 C11 H11B 109.47(14) . . ? 
H11A C11 H11B 109.5 . . ? 
Si3 C11 H11C 109.47(12) . . ? 
H11A C11 H11C 109.5 . . ? 
H11B C11 H11C 109.5 . . ? 
Si3 C12 H12A 109.47(15) . . ? 
Si3 C12 H12B 109.47(12) . . ? 
H12A C12 H12B 109.5 . . ? 
Si3 C12 H12C 109.47(14) . . ? 
H12A C12 H12C 109.5 . . ? 
H12B C12 H12C 109.5 . . ? 
Si3 C13 H13A 109.47(14) . . ? 
Si3 C13 H13B 109.47(12) . . ? 
H13A C13 H13B 109.5 . . ? 
Si3 C13 H13C 109.47(14) . . ? 
H13A C13 H13C 109.5 . . ? 
H13B C13 H13C 109.5 . . ? 
  
_refine_diff_density_max    0.532 
_refine_diff_density_min   -0.441 
_refine_diff_density_rms    0.082