# Supplementary Material (ESI) for Chemical Communications
# This journal is © The Royal Society of Chemistry 2005




data_global
_journal_name_full               Chem.Commun.

_journal_coden_Cambridge         0182

_publ_contact_author_name        'Clemens Krempner'
_publ_contact_author_address     
;
Universitat Rostock
Insitut fur Chemie
Abt. Anorganische Chemie
Albert-Einstein-Str. 3a
D-18059 Rostock
Germany
;

_publ_contact_author_email       clemens.krempner@uni-rostock.de
_publ_contact_author_fax         '++49 381 6382'
_publ_contact_author_phone       '++49 381 6385'

loop_
_publ_author_name
_publ_author_address

C.Krempner
;
Universitat Rostock
Insitut fur Chemie
Abt. Anorganische Chemie
Albert-Einstein-Str. 3a
D-18059 Rostock
Germany
;
M.Kockerling
;
Universitat Rostock
Insitut fur Chemie
Abt. Anorganische Chemie/Festkorperchemie
Albert-Einstein-Str. 3a
D-18059 Rostock
Germany
;
'C. Mamat'
;
?
;

_publ_section_title              
;
Novel Double-Cored Oligosilane Dendrimers
Conformational Dependence of the UV Absorption Spectra
;

data_KR-979
_database_code_depnum_ccdc_archive 'CCDC 275783'

_audit_creation_method           'ct.exe (M. Kockerling, 1996)'

_chemical_name_systematic        
;
?
;
_chemical_name_common            
;
1,1,1,2,3,3,4,5,6,6,7,8,8,8-Tetradecamethyl-2,7-bis(trimethyl-
silyl)-4,5-bis(1 ,1 2 ,3 ,3 ,3 -hexamethyl-2 -trimethylsilyl-
trisilanyl)octasilane
;
_chemical_melting_point          ?
_chemical_formula_sum            'C38 H114 Si18'
_chemical_formula_weight         1076.92

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           Monoclinic
_symmetry_space_group_name_H-M   C2/c

loop_
_symmetry_equiv_pos_as_xyz
'x, y, z'
'-x, y, -z+1/2'
'x+1/2, y+1/2, z'
'-x+1/2, y+1/2, -z+1/2'
'-x, -y, -z'
'x, -y, z-1/2'
'-x+1/2, -y+1/2, -z'
'x+1/2, -y+1/2, z-1/2'

_cell_length_a                   23.2800(7)
_cell_length_b                   17.9532(6)
_cell_length_c                   17.7010(5)
_cell_angle_alpha                90.00
_cell_angle_beta                 94.237(1)
_cell_angle_gamma                90.00
_cell_volume                     7377.9(4)
_cell_formula_units_Z            4
_cell_measurement_temperature    293(2)
_cell_measurement_reflns_used    3757
_cell_measurement_theta_min      2.87
_cell_measurement_theta_max      19.22

_exptl_crystal_description       'irregular block'
_exptl_crystal_colour            white
_exptl_crystal_size_max          0.23
_exptl_crystal_size_mid          0.08
_exptl_crystal_size_min          0.08
_exptl_crystal_density_diffrn    0.970
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             2376
_exptl_absorpt_coefficient_mu    0.330
_exptl_absorpt_correction_type   SADABS

_exptl_special_details           
;
?
;

_diffrn_ambient_temperature      293(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  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_reflns_number            46850
_diffrn_reflns_av_R_equivalents  0.0804
_diffrn_reflns_av_sigmaI/netI    0.1163
_diffrn_reflns_limit_h_min       -29
_diffrn_reflns_limit_h_max       29
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_theta_min         2.66
_diffrn_reflns_theta_max         27.16
_reflns_number_total             8127
_reflns_number_gt                3613
_reflns_threshold_expression     >2sigma(I)

_computing_data_collection       'Bruker SMART'
_computing_cell_refinement       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_structure_solution    'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'

_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^)+(0.0689P)^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    mixed
_refine_ls_extinction_method     none
_refine_ls_extinction_coef       ?
_refine_ls_number_reflns         8127
_refine_ls_number_parameters     253
_refine_ls_number_restraints     0
_refine_ls_R_factor_all          0.1392
_refine_ls_R_factor_gt           0.0473
_refine_ls_wR_factor_ref         0.1293
_refine_ls_wR_factor_gt          0.1089
_refine_ls_goodness_of_fit_ref   0.852
_refine_ls_restrained_S_all      0.852
_refine_ls_shift/su_max          0.001
_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
Si1 Si 0.45446(3) 0.12587(4) 0.21323(4) 0.0406(2) Uani 1 1 d . . .
Si2 Si 0.40145(3) 0.01195(4) 0.21848(4) 0.0444(2) Uani 1 1 d . . .
Si3 Si 0.30034(3) 0.02184(5) 0.21551(4) 0.0497(2) Uani 1 1 d . . .
Si4 Si 0.26153(4) -0.09762(5) 0.18658(5) 0.0669(3) Uani 1 1 d . . .
Si5 Si 0.26218(4) 0.06033(6) 0.32843(5) 0.0668(3) Uani 1 1 d . . .
Si6 Si 0.46963(3) 0.15546(4) 0.08482(4) 0.0466(2) Uani 1 1 d . . .
Si7 Si 0.47079(3) 0.28405(4) 0.05469(4) 0.0490(2) Uani 1 1 d . . .
Si8 Si 0.53038(4) 0.30412(6) -0.04508(5) 0.0710(3) Uani 1 1 d . . .
Si9 Si 0.37791(4) 0.32436(5) 0.01158(5) 0.0627(3) Uani 1 1 d . . .
C1 C 0.41019(12) 0.20482(16) 0.24991(16) 0.0556(8) Uani 1 1 d . . .
H1A H 0.4314 0.2506 0.2479 0.083 Uiso 1 1 calc R . .
H1B H 0.4022 0.1948 0.3013 0.083 Uiso 1 1 calc R . .
H1C H 0.3746 0.2091 0.2191 0.083 Uiso 1 1 calc R . .
C2 C 0.42484(12) -0.04503(17) 0.30420(17) 0.0692(9) Uani 1 1 d . . .
H2A H 0.4026 -0.0900 0.3041 0.104 Uiso 1 1 calc R . .
H2B H 0.4190 -0.0170 0.3491 0.104 Uiso 1 1 calc R . .
H2C H 0.4649 -0.0572 0.3032 0.104 Uiso 1 1 calc R . .
C3 C 0.41530(13) -0.04750(17) 0.13380(17) 0.0672(9) Uani 1 1 d . . .
H3A H 0.3940 -0.0932 0.1359 0.101 Uiso 1 1 calc R . .
H3B H 0.4557 -0.0584 0.1343 0.101 Uiso 1 1 calc R . .
H3C H 0.4032 -0.0212 0.0882 0.101 Uiso 1 1 calc R . .
C4 C 0.27226(12) 0.08587(17) 0.13621(18) 0.0710(10) Uani 1 1 d . . .
H4A H 0.2870 0.1352 0.1456 0.106 Uiso 1 1 calc R . .
H4B H 0.2309 0.0869 0.1339 0.106 Uiso 1 1 calc R . .
H4C H 0.2846 0.0679 0.0890 0.106 Uiso 1 1 calc R . .
C5 C 0.29827(17) -0.17291(19) 0.2447(2) 0.1046(14) Uani 1 1 d . . .
H5A H 0.2811 -0.2201 0.2310 0.157 Uiso 1 1 calc R . .
H5B H 0.2942 -0.1634 0.2974 0.157 Uiso 1 1 calc R . .
H5C H 0.3384 -0.1740 0.2356 0.157 Uiso 1 1 calc R . .
C6 C 0.26618(16) -0.1201(2) 0.0842(2) 0.1000(13) Uani 1 1 d . . .
H6A H 0.2502 -0.1686 0.0738 0.150 Uiso 1 1 calc R . .
H6B H 0.3058 -0.1194 0.0724 0.150 Uiso 1 1 calc R . .
H6C H 0.2449 -0.0837 0.0538 0.150 Uiso 1 1 calc R . .
C7 C 0.18257(15) -0.1007(2) 0.2026(3) 0.1138(15) Uani 1 1 d . . .
H7A H 0.1677 -0.1495 0.1906 0.171 Uiso 1 1 calc R . .
H7B H 0.1624 -0.0646 0.1707 0.171 Uiso 1 1 calc R . .
H7C H 0.1773 -0.0896 0.2547 0.171 Uiso 1 1 calc R . .
C8 C 0.29214(14) 0.14965(18) 0.36785(19) 0.0802(10) Uani 1 1 d . . .
H8A H 0.2744 0.1614 0.4137 0.120 Uiso 1 1 calc R . .
H8B H 0.2844 0.1888 0.3316 0.120 Uiso 1 1 calc R . .
H8C H 0.3330 0.1447 0.3786 0.120 Uiso 1 1 calc R . .
C9 C 0.27462(19) -0.0131(2) 0.4022(2) 0.1093(14) Uani 1 1 d . . .
H9A H 0.2590 0.0029 0.4482 0.164 Uiso 1 1 calc R . .
H9B H 0.3152 -0.0217 0.4115 0.164 Uiso 1 1 calc R . .
H9C H 0.2561 -0.0584 0.3850 0.164 Uiso 1 1 calc R . .
C10 C 0.18301(14) 0.0777(3) 0.3092(3) 0.1243(17) Uani 1 1 d . . .
H10A H 0.1670 0.0935 0.3551 0.186 Uiso 1 1 calc R . .
H10B H 0.1644 0.0327 0.2914 0.186 Uiso 1 1 calc R . .
H10C H 0.1771 0.1159 0.2715 0.186 Uiso 1 1 calc R . .
C11 C 0.41058(14) 0.11586(16) 0.01660(17) 0.0691(9) Uani 1 1 d . . .
H11A H 0.4181 0.1288 -0.0344 0.104 Uiso 1 1 calc R . .
H11B H 0.3741 0.1361 0.0281 0.104 Uiso 1 1 calc R . .
H11C H 0.4098 0.0626 0.0215 0.104 Uiso 1 1 calc R . .
C12 C 0.53731(13) 0.10804(18) 0.05770(17) 0.0702(9) Uani 1 1 d . . .
H12A H 0.5437 0.1198 0.0061 0.105 Uiso 1 1 calc R . .
H12B H 0.5333 0.0551 0.0630 0.105 Uiso 1 1 calc R . .
H12C H 0.5695 0.1250 0.0902 0.105 Uiso 1 1 calc R . .
C13 C 0.49894(15) 0.34891(17) 0.13376(18) 0.0764(10) Uani 1 1 d . . .
H13A H 0.4976 0.3994 0.1158 0.115 Uiso 1 1 calc R . .
H13B H 0.5380 0.3359 0.1496 0.115 Uiso 1 1 calc R . .
H13C H 0.4755 0.3442 0.1759 0.115 Uiso 1 1 calc R . .
C14 C 0.52191(19) 0.40260(19) -0.0797(2) 0.1107(14) Uani 1 1 d . . .
H14A H 0.5463 0.4107 -0.1204 0.166 Uiso 1 1 calc R . .
H14B H 0.5326 0.4363 -0.0390 0.166 Uiso 1 1 calc R . .
H14C H 0.4825 0.4112 -0.0975 0.166 Uiso 1 1 calc R . .
C15 C 0.51250(18) 0.2424(2) -0.12800(19) 0.1009(13) Uani 1 1 d . . .
H15A H 0.5381 0.2529 -0.1668 0.151 Uiso 1 1 calc R . .
H15B H 0.4735 0.2513 -0.1473 0.151 Uiso 1 1 calc R . .
H15C H 0.5168 0.1913 -0.1127 0.151 Uiso 1 1 calc R . .
C16 C 0.60770(15) 0.2885(3) -0.0119(3) 0.1324(18) Uani 1 1 d . . .
H16A H 0.6315 0.2969 -0.0531 0.199 Uiso 1 1 calc R . .
H16B H 0.6127 0.2382 0.0058 0.199 Uiso 1 1 calc R . .
H16C H 0.6186 0.3224 0.0286 0.199 Uiso 1 1 calc R . .
C17 C 0.32138(14) 0.2943(2) 0.0745(2) 0.0983(13) Uani 1 1 d . . .
H17A H 0.2845 0.3120 0.0544 0.147 Uiso 1 1 calc R . .
H17B H 0.3298 0.3144 0.1243 0.147 Uiso 1 1 calc R . .
H17C H 0.3207 0.2409 0.0772 0.147 Uiso 1 1 calc R . .
C18 C 0.35738(15) 0.2890(2) -0.0856(2) 0.0964(13) Uani 1 1 d . . .
H18A H 0.3194 0.3062 -0.1018 0.145 Uiso 1 1 calc R . .
H18B H 0.3578 0.2355 -0.0853 0.145 Uiso 1 1 calc R . .
H18C H 0.3843 0.3070 -0.1198 0.145 Uiso 1 1 calc R . .
C19 C 0.37686(14) 0.42895(18) 0.0085(2) 0.0892(12) Uani 1 1 d . . .
H19A H 0.3391 0.4458 -0.0091 0.134 Uiso 1 1 calc R . .
H19B H 0.4044 0.4462 -0.0252 0.134 Uiso 1 1 calc R . .
H19C H 0.3865 0.4483 0.0584 0.134 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
Si1 0.0381(4) 0.0481(5) 0.0352(4) -0.0004(4) 0.0004(3) 0.0003(3)
Si2 0.0385(4) 0.0482(5) 0.0458(5) 0.0011(4) -0.0019(3) -0.0001(4)
Si3 0.0399(4) 0.0589(6) 0.0497(5) 0.0062(4) -0.0021(4) -0.0030(4)
Si4 0.0656(6) 0.0713(7) 0.0618(6) 0.0077(5) -0.0087(5) -0.0222(5)
Si5 0.0533(5) 0.0818(7) 0.0673(6) -0.0014(5) 0.0171(4) -0.0034(5)
Si6 0.0524(5) 0.0514(5) 0.0355(4) -0.0012(4) 0.0001(4) 0.0032(4)
Si7 0.0521(5) 0.0523(5) 0.0419(5) 0.0016(4) -0.0009(4) -0.0016(4)
Si8 0.0695(6) 0.0785(7) 0.0670(6) 0.0169(5) 0.0171(5) 0.0034(5)
Si9 0.0558(5) 0.0578(6) 0.0731(6) 0.0012(5) -0.0036(4) 0.0075(4)
C1 0.0543(18) 0.065(2) 0.0466(17) -0.0012(15) 0.0004(14) 0.0076(15)
C2 0.060(2) 0.070(2) 0.074(2) 0.0205(18) -0.0155(16) -0.0135(16)
C3 0.067(2) 0.061(2) 0.074(2) -0.0145(18) 0.0098(17) -0.0035(17)
C4 0.0540(19) 0.077(2) 0.079(2) 0.0265(19) -0.0108(17) -0.0008(17)
C5 0.129(3) 0.064(3) 0.115(3) 0.018(2) -0.029(3) -0.017(2)
C6 0.118(3) 0.108(3) 0.073(3) -0.017(2) -0.005(2) -0.040(3)
C7 0.073(3) 0.132(4) 0.136(4) -0.008(3) 0.009(2) -0.048(2)
C8 0.078(2) 0.084(3) 0.081(3) -0.010(2) 0.0223(19) -0.0020(19)
C9 0.167(4) 0.095(3) 0.072(3) 0.010(2) 0.044(3) -0.011(3)
C10 0.059(2) 0.166(4) 0.150(4) -0.044(3) 0.027(2) 0.008(3)
C11 0.098(2) 0.058(2) 0.0479(19) -0.0013(15) -0.0206(17) -0.0028(18)
C12 0.083(2) 0.077(2) 0.052(2) 0.0039(17) 0.0185(17) 0.0218(18)
C13 0.102(3) 0.064(2) 0.062(2) -0.0024(17) -0.0096(19) -0.0153(19)
C14 0.138(4) 0.075(3) 0.126(4) 0.025(3) 0.056(3) -0.011(2)
C15 0.141(3) 0.101(3) 0.065(2) 0.008(2) 0.032(2) 0.032(3)
C16 0.060(2) 0.197(5) 0.142(4) 0.043(4) 0.023(3) -0.004(3)
C17 0.068(2) 0.096(3) 0.132(4) 0.009(3) 0.014(2) 0.012(2)
C18 0.092(3) 0.105(3) 0.086(3) -0.010(2) -0.034(2) 0.027(2)
C19 0.080(2) 0.065(2) 0.122(3) 0.008(2) 0.002(2) 0.0148(19)

_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
Si1 C1 1.895(3) .
Si1 Si6 2.3857(10) .
Si1 Si2 2.3942(11) .
Si1 Si1 2.4048(13) 2_655
Si2 C2 1.877(3) .
Si2 C3 1.887(3) .
Si2 Si3 2.3573(10) .
Si3 C4 1.893(3) .
Si3 Si5 2.3502(12) .
Si3 Si4 2.3685(12) .
Si4 C5 1.867(3) .
Si4 C6 1.867(4) .
Si4 C7 1.881(4) .
Si5 C9 1.863(4) .
Si5 C8 1.864(3) .
Si5 C10 1.875(4) .
Si6 C12 1.884(3) .
Si6 C11 1.899(3) .
Si6 Si7 2.3700(11) .
Si7 C13 1.900(3) .
Si7 Si8 2.3528(12) .
Si7 Si9 2.3532(11) .
Si8 C15 1.861(4) .
Si8 C16 1.873(4) .
Si8 C14 1.877(4) .
Si9 C18 1.862(3) .
Si9 C17 1.866(4) .
Si9 C19 1.879(3) .

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
C1 Si1 Si6 106.40(9) . .
C1 Si1 Si2 109.31(10) . .
Si6 Si1 Si2 109.89(4) . .
C1 Si1 Si1 107.13(9) . 2_655
Si6 Si1 Si1 109.22(5) . 2_655
Si2 Si1 Si1 114.54(3) . 2_655
C2 Si2 C3 106.11(15) . .
C2 Si2 Si3 106.78(10) . .
C3 Si2 Si3 104.71(10) . .
C2 Si2 Si1 112.17(9) . .
C3 Si2 Si1 109.48(10) . .
Si3 Si2 Si1 116.84(4) . .
C4 Si3 Si5 108.71(11) . .
C4 Si3 Si2 110.59(10) . .
Si5 Si3 Si2 116.28(4) . .
C4 Si3 Si4 106.51(10) . .
Si5 Si3 Si4 106.74(5) . .
Si2 Si3 Si4 107.51(4) . .
C5 Si4 C6 108.74(19) . .
C5 Si4 C7 107.97(19) . .
C6 Si4 C7 105.50(18) . .
C5 Si4 Si3 112.61(12) . .
C6 Si4 Si3 110.91(12) . .
C7 Si4 Si3 110.82(14) . .
C9 Si5 C8 108.18(17) . .
C9 Si5 C10 110.1(2) . .
C8 Si5 C10 105.08(17) . .
C9 Si5 Si3 109.82(13) . .
C8 Si5 Si3 114.64(11) . .
C10 Si5 Si3 108.85(14) . .
C12 Si6 C11 104.38(15) . .
C12 Si6 Si7 111.05(11) . .
C11 Si6 Si7 103.96(10) . .
C12 Si6 Si1 109.12(10) . .
C11 Si6 Si1 111.79(11) . .
Si7 Si6 Si1 115.86(4) . .
C13 Si7 Si8 105.58(11) . .
C13 Si7 Si9 108.01(11) . .
Si8 Si7 Si9 106.75(4) . .
C13 Si7 Si6 116.13(10) . .
Si8 Si7 Si6 109.59(4) . .
Si9 Si7 Si6 110.31(4) . .
C15 Si8 C16 108.2(2) . .
C15 Si8 C14 106.90(18) . .
C16 Si8 C14 108.6(2) . .
C15 Si8 Si7 113.01(13) . .
C16 Si8 Si7 110.38(14) . .
C14 Si8 Si7 109.64(13) . .
C18 Si9 C17 107.97(18) . .
C18 Si9 C19 108.20(18) . .
C17 Si9 C19 107.35(17) . .
C18 Si9 Si7 111.19(11) . .
C17 Si9 Si7 112.89(12) . .
C19 Si9 Si7 109.05(11) . .

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
Si6 Si1 Si1 C1 37.87(10) . . 2_655 2_655
Si6 Si1 Si1 Si2 -83.55(4) . . 2_655 2_655
Si6 Si1 Si1 Si6 152.72(6) . . 2_655 2_655
Si2 Si1 Si1 C1 161.59(10) . . 2_655 2_655
Si2 Si1 Si1 Si2 40.17(8) . . 2_655 2_655
Si2 Si1 Si1 Si6 -83.55(4) . . 2_655 2_655
C1 Si1 Si1 C1 -76.99(19) . . 2_655 2_655
C1 Si1 Si1 Si2 161.59(10) . . 2_655 2_655
C1 Si1 Si1 Si6 37.87(10) . . 2_655 2_655

_diffrn_measured_fraction_theta_max 0.993
_diffrn_reflns_theta_full        27.16
_diffrn_measured_fraction_theta_full 0.993
_refine_diff_density_max         0.330
_refine_diff_density_min         -0.201
_refine_diff_density_rms         0.053