#------------------------------------------------------------------------------
#$Date: 2016-03-25 12:46:24 +0200 (Fri, 25 Mar 2016) $
#$Revision: 179814 $
#$URL: svn://www.crystallography.net/cod/cif/7/01/10/7011037.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_7011037
loop_
_publ_author_name
'Jian-Feng Li'
'Lin-Hong Weng'
'Xue-Hong Wei'
'Dian-Sheng Liu'
_publ_section_title
;
 Synthesis and structures of novel chiral lithium amidinates and mono-
 and di-lithium (1R,2R)-(−)-1,2-(NHSiMe3)2C6H10
;
_journal_issue                   7
_journal_name_full               'J. Chem. Soc., Dalton Trans.'
_journal_page_first              1401
_journal_page_last               1405
_journal_paper_doi               10.1039/b106992f
_journal_year                    2002
_chemical_formula_sum            'C24 H54 Li2 N4 Si4'
_chemical_formula_weight         524.95
_chemical_name_systematic
; 
? 
;
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 1'
_atom_sites_solution_hydrogens   mixed
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 103.643(5)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   9.778(3)
_cell_length_b                   18.113(5)
_cell_length_c                   10.387(3)
_cell_measurement_reflns_used    892
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      20.075
_cell_measurement_theta_min      2.425
_cell_volume                     1787.7(9)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      298(2)
_diffrn_measured_fraction_theta_full 0.989
_diffrn_measured_fraction_theta_max 0.989
_diffrn_measurement_device_type  'ccd area detector'
_diffrn_measurement_method       ω
_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  0.0287
_diffrn_reflns_av_sigmaI/netI    0.0721
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       22
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            8423
_diffrn_reflns_theta_full        26.39
_diffrn_reflns_theta_max         26.39
_diffrn_reflns_theta_min         2.02
_diffrn_standards_decay_%        2.97
_exptl_absorpt_coefficient_mu    0.183
_exptl_absorpt_correction_T_max  0.9855
_exptl_absorpt_correction_T_min  0.9062
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_density_diffrn    0.975
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             576
_exptl_crystal_size_max          0.55
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.305
_refine_diff_density_min         -0.173
_refine_diff_density_rms         0.038
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.09(14)
_refine_ls_extinction_coef       0.0030(13)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc²λ³/sin(2θ)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   0.913
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     316
_refine_ls_number_reflns         6875
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.913
_refine_ls_R_factor_all          0.1137
_refine_ls_R_factor_gt           0.0570
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[σ²(Fo²)+(0.0804P)²+0.0000P] where P=(Fo²+2Fc²)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1294
_refine_ls_wR_factor_ref         0.1525
_reflns_number_gt                3748
_reflns_number_total             6875
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b106992f.txt
_cod_data_source_block           compound2
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 
;
_cod_original_cell_volume        1787.7(8)
_cod_original_sg_symbol_H-M      'P2(1)   '
_cod_database_code               7011037
loop_
_symmetry_equiv_pos_as_xyz
'x, y, z'
'-x, y+1/2, -z'
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
Li1 Li 0.7834(7) 0.8663(4) 0.3968(7) 0.0650(18) Uani 1 1 d . . .
Li2 Li 0.8471(7) 0.7536(4) 0.3123(6) 0.0654(17) Uani 1 1 d . . .
N1 N 0.8677(3) 0.77769(17) 0.5024(3) 0.0542(8) Uani 1 1 d . . .
N2 N 0.6986(4) 0.9019(2) 0.5484(4) 0.0631(9) Uani 1 1 d . . .
N3 N 0.7523(4) 0.84079(18) 0.2067(3) 0.0619(9) Uani 1 1 d . . .
N4 N 0.7706(4) 0.6868(2) 0.1441(4) 0.0668(10) Uani 1 1 d . . .
C1 C 0.7796(4) 0.7731(2) 0.5993(4) 0.0556(9) Uani 1 1 d . . .
C2 C 0.7230(5) 0.6941(2) 0.6089(4) 0.0688(12) Uani 1 1 d . . .
H2A H 0.6639 0.6800 0.5237 0.083 Uiso 1 1 calc R . .
H2B H 0.8014 0.6599 0.6301 0.083 Uiso 1 1 calc R . .
C3 C 0.6391(5) 0.6886(3) 0.7131(5) 0.0845(14) Uani 1 1 d . . .
H3A H 0.6049 0.6385 0.7158 0.101 Uiso 1 1 calc R . .
H3B H 0.6996 0.6998 0.7992 0.101 Uiso 1 1 calc R . .
C4 C 0.5166(5) 0.7411(3) 0.6849(5) 0.0914(16) Uani 1 1 d . . .
H4A H 0.4677 0.7386 0.7558 0.110 Uiso 1 1 calc R . .
H4B H 0.4511 0.7269 0.6031 0.110 Uiso 1 1 calc R . .
C5 C 0.5672(5) 0.8195(3) 0.6727(5) 0.0783(14) Uani 1 1 d . . .
H5A H 0.6259 0.8349 0.7573 0.094 Uiso 1 1 calc R . .
H5B H 0.4866 0.8523 0.6511 0.094 Uiso 1 1 calc R . .
C6 C 0.6507(4) 0.8261(2) 0.5665(4) 0.0559(10) Uani 1 1 d . . .
C7 C 1.1210(6) 0.8571(3) 0.6603(6) 0.0982(17) Uani 1 1 d . . .
H7A H 1.1828 0.8433 0.7431 0.147 Uiso 1 1 calc R . .
H7B H 1.0466 0.8876 0.6767 0.147 Uiso 1 1 calc R . .
H7C H 1.1730 0.8839 0.6080 0.147 Uiso 1 1 calc R . .
C8 C 1.0997(5) 0.6957(3) 0.6902(5) 0.0916(16) Uani 1 1 d . . .
H8A H 1.1640 0.7144 0.7679 0.137 Uiso 1 1 calc R . .
H8B H 1.1453 0.6578 0.6508 0.137 Uiso 1 1 calc R . .
H8C H 1.0186 0.6754 0.7144 0.137 Uiso 1 1 calc R . .
C9 C 1.1326(4) 0.7577(3) 0.4286(4) 0.0904(15) Uani 1 1 d . . .
H9A H 1.2329 0.7589 0.4621 0.136 Uiso 1 1 calc R . .
H9B H 1.1049 0.7962 0.3642 0.136 Uiso 1 1 calc R . .
H9C H 1.1053 0.7107 0.3879 0.136 Uiso 1 1 calc R . .
C10 C 0.5683(8) 1.0257(5) 0.6768(7) 0.163(3) Uani 1 1 d . . .
H10A H 0.6587 1.0387 0.7315 0.244 Uiso 1 1 calc R . .
H10B H 0.5221 0.9919 0.7238 0.244 Uiso 1 1 calc R . .
H10C H 0.5120 1.0694 0.6551 0.244 Uiso 1 1 calc R . .
C11 C 0.4148(5) 0.9569(3) 0.4140(5) 0.0961(17) Uani 1 1 d . . .
H11A H 0.3700 0.9213 0.4589 0.144 Uiso 1 1 calc R . .
H11B H 0.4258 0.9365 0.3318 0.144 Uiso 1 1 calc R . .
H11C H 0.3577 1.0006 0.3967 0.144 Uiso 1 1 calc R . .
C12 C 0.6881(8) 1.0485(4) 0.4425(11) 0.189(4) Uani 1 1 d . . .
H12A H 0.7776 1.0588 0.5012 0.284 Uiso 1 1 calc R . .
H12B H 0.6344 1.0933 0.4245 0.284 Uiso 1 1 calc R . .
H12C H 0.7023 1.0285 0.3611 0.284 Uiso 1 1 calc R . .
C13 C 0.6313(4) 0.8022(2) 0.1227(4) 0.0618(11) Uani 1 1 d . . .
C14 C 0.4908(5) 0.8347(3) 0.1374(5) 0.0782(14) Uani 1 1 d . . .
H14A H 0.4868 0.8864 0.1129 0.094 Uiso 1 1 calc R . .
H14B H 0.4864 0.8316 0.2295 0.094 Uiso 1 1 calc R . .
C15 C 0.3630(5) 0.7947(4) 0.0515(6) 0.1046(18) Uani 1 1 d . . .
H15A H 0.2772 0.8152 0.0683 0.125 Uiso 1 1 calc R . .
H15B H 0.3610 0.8021 -0.0414 0.125 Uiso 1 1 calc R . .
C16 C 0.3702(5) 0.7139(4) 0.0823(6) 0.0990(18) Uani 1 1 d . . .
H16A H 0.2915 0.6892 0.0236 0.119 Uiso 1 1 calc R . .
H16B H 0.3612 0.7067 0.1724 0.119 Uiso 1 1 calc R . .
C17 C 0.5062(5) 0.6786(3) 0.0670(4) 0.0768(13) Uani 1 1 d . . .
H17A H 0.5116 0.6812 -0.0249 0.092 Uiso 1 1 calc R . .
H17B H 0.5075 0.6269 0.0920 0.092 Uiso 1 1 calc R . .
C18 C 0.6354(4) 0.7187(2) 0.1557(4) 0.0588(11) Uani 1 1 d . . .
C19 C 0.7178(7) 0.9758(4) 0.0370(8) 0.153(3) Uani 1 1 d . . .
H19A H 0.7429 0.9845 -0.0457 0.229 Uiso 1 1 calc R . .
H19B H 0.7270 1.0208 0.0870 0.229 Uiso 1 1 calc R . .
H19C H 0.6222 0.9588 0.0201 0.229 Uiso 1 1 calc R . .
C20 C 0.9329(7) 0.8615(4) 0.0141(7) 0.146(3) Uani 1 1 d . . .
H20A H 0.9244 0.8933 -0.0612 0.219 Uiso 1 1 calc R . .
H20B H 0.8922 0.8143 -0.0146 0.219 Uiso 1 1 calc R . .
H20C H 1.0305 0.8553 0.0569 0.219 Uiso 1 1 calc R . .
C21 C 0.9730(6) 0.9512(3) 0.2664(6) 0.116(2) Uani 1 1 d . . .
H21A H 1.0351 0.9794 0.2263 0.174 Uiso 1 1 calc R . .
H21B H 1.0262 0.9150 0.3249 0.174 Uiso 1 1 calc R . .
H21C H 0.9267 0.9836 0.3157 0.174 Uiso 1 1 calc R . .
C22 C 1.0071(7) 0.5997(4) 0.1283(9) 0.163(3) Uani 1 1 d . . .
H22A H 1.0637 0.6350 0.1864 0.244 Uiso 1 1 calc R . .
H22B H 1.0003 0.6139 0.0379 0.244 Uiso 1 1 calc R . .
H22C H 1.0497 0.5518 0.1438 0.244 Uiso 1 1 calc R . .
C23 C 0.7242(7) 0.5274(3) 0.0458(7) 0.136(3) Uani 1 1 d . . .
H23A H 0.6321 0.5234 0.0629 0.204 Uiso 1 1 calc R . .
H23B H 0.7703 0.4803 0.0598 0.204 Uiso 1 1 calc R . .
H23C H 0.7158 0.5427 -0.0442 0.204 Uiso 1 1 calc R . .
C24 C 0.8373(8) 0.5704(3) 0.3343(6) 0.138(3) Uani 1 1 d . . .
H24A H 0.7435 0.5678 0.3477 0.207 Uiso 1 1 calc R . .
H24B H 0.8902 0.6067 0.3929 0.207 Uiso 1 1 calc R . .
H24C H 0.8821 0.5232 0.3525 0.207 Uiso 1 1 calc R . .
Si1 Si 1.04405(11) 0.77214(6) 0.56911(11) 0.0614(3) Uani 1 1 d . . .
Si2 Si 0.59194(15) 0.98114(7) 0.52065(15) 0.0810(4) Uani 1 1 d . . .
Si3 Si 0.83780(16) 0.90362(8) 0.13370(14) 0.0833(4) Uani 1 1 d . . .
Si4 Si 0.82952(16) 0.59680(8) 0.16034(15) 0.0876(5) Uani 1 1 d . . .
H2 H 0.765(5) 0.914(3) 0.605(4) 0.073(16) Uiso 1 1 d . . .
H4 H 0.802(5) 0.707(3) 0.090(5) 0.079(18) Uiso 1 1 d . . .
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'
Li Li -0.0003 0.0001 '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'
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
N3 Li1 N1 107.7(3) . . ?
N3 Li1 N2 147.6(4) . . ?
N1 Li1 N2 91.2(3) . . ?
N3 Li1 Li2 54.5(2) . . ?
N1 Li1 Li2 53.3(2) . . ?
N2 Li1 Li2 138.3(4) . . ?
N3 Li1 C6 130.1(4) . . ?
N1 Li1 C6 66.5(2) . . ?
N2 Li1 C6 35.72(18) . . ?
Li2 Li1 C6 103.5(3) . . ?
N3 Li1 C1 127.0(3) . . ?
N1 Li1 C1 32.37(15) . . ?
N2 Li1 C1 61.1(2) . . ?
Li2 Li1 C1 78.6(3) . . ?
C6 Li1 C1 34.39(15) . . ?
N3 Li1 Si3 32.64(15) . . ?
N1 Li1 Si3 122.9(3) . . ?
N2 Li1 Si3 145.6(3) . . ?
Li2 Li1 Si3 74.7(3) . . ?
C6 Li1 Si3 159.3(3) . . ?
C1 Li1 Si3 153.2(3) . . ?
N1 Li2 N3 107.1(3) . . ?
N1 Li2 N4 151.9(4) . . ?
N3 Li2 N4 88.3(3) . . ?
N1 Li2 Li1 54.2(3) . . ?
N3 Li2 Li1 53.0(3) . . ?
N4 Li2 Li1 136.8(4) . . ?
N1 Li2 C18 127.0(3) . . ?
N3 Li2 C18 68.0(2) . . ?
N4 Li2 C18 37.49(18) . . ?
Li1 Li2 C18 102.7(3) . . ?
N1 Li2 C13 122.5(3) . . ?
N3 Li2 C13 32.91(17) . . ?
N4 Li2 C13 61.0(2) . . ?
Li1 Li2 C13 76.0(3) . . ?
C18 Li2 C13 35.08(15) . . ?
N1 Li2 C9 72.8(2) . . ?
N3 Li2 C9 120.2(4) . . ?
N4 Li2 C9 120.0(3) . . ?
Li1 Li2 C9 98.1(3) . . ?
C18 Li2 C9 157.5(3) . . ?
C13 Li2 C9 148.4(3) . . ?
N1 Li2 Si1 34.43(14) . . ?
N3 Li2 Si1 121.8(3) . . ?
N4 Li2 Si1 148.3(3) . . ?
Li1 Li2 Si1 74.7(3) . . ?
C18 Li2 Si1 158.3(3) . . ?
C13 Li2 Si1 150.7(3) . . ?
C9 Li2 Si1 38.55(13) . . ?
C1 N1 Si1 114.7(2) . . ?
C1 N1 Li2 136.7(3) . . ?
Si1 N1 Li2 104.3(2) . . ?
C1 N1 Li1 100.8(3) . . ?
Si1 N1 Li1 121.0(3) . . ?
Li2 N1 Li1 72.5(3) . . ?
C6 N2 Si2 125.9(3) . . ?
C6 N2 Li1 90.2(3) . . ?
Si2 N2 Li1 117.6(3) . . ?
C13 N3 Si3 117.8(3) . . ?
C13 N3 Li1 128.0(3) . . ?
Si3 N3 Li1 108.3(3) . . ?
C13 N3 Li2 98.8(3) . . ?
Si3 N3 Li2 123.8(3) . . ?
Li1 N3 Li2 72.4(3) . . ?
C18 N4 Si4 130.4(3) . . ?
C18 N4 Li2 81.8(3) . . ?
Si4 N4 Li2 114.6(3) . . ?
N1 C1 C2 111.9(3) . . ?
N1 C1 C6 112.9(3) . . ?
C2 C1 C6 107.5(3) . . ?
N1 C1 Li1 46.8(2) . . ?
C2 C1 Li1 134.4(3) . . ?
C6 C1 Li1 66.6(2) . . ?
C3 C2 C1 111.8(4) . . ?
C4 C3 C2 111.2(4) . . ?
C3 C4 C5 110.3(4) . . ?
C4 C5 C6 111.9(4) . . ?
N2 C6 C5 113.8(3) . . ?
N2 C6 C1 109.7(3) . . ?
C5 C6 C1 109.7(3) . . ?
N2 C6 Li1 54.1(2) . . ?
C5 C6 Li1 167.7(3) . . ?
C1 C6 Li1 79.0(2) . . ?
Si1 C9 Li2 74.99(19) . . ?
N3 C13 C14 111.9(4) . . ?
N3 C13 C18 110.9(3) . . ?
C14 C13 C18 109.2(4) . . ?
N3 C13 Li2 48.3(2) . . ?
C14 C13 Li2 128.5(3) . . ?
C18 C13 Li2 62.7(3) . . ?
C13 C14 C15 112.8(4) . . ?
C16 C15 C14 110.3(5) . . ?
C15 C16 C17 112.9(5) . . ?
C16 C17 C18 110.5(4) . . ?
N4 C18 C13 109.9(3) . . ?
N4 C18 C17 112.8(4) . . ?
C13 C18 C17 110.5(4) . . ?
N4 C18 Li2 60.7(3) . . ?
C13 C18 Li2 82.3(3) . . ?
C17 C18 Li2 167.3(4) . . ?
N1 Si1 C8 115.16(19) . . ?
N1 Si1 C7 113.9(2) . . ?
C8 Si1 C7 104.5(2) . . ?
N1 Si1 C9 107.43(17) . . ?
C8 Si1 C9 107.8(2) . . ?
C7 Si1 C9 107.7(3) . . ?
N1 Si1 Li2 41.24(16) . . ?
C8 Si1 Li2 123.8(2) . . ?
C7 Si1 Li2 131.1(2) . . ?
C9 Si1 Li2 66.46(19) . . ?
N2 Si2 C12 105.6(2) . . ?
N2 Si2 C10 113.5(3) . . ?
C12 Si2 C10 106.0(5) . . ?
N2 Si2 C11 109.6(2) . . ?
C12 Si2 C11 113.0(4) . . ?
C10 Si2 C11 109.1(3) . . ?
N3 Si3 C21 108.4(2) . . ?
N3 Si3 C20 113.3(3) . . ?
C21 Si3 C20 107.4(3) . . ?
N3 Si3 C19 113.2(2) . . ?
C21 Si3 C19 108.4(3) . . ?
C20 Si3 C19 105.8(4) . . ?
N3 Si3 Li1 39.10(18) . . ?
C21 Si3 Li1 71.2(2) . . ?
C20 Si3 Li1 137.4(3) . . ?
C19 Si3 Li1 115.0(3) . . ?
N4 Si4 C22 105.2(3) . . ?
N4 Si4 C24 106.0(3) . . ?
C22 Si4 C24 111.1(4) . . ?
N4 Si4 C23 117.0(3) . . ?
C22 Si4 C23 107.8(3) . . ?
C24 Si4 C23 109.7(3) . . ?
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
Li1 N3 1.980(8) . ?
Li1 N1 2.008(7) . ?
Li1 N2 2.050(8) . ?
Li1 Li2 2.363(10) . ?
Li1 C6 2.530(8) . ?
Li1 C1 2.705(8) . ?
Li1 Si3 2.982(7) . ?
Li2 N1 1.985(7) . ?
Li2 N3 2.019(8) . ?
Li2 N4 2.112(8) . ?
Li2 C18 2.397(8) . ?
Li2 C13 2.673(7) . ?
Li2 C9 2.769(8) . ?
Li2 Si1 2.918(6) . ?
N1 C1 1.474(4) . ?
N1 Si1 1.703(3) . ?
N2 C6 1.477(5) . ?
N2 Si2 1.757(4) . ?
N3 C13 1.470(5) . ?
N3 Si3 1.694(4) . ?
N4 C18 1.474(5) . ?
N4 Si4 1.724(4) . ?
C1 C2 1.545(6) . ?
C1 C6 1.556(5) . ?
C2 C3 1.508(6) . ?
C3 C4 1.503(7) . ?
C4 C5 1.519(7) . ?
C5 C6 1.525(6) . ?
C7 Si1 1.869(5) . ?
C8 Si1 1.864(5) . ?
C9 Si1 1.883(5) . ?
C10 Si2 1.874(7) . ?
C11 Si2 1.875(5) . ?
C12 Si2 1.841(7) . ?
C13 C14 1.534(6) . ?
C13 C18 1.550(6) . ?
C14 C15 1.535(7) . ?
C15 C16 1.496(7) . ?
C16 C17 1.517(7) . ?
C17 C18 1.556(6) . ?
C19 Si3 1.881(6) . ?
C20 Si3 1.880(7) . ?
C21 Si3 1.879(6) . ?
C22 Si4 1.844(6) . ?
C23 Si4 1.865(6) . ?
C24 Si4 1.853(6) . ?
