#------------------------------------------------------------------------------ #$Date: 2011-08-07 10:16:04 +0300 (Sun, 07 Aug 2011) $ #$Revision: 23376 $ #$URL: file:///home/coder/svn-repositories/cod/cif/4/4323348.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_4323348 loop_ _publ_author_name 'Bernd Findeis' 'Lutz H. Gade' 'Ian J. Scowen' 'Mary McPartlin' _publ_section_title ; Ligand Exchange and Molecular Aggregation of an Ag-Sn Heterobimetallic Complex: First Structural Characterization of an Ag-Sn Bond ; _journal_name_full 'Inorganic Chemistry' _journal_page_first 960 _journal_page_last 961 _journal_volume 36 _journal_year 1997 _chemical_formula_moiety 'C28 H42 Ag N3 Si4 Sn' _chemical_formula_sum 'C56 H84 Ag2 N6 Si8 Sn2' _chemical_formula_weight 1519.14 _chemical_name_common Compound_4 _chemical_name_systematic ; ? ; _space_group_IT_number 2 _symmetry_cell_setting triclinic _symmetry_space_group_name_Hall '-P 1' _symmetry_space_group_name_H-M 'P -1' _atom_sites_solution_hydrogens geom _atom_sites_solution_primary direct _atom_sites_solution_secondary difmap _audit_creation_method SHELXL _cell_angle_alpha 74.582(7) _cell_angle_beta 70.088(11) _cell_angle_gamma 81.480(14) _cell_formula_units_Z 2 _cell_length_a 11.183(3) _cell_length_b 12.616(3) _cell_length_c 13.815(3) _cell_measurement_reflns_used 39 _cell_measurement_temperature 295(2) _cell_measurement_theta_max 12.54 _cell_measurement_theta_min 4.10 _cell_volume 1763.0(8) _computing_cell_refinement 'Siemens XSCANS' _computing_data_collection 'Siemens XSCANS' _computing_data_reduction 'Siemens SHELXTL' _computing_molecular_graphics 'Siemens SHELXTL' _computing_publication_material 'Siemens SHELXTL' _computing_structure_refinement 'SHELXL-93 (Sheldrick, 1993)' _computing_structure_solution 'SHELXS-86 (Sheldrick, 1990)' _diffrn_ambient_temperature 295(2) _diffrn_measurement_device 'Siemens P4' _diffrn_measurement_method '2\q/\w scans' _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 0.0211 _diffrn_reflns_av_sigmaI/netI 0.0422 _diffrn_reflns_limit_h_max 13 _diffrn_reflns_limit_h_min -1 _diffrn_reflns_limit_k_max 14 _diffrn_reflns_limit_k_min -14 _diffrn_reflns_limit_l_max 16 _diffrn_reflns_limit_l_min -15 _diffrn_reflns_number 7216 _diffrn_reflns_theta_max 25.00 _diffrn_reflns_theta_min 1.61 _diffrn_standards_decay_% 0 _diffrn_standards_interval_count 97 _diffrn_standards_number 3 _exptl_absorpt_coefficient_mu 1.420 _exptl_absorpt_correction_T_max 0.7142 _exptl_absorpt_correction_T_min 0.6091 _exptl_absorpt_correction_type empirical _exptl_crystal_colour pale_yellow _exptl_crystal_density_diffrn 1.431 _exptl_crystal_density_meas - _exptl_crystal_density_method n/a _exptl_crystal_description block _exptl_crystal_F_000 768 _exptl_crystal_size_max 0.32 _exptl_crystal_size_mid 0.40 _exptl_crystal_size_min 0.52 _refine_diff_density_max 1.128 _refine_diff_density_min -1.078 _refine_diff_density_rms 0.079 _refine_ls_extinction_method none _refine_ls_goodness_of_fit_all 1.020 _refine_ls_goodness_of_fit_obs 1.028 _refine_ls_matrix_type full _refine_ls_number_parameters 334 _refine_ls_number_reflns 6177 _refine_ls_number_restraints 0 _refine_ls_restrained_S_all 1.138 _refine_ls_restrained_S_obs 1.028 _refine_ls_R_factor_all 0.0688 _refine_ls_R_factor_obs 0.0389 _refine_ls_shift/esd_max 0.070 _refine_ls_shift/esd_mean 0.007 _refine_ls_structure_factor_coef Fsqd _refine_ls_weighting_scheme 'calc w=1/[\s^2^(Fo^2^)+(0.0428P)^2^+1.5074P] where P=(Fo^2^+2Fc^2^)/3' _refine_ls_wR_factor_all 0.1058 _refine_ls_wR_factor_obs 0.0811 _reflns_number_observed 4528 _reflns_number_total 6179 _reflns_observed_criterion >2sigma(I) _[local]_cod_data_source_file ic9611352.cif _[local]_cod_data_source_block IC9611352 _cod_original_cell_volume 1763.1(7) _cod_database_code 4323348 loop_ _symmetry_equiv_pos_as_xyz 'x, y, z' '-x, -y, -z' 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 Sn1 0.0473(2) 0.0308(2) 0.0300(2) -0.00029(12) -0.00311(14) -0.00882(14) Ag1 0.0867(4) 0.0328(2) 0.0912(4) 0.0026(2) -0.0170(3) -0.0096(2) Si1 0.0752(11) 0.0463(8) 0.0533(9) -0.0030(7) -0.0191(8) -0.0237(8) Si2 0.0579(10) 0.0414(8) 0.0398(7) 0.0050(6) -0.0053(7) -0.0015(7) Si3 0.0447(8) 0.0479(8) 0.0332(7) 0.0019(6) -0.0019(6) -0.0105(7) Si4 0.0616(10) 0.0370(7) 0.0415(7) 0.0075(6) -0.0070(7) -0.0167(7) N1 0.057(3) 0.039(2) 0.042(2) -0.001(2) -0.016(2) -0.013(2) N2 0.049(3) 0.041(2) 0.033(2) 0.000(2) -0.001(2) -0.002(2) N3 0.052(3) 0.043(2) 0.027(2) -0.005(2) 0.002(2) -0.014(2) C1 0.100(5) 0.052(4) 0.084(5) 0.021(3) -0.021(4) -0.032(4) C2 0.157(8) 0.060(4) 0.078(5) -0.026(4) -0.036(5) -0.013(5) C3 0.093(6) 0.106(6) 0.102(5) 0.002(4) -0.046(5) -0.047(5) C4 0.110(6) 0.054(4) 0.075(4) 0.001(3) -0.007(4) 0.014(4) C5 0.069(4) 0.101(5) 0.057(4) 0.005(3) -0.023(3) -0.001(4) C6 0.074(4) 0.076(4) 0.040(3) 0.006(3) -0.010(3) -0.010(3) C7 0.048(4) 0.075(4) 0.068(4) -0.008(3) -0.004(3) -0.015(3) C11 0.047(3) 0.061(3) 0.045(3) -0.001(3) -0.011(2) -0.008(3) C12 0.079(5) 0.093(5) 0.054(4) -0.008(3) -0.029(3) -0.010(4) C13 0.087(6) 0.142(8) 0.051(4) -0.010(4) -0.024(4) -0.022(5) C14 0.076(5) 0.132(8) 0.063(4) 0.018(5) -0.029(4) -0.007(5) C15 0.077(5) 0.081(5) 0.094(5) 0.019(4) -0.038(4) 0.009(4) C16 0.071(4) 0.063(4) 0.070(4) 0.000(3) -0.028(3) 0.004(3) C17 0.131(8) 0.211(11) 0.081(6) 0.038(6) -0.050(6) 0.010(8) C21 0.046(3) 0.030(2) 0.038(2) -0.006(2) -0.002(2) -0.004(2) C22 0.051(4) 0.073(4) 0.042(3) -0.007(3) -0.010(3) 0.000(3) C23 0.041(3) 0.086(5) 0.062(4) -0.009(3) -0.001(3) -0.003(3) C24 0.058(4) 0.067(4) 0.043(3) -0.013(3) 0.007(3) 0.002(3) C25 0.074(4) 0.041(3) 0.034(3) -0.008(2) -0.007(3) -0.002(3) C26 0.050(3) 0.031(2) 0.040(3) -0.006(2) -0.009(2) -0.001(2) C27 0.081(5) 0.161(8) 0.057(4) -0.013(5) 0.017(4) 0.000(5) C31 0.046(3) 0.043(3) 0.032(2) -0.002(2) -0.012(2) -0.004(2) C32 0.050(3) 0.047(3) 0.055(3) -0.010(2) -0.012(3) -0.008(3) C33 0.061(4) 0.065(4) 0.071(4) -0.001(3) -0.027(3) -0.016(3) C34 0.088(5) 0.048(3) 0.065(4) -0.007(3) -0.045(4) -0.006(3) C35 0.081(5) 0.065(4) 0.050(3) -0.025(3) -0.021(3) 0.010(3) C36 0.052(3) 0.066(4) 0.046(3) -0.019(3) -0.007(3) -0.005(3) C37 0.155(8) 0.059(4) 0.115(6) -0.011(4) -0.082(6) -0.022(5) 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 Sn1 Sn 0.87906(3) 0.84273(3) 0.65636(2) 0.03909(11) Uani 1 d . . Ag1 Ag 0.92785(5) 1.05332(3) 0.57281(4) 0.0759(2) Uani 1 d . . Si1 Si 0.7102(2) 0.63594(13) 0.67906(12) 0.0581(4) Uani 1 d . . Si2 Si 1.0039(2) 0.59634(12) 0.75734(11) 0.0521(4) Uani 1 d . . Si3 Si 0.71293(14) 0.73437(12) 0.91138(10) 0.0461(3) Uani 1 d . . Si4 Si 0.7800(2) 0.58689(11) 0.82887(11) 0.0510(4) Uani 1 d . . N1 N 0.7404(4) 0.7744(3) 0.6247(3) 0.0467(10) Uani 1 d . . N2 N 1.0165(4) 0.7082(3) 0.6499(3) 0.0462(10) Uani 1 d . . N3 N 0.8117(4) 0.8340(3) 0.8198(3) 0.0441(10) Uani 1 d . . C1 C 0.7179(7) 0.4508(5) 0.9171(5) 0.085(2) Uani 1 d . . H1A H 0.7489(7) 0.3940(5) 0.8785(5) 0.128 Uiso 1 calc R . H1B H 0.6264(7) 0.4564(5) 0.9398(5) 0.128 Uiso 1 calc R . H1C H 0.7468(7) 0.4329(5) 0.9778(5) 0.128 Uiso 1 calc R . C2 C 0.7979(8) 0.5389(5) 0.5909(5) 0.096(3) Uani 1 d . . H2A H 0.8880(8) 0.5459(5) 0.5706(5) 0.144 Uiso 1 calc R . H2B H 0.7717(8) 0.5571(5) 0.5288(5) 0.144 Uiso 1 calc R . H2C H 0.7786(8) 0.4645(5) 0.6285(5) 0.144 Uiso 1 calc R . C3 C 0.5351(7) 0.6177(6) 0.7149(6) 0.097(2) Uani 1 d . . H3A H 0.4869(7) 0.6658(6) 0.7600(6) 0.146 Uiso 1 calc R . H3B H 0.5179(7) 0.5426(6) 0.7514(6) 0.146 Uiso 1 calc R . H3C H 0.5113(7) 0.6353(6) 0.6516(6) 0.146 Uiso 1 calc R . C4 C 1.0854(7) 0.4694(5) 0.7107(5) 0.091(2) Uani 1 d . . H4A H 1.0480(7) 0.4555(5) 0.6625(5) 0.136 Uiso 1 calc R . H4B H 1.0755(7) 0.4075(5) 0.7704(5) 0.136 Uiso 1 calc R . H4C H 1.1744(7) 0.4801(5) 0.6754(5) 0.136 Uiso 1 calc R . C5 C 1.0811(6) 0.6183(6) 0.8514(5) 0.080(2) Uani 1 d . . H5A H 1.0416(6) 0.6828(6) 0.8769(5) 0.120 Uiso 1 calc R . H5B H 1.1702(6) 0.6279(6) 0.8153(5) 0.120 Uiso 1 calc R . H5C H 1.0709(6) 0.5554(6) 0.9101(5) 0.120 Uiso 1 calc R . C6 C 0.7435(6) 0.6997(5) 1.0425(4) 0.069(2) Uani 1 d . . H6A H 0.8321(6) 0.6778(5) 1.0323(4) 0.103 Uiso 1 calc R . H6B H 0.6927(6) 0.6404(5) 1.0897(4) 0.103 Uiso 1 calc R . H6C H 0.7214(6) 0.7632(5) 1.0724(4) 0.103 Uiso 1 calc R . C7 C 0.5387(5) 0.7763(5) 0.9372(5) 0.068(2) Uani 1 d . . H7A H 0.5196(5) 0.7946(5) 0.8718(5) 0.103 Uiso 1 calc R . H7B H 0.5180(5) 0.8393(5) 0.9678(5) 0.103 Uiso 1 calc R . H7C H 0.4894(5) 0.7165(5) 0.9852(5) 0.103 Uiso 1 calc R . C11 C 0.7079(5) 0.8401(5) 0.5344(4) 0.0535(13) Uani 1 d . . C12 C 0.7073(6) 0.7953(6) 0.4518(4) 0.074(2) Uani 1 d . . H12 H 0.7256(6) 0.7202(6) 0.4561(4) 0.089 Uiso 1 calc R . C13 C 0.6795(7) 0.8627(8) 0.3637(5) 0.094(2) Uani 1 d . . H13 H 0.6774(7) 0.8309(8) 0.3109(5) 0.112 Uiso 1 calc R . C14 C 0.6550(7) 0.9748(8) 0.3516(6) 0.097(3) Uani 1 d . . C15 C 0.6528(7) 1.0181(6) 0.4322(6) 0.090(2) Uani 1 d . . H15 H 0.6340(7) 1.0933(6) 0.4268(6) 0.108 Uiso 1 calc R . C16 C 0.6781(6) 0.9526(5) 0.5237(5) 0.070(2) Uani 1 d . . H16 H 0.6749(6) 0.9851(5) 0.5777(5) 0.084 Uiso 1 calc R . C17 C 0.6244(9) 1.0457(9) 0.2535(6) 0.153(4) Uani 1 d . . H17A H 0.6312(9) 1.0005(9) 0.2057(6) 0.230 Uiso 1 calc R . H17B H 0.6835(9) 1.1025(9) 0.2192(6) 0.230 Uiso 1 calc R . H17C H 0.5393(9) 1.0787(9) 0.2742(6) 0.230 Uiso 1 calc R . C21 C 1.1154(5) 0.7207(4) 0.5516(3) 0.0411(11) Uani 1 d . . C22 C 1.2440(5) 0.7064(5) 0.5428(4) 0.0579(14) Uani 1 d . . H22 H 1.2674(5) 0.6843(5) 0.6040(4) 0.070 Uiso 1 calc R . C23 C 1.3381(6) 0.7241(5) 0.4453(5) 0.068(2) Uani 1 d . . H23 H 1.4230(6) 0.7118(5) 0.4431(5) 0.082 Uiso 1 calc R . C24 C 1.3105(6) 0.7593(5) 0.3514(4) 0.062(2) Uani 1 d . . C25 C 1.1838(6) 0.7728(4) 0.3577(4) 0.0524(14) Uani 1 d . . H25 H 1.1623(6) 0.7965(4) 0.2957(4) 0.063 Uiso 1 calc R . C26 C 1.0856(5) 0.7518(4) 0.4557(3) 0.0428(11) Uani 1 d . . H26 H 1.0011(5) 0.7583(4) 0.4573(3) 0.051 Uiso 1 calc R . C27 C 1.4148(7) 0.7809(7) 0.2447(5) 0.114(3) Uani 1 d . . H27A H 1.4967(7) 0.7676(7) 0.2554(5) 0.171 Uiso 1 calc R . H27B H 1.4052(7) 0.8561(7) 0.2077(5) 0.171 Uiso 1 calc R . H27C H 1.4084(7) 0.7327(7) 0.2036(5) 0.171 Uiso 1 calc R . C31 C 0.8472(5) 0.9229(4) 0.8469(3) 0.0415(11) Uani 1 d . . C32 C 0.9715(5) 0.9566(4) 0.8052(4) 0.0517(13) Uani 1 d . . H32 H 1.0326(5) 0.9203(4) 0.7580(4) 0.062 Uiso 1 calc R . C33 C 1.0061(6) 1.0429(5) 0.8326(5) 0.065(2) Uani 1 d . . H33 H 1.0894(6) 1.0643(5) 0.8017(5) 0.078 Uiso 1 calc R . C34 C 0.9205(7) 1.0982(5) 0.9044(5) 0.063(2) Uani 1 d . . C35 C 0.7979(6) 1.0662(5) 0.9447(4) 0.064(2) Uani 1 d . . H35 H 0.7378(6) 1.1024(5) 0.9926(4) 0.077 Uiso 1 calc R . C36 C 0.7602(5) 0.9822(5) 0.9168(4) 0.0555(14) Uani 1 d . . H36 H 0.6754(5) 0.9646(5) 0.9450(4) 0.067 Uiso 1 calc R . C37 C 0.9614(8) 1.1893(5) 0.9372(6) 0.099(3) Uani 1 d . . H37A H 1.0504(8) 1.1994(5) 0.9006(6) 0.149 Uiso 1 calc R . H37B H 0.9472(8) 1.1694(5) 1.0121(6) 0.149 Uiso 1 calc R . H37C H 0.9127(8) 1.2566(5) 0.9196(6) 0.149 Uiso 1 calc R . 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' Ag Ag -0.8971 1.1015 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' Sn Sn -0.6537 1.4246 '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 N1 Sn1 N3 105.7(2) . . ? N1 Sn1 N2 98.4(2) . . ? N3 Sn1 N2 100.63(15) . . ? N1 Sn1 Ag1 120.52(11) . . ? N3 Sn1 Ag1 103.16(10) . . ? N2 Sn1 Ag1 125.53(11) . . ? N1 Sn1 Ag1 105.00(11) . 2_776 ? N3 Sn1 Ag1 148.14(11) . 2_776 ? N2 Sn1 Ag1 83.21(10) . 2_776 ? Ag1 Sn1 Ag1 52.62(2) . 2_776 ? C26 Ag1 C25 32.50(15) 2_776 2_776 ? C26 Ag1 Ag1 122.95(11) 2_776 2_776 ? C25 Ag1 Ag1 154.83(11) 2_776 2_776 ? C26 Ag1 Sn1 161.92(11) 2_776 . ? C25 Ag1 Sn1 129.47(11) 2_776 . ? Ag1 Ag1 Sn1 74.70(2) 2_776 . ? C26 Ag1 Sn1 70.39(11) 2_776 2_776 ? C25 Ag1 Sn1 102.80(11) 2_776 2_776 ? Ag1 Ag1 Sn1 52.68(2) 2_776 2_776 ? Sn1 Ag1 Sn1 127.38(2) . 2_776 ? N1 Si1 C3 110.0(3) . . ? N1 Si1 C2 115.4(3) . . ? C3 Si1 C2 106.8(4) . . ? N1 Si1 Si4 105.22(15) . . ? C3 Si1 Si4 112.0(2) . . ? C2 Si1 Si4 107.5(2) . . ? N2 Si2 C4 110.1(2) . . ? N2 Si2 C5 112.0(3) . . ? C4 Si2 C5 107.3(3) . . ? N2 Si2 Si4 101.0(2) . . ? C4 Si2 Si4 112.4(3) . . ? C5 Si2 Si4 114.1(2) . . ? N3 Si3 C7 113.5(2) . . ? N3 Si3 C6 111.3(2) . . ? C7 Si3 C6 107.2(3) . . ? N3 Si3 Si4 100.51(14) . . ? C7 Si3 Si4 113.5(2) . . ? C6 Si3 Si4 110.9(2) . . ? C1 Si4 Si3 113.8(2) . . ? C1 Si4 Si1 111.0(2) . . ? Si3 Si4 Si1 106.00(8) . . ? C1 Si4 Si2 117.0(2) . . ? Si3 Si4 Si2 103.96(8) . . ? Si1 Si4 Si2 104.01(8) . . ? C11 N1 Si1 124.6(3) . . ? C11 N1 Sn1 112.6(3) . . ? Si1 N1 Sn1 120.1(2) . . ? C21 N2 Si2 125.6(3) . . ? C21 N2 Sn1 113.1(3) . . ? Si2 N2 Sn1 121.3(2) . . ? C31 N3 Si3 123.2(3) . . ? C31 N3 Sn1 113.0(3) . . ? Si3 N3 Sn1 123.6(2) . . ? C16 C11 C12 117.0(5) . . ? C16 C11 N1 120.8(5) . . ? C12 C11 N1 122.1(5) . . ? C13 C12 C11 120.3(7) . . ? C14 C13 C12 122.5(7) . . ? C15 C14 C13 117.3(7) . . ? C15 C14 C17 121.8(9) . . ? C13 C14 C17 120.8(9) . . ? C14 C15 C16 122.0(7) . . ? C11 C16 C15 120.7(6) . . ? C22 C21 C26 116.5(4) . . ? C22 C21 N2 123.3(5) . . ? C26 C21 N2 120.1(5) . . ? C23 C22 C21 121.7(5) . . ? C22 C23 C24 122.3(6) . . ? C25 C24 C23 117.2(5) . . ? C25 C24 C27 120.9(6) . . ? C23 C24 C27 121.9(6) . . ? C24 C25 C26 121.8(5) . . ? C24 C25 Ag1 111.7(4) . 2_776 ? C26 C25 Ag1 64.8(3) . 2_776 ? C21 C26 C25 120.2(5) . . ? C21 C26 Ag1 100.5(3) . 2_776 ? C25 C26 Ag1 82.7(3) . 2_776 ? C32 C31 C36 115.9(5) . . ? C32 C31 N3 121.7(4) . . ? C36 C31 N3 122.4(4) . . ? C33 C32 C31 121.5(5) . . ? C32 C33 C34 121.9(6) . . ? C35 C34 C33 116.7(5) . . ? C35 C34 C37 122.0(6) . . ? C33 C34 C37 121.3(6) . . ? C34 C35 C36 122.4(5) . . ? C35 C36 C31 121.4(5) . . ? 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 Sn1 N1 2.097(4) . ? Sn1 N3 2.100(3) . ? Sn1 N2 2.112(4) . ? Sn1 Ag1 2.6567(7) . ? Sn1 Ag1 3.2220(9) 2_776 ? Ag1 C26 2.375(4) 2_776 ? Ag1 C25 2.604(5) 2_776 ? Ag1 Ag1 2.6544(11) 2_776 ? Ag1 Sn1 3.2220(9) 2_776 ? Si1 N1 1.741(4) . ? Si1 C3 1.883(7) . ? Si1 C2 1.889(6) . ? Si1 Si4 2.356(2) . ? Si2 N2 1.737(4) . ? Si2 C4 1.878(6) . ? Si2 C5 1.881(6) . ? Si2 Si4 2.367(2) . ? Si3 N3 1.737(4) . ? Si3 C7 1.878(6) . ? Si3 C6 1.883(5) . ? Si3 Si4 2.336(2) . ? Si4 C1 1.892(5) . ? N1 C11 1.431(6) . ? N2 C21 1.417(6) . ? N3 C31 1.418(6) . ? C11 C16 1.389(8) . ? C11 C12 1.402(8) . ? C12 C13 1.390(9) . ? C13 C14 1.375(11) . ? C14 C15 1.356(11) . ? C14 C17 1.527(9) . ? C15 C16 1.408(8) . ? C21 C22 1.390(7) . ? C21 C26 1.416(6) . ? C22 C23 1.383(7) . ? C23 C24 1.379(8) . ? C24 C25 1.378(8) . ? C24 C27 1.523(8) . ? C25 C26 1.411(7) . ? C25 Ag1 2.604(5) 2_776 ? C26 Ag1 2.375(4) 2_776 ? C31 C32 1.394(7) . ? C31 C36 1.402(7) . ? C32 C33 1.386(7) . ? C33 C34 1.382(8) . ? C34 C35 1.370(8) . ? C34 C37 1.520(8) . ? C35 C36 1.381(7) . ?