Supplementary Material (ESI) for Chemical Communications This journal is © The Royal Society of Chemistry 2001 data_may2400 _database_code_CSD 162978 _journal_coden_Cambridge 182 _publ_requested_journal 'Chemical Communications' loop_ _publ_author_name 'Eisenstein, Odile' 'Hitchcock, P. B.' 'Hulkes, A. G.' 'Lappert, M.' 'Maron, Lauren' _publ_contact_author_name 'Prof M Lappert' _publ_contact_author_address ; Prof M Lappert School of Chemistry & Molecular Science University of Sussex BRIGHTON BN1 9QJ U.K. ; _publ_contact_author_email 'M.F.LAPPERT@SUSSEX.AC.UK' _audit_creation_date 2000-05-16T14:19:43-00:00 _audit_creation_method 'WinGX routine CIF_UPDATE' _audit_conform_dict_name cif_core.dic _audit_conform_dict_version 2.1beta5 _audit_conform_dict_location ftp://ftp.iucr.org/cifdics/cif_core_2.1beta5.dic _publ_requested_category FM #----------------------------------------------------------------------------# # CHEMICAL INFORMATION # #----------------------------------------------------------------------------# _chemical_name_systematic ; ? ; _chemical_name_common '[CeCl{N(SiMe3)2}3]' _chemical_formula_moiety 'C18 H54 Ce Cl N3 Si6' _chemical_formula_structural 'C18 H54 Ce Cl N3 Si6' _chemical_formula_sum 'C18 H54 Ce Cl N3 Si6' _chemical_formula_weight 656.75 _chemical_compound_source 'synthesis as described' #----------------------------------------------------------------------------# # UNIT CELL INFORMATION # #----------------------------------------------------------------------------# _symmetry_cell_setting hexagonal _symmetry_space_group_name_H-M R3c _symmetry_space_group_name_Hall 'R 3 -2"c' _symmetry_Int_Tables_number 161 loop_ _symmetry_equiv_pos_as_xyz 'x, y, z' '-y, x-y, z' '-y, -x, z+1/2' '-x+y, -x, z' 'x, x-y, z+1/2' '-x+y, y, z+1/2' 'x+2/3, y+1/3, z+1/3' '-y+2/3, x-y+1/3, z+1/3' '-y+2/3, -x+1/3, z+5/6' '-x+y+2/3, -x+1/3, z+1/3' 'x+2/3, x-y+1/3, z+5/6' '-x+y+2/3, y+1/3, z+5/6' 'x+1/3, y+2/3, z+2/3' '-y+1/3, x-y+2/3, z+2/3' '-y+1/3, -x+2/3, z+7/6' '-x+y+1/3, -x+2/3, z+2/3' 'x+1/3, x-y+2/3, z+7/6' '-x+y+1/3, y+2/3, z+7/6' _cell_length_a 18.4508(7) _cell_length_b 18.4508(7) _cell_length_c 16.8934(7) _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 4980.6(3) _cell_formula_units_Z 6 _cell_measurement_temperature 173(2) _cell_measurement_reflns_used 3724 _cell_measurement_theta_min 3.705 _cell_measurement_theta_max 25.028 _cell_measurement_wavelength 0.71073 #----------------------------------------------------------------------------# # CRYSTAL INFORMATION # #----------------------------------------------------------------------------# _exptl_crystal_description prism _exptl_crystal_colour black _exptl_crystal_size_max 0.3 _exptl_crystal_size_mid 0.1 _exptl_crystal_size_min 0.1 _exptl_crystal_density_diffrn 1.314 _exptl_crystal_density_method 'not measured' _exptl_crystal_F_000 2052 _exptl_special_details ; ? ; #----------------------------------------------------------------------------# # ABSORPTION CORRECTION # #----------------------------------------------------------------------------# _exptl_absorpt_coefficient_mu 1.679 _exptl_absorpt_correction_type multi-scan _exptl_absorpt_process_details ; [c.f. r.h. blessing, acta cryst. (1995), a51, 33-38] ; _exptl_absorpt_correction_T_min 0.743 _exptl_absorpt_correction_T_max 0.792 #----------------------------------------------------------------------------# # DATA COLLECTION # #----------------------------------------------------------------------------# _diffrn_ambient_temperature 173(2) _diffrn_radiation_wavelength 0.71073 _diffrn_radiation_type MoK\a _diffrn_radiation_monochromator graphite _diffrn_radiation_probe x-ray _diffrn_measurement_device KappaCCD _diffrn_measurement_method CCD _diffrn_reflns_number 6300 _diffrn_reflns_av_R_equivalents 0.0367 _diffrn_reflns_av_sigmaI/netI 0.0358 _diffrn_reflns_limit_h_min -19 _diffrn_reflns_limit_h_max 21 _diffrn_reflns_limit_k_min -17 _diffrn_reflns_limit_k_max 21 _diffrn_reflns_limit_l_min -16 _diffrn_reflns_limit_l_max 20 _diffrn_reflns_theta_min 3.83 _diffrn_reflns_theta_max 25.02 _diffrn_reflns_theta_full 25.02 _diffrn_measured_fraction_theta_full 0.996 _diffrn_measured_fraction_theta_max 0.996 _reflns_number_total 1781 _reflns_number_gt 1693 _reflns_threshold_expression >2sigma(I) #----------------------------------------------------------------------------# # COMPUTER PROGRAMS USED # #----------------------------------------------------------------------------# _computing_cell_refinement 'HKL Scalepack (Otwinowski & Minor 1997)' _computing_data_reduction 'HKL Denzo and Scalepack (Otwinowski & Minor 1997)' _computing_structure_solution 'SHELXS-97 (Sheldrick, 1997)' _computing_structure_refinement 'SHELXL-97 (Sheldrick, 1997)' _computing_molecular_graphics 'Ortep-3 for Windows (Farrugia, 1997)' _computing_publication_material 'WinGX publication routines (Farrugia, 1999)' #----------------------------------------------------------------------------# # REFINEMENT INFORMATION # #----------------------------------------------------------------------------# _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^)+(0.0247P)^2^+4.8059P] 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_number_reflns 1781 _refine_ls_number_parameters 88 _refine_ls_number_restraints 1 _refine_ls_R_factor_all 0.025 _refine_ls_R_factor_gt 0.0231 _refine_ls_wR_factor_ref 0.0568 _refine_ls_wR_factor_gt 0.0558 _refine_ls_goodness_of_fit_ref 1.047 _refine_ls_restrained_S_all 1.046 _refine_ls_shift/su_max 0 _refine_ls_shift/su_mean 0 _refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881' _refine_ls_abs_structure_Flack -0.029(14) _refine_diff_density_max 0.621 _refine_diff_density_min -0.411 _refine_diff_density_rms 0.053 #----------------------------------------------------------------------------# # ATOMIC TYPES, COORDINATES AND THERMAL PARAMETERS # #----------------------------------------------------------------------------# 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 0 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' Ce Ce -0.2486 2.6331 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' Cl Cl 0.1484 0.1585 '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_ _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 Ce Ce 0 0 -0.14210(2) 0.02272(11) Uani 1 3 d S . . Cl Cl 0 0 -0.29585(12) 0.0393(4) Uani 1 3 d S . . Si1 Si -0.10259(6) -0.19151(8) -0.04581(6) 0.0233(3) Uani 1 1 d . . . Si2 Si 0.01100(5) -0.17568(5) -0.18270(7) 0.0250(2) Uani 1 1 d . . . N N -0.03216(16) -0.13126(16) -0.12048(16) 0.0214(5) Uani 1 1 d . . . C1 C -0.1422(2) -0.1277(2) 0.0047(2) 0.0371(9) Uani 1 1 d . . . H1A H -0.1679 -0.1084 -0.0345 0.056 Uiso 1 1 calc R . . H1B H -0.0955 -0.0793 0.0304 0.056 Uiso 1 1 calc R . . H1C H -0.1839 -0.1621 0.0445 0.056 Uiso 1 1 calc R . . C2 C -0.0558(2) -0.2237(2) 0.0344(2) 0.0343(8) Uani 1 1 d . . . H2A H -0.0077 -0.1739 0.0569 0.051 Uiso 1 1 calc R . . H2B H -0.0375 -0.2611 0.0128 0.051 Uiso 1 1 calc R . . H2C H -0.0976 -0.2529 0.0758 0.051 Uiso 1 1 calc R . . C3 C -0.1939(2) -0.2885(2) -0.0860(2) 0.0390(9) Uani 1 1 d . . . H3A H -0.2202 -0.2736 -0.1285 0.058 Uiso 1 1 calc R . . H3B H -0.2346 -0.3172 -0.0436 0.058 Uiso 1 1 calc R . . H3C H -0.1747 -0.3256 -0.1069 0.058 Uiso 1 1 calc R . . C4 C 0.1165(3) -0.0927(3) -0.2174(3) 0.0396(13) Uani 1 1 d . . . H4A H 0.1526 -0.0657 -0.1715 0.059 Uiso 1 1 calc R . . H4B H 0.1108 -0.0509 -0.2482 0.059 Uiso 1 1 calc R . . H4C H 0.1414 -0.1181 -0.2506 0.059 Uiso 1 1 calc R . . C5 C -0.0566(3) -0.2262(3) -0.2708(2) 0.0413(9) Uani 1 1 d . . . H5A H -0.0662 -0.1852 -0.2989 0.062 Uiso 1 1 calc R . . H5B H -0.1103 -0.2732 -0.2536 0.062 Uiso 1 1 calc R . . H5C H -0.0288 -0.2467 -0.3064 0.062 Uiso 1 1 calc R . . C6 C 0.0265(2) -0.2568(2) -0.1318(2) 0.0381(9) Uani 1 1 d . . . H6A H 0.0619 -0.2322 -0.085 0.057 Uiso 1 1 calc R . . H6B H 0.0538 -0.2772 -0.1681 0.057 Uiso 1 1 calc R . . H6C H -0.0279 -0.3035 -0.1156 0.057 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 Ce 0.02075(12) 0.02075(12) 0.02665(18) 0 0 0.01037(6) Cl 0.0445(7) 0.0445(7) 0.0290(9) 0 0 0.0222(4) Si1 0.0248(5) 0.0218(6) 0.0222(6) 0.0031(4) 0.0035(4) 0.0108(4) Si2 0.0263(5) 0.0248(5) 0.0227(4) -0.0027(4) 0.0009(4) 0.0119(4) N 0.0228(14) 0.0237(14) 0.0188(13) -0.0023(11) -0.0004(11) 0.0124(12) C1 0.053(2) 0.039(2) 0.0280(19) 0.0083(16) 0.0104(17) 0.030(2) C2 0.039(2) 0.034(2) 0.0306(19) 0.0089(16) 0.0053(16) 0.0188(18) C3 0.032(2) 0.031(2) 0.044(2) 0.0026(16) 0.0046(16) 0.0085(17) C4 0.037(2) 0.037(2) 0.039(3) -0.0017(19) 0.011(2) 0.015(2) C5 0.045(2) 0.047(2) 0.028(2) -0.0122(17) -0.0024(16) 0.0199(19) C6 0.047(2) 0.036(2) 0.040(2) -0.0033(18) 0.0073(19) 0.0271(19) #----------------------------------------------------------------------------# # MOLECULAR GEOMETRY # #----------------------------------------------------------------------------# _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 Ce N 2.217(3) 4 ? Ce N 2.217(3) . ? Ce N 2.217(3) 2 ? Ce Cl 2.597(2) . ? Ce Si2 3.4169(9) 2 ? Ce Si2 3.4170(9) . ? Ce Si2 3.4170(9) 4 ? Ce Si1 3.4678(13) 4 ? Ce Si1 3.4678(13) 2 ? Ce Si1 3.4679(13) . ? Si1 N 1.752(3) . ? Si1 C2 1.856(4) . ? Si1 C3 1.867(4) . ? Si1 C1 1.872(4) . ? Si2 N 1.750(3) . ? Si2 C6 1.868(4) . ? Si2 C5 1.865(4) . ? Si2 C4 1.870(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 N Ce N 117.34(4) 4 . ? N Ce N 117.34(4) 4 2 ? N Ce N 117.34(4) . 2 ? N Ce Cl 99.48(7) 4 . ? N Ce Cl 99.48(7) . . ? N Ce Cl 99.48(7) 2 . ? N Ce Si2 104.89(7) 4 2 ? N Ce Si2 137.32(7) . 2 ? N Ce Si2 26.76(7) 2 2 ? Cl Ce Si2 78.42(2) . 2 ? N Ce Si2 137.32(7) 4 . ? N Ce Si2 26.76(7) . . ? N Ce Si2 104.89(7) 2 . ? Cl Ce Si2 78.42(2) . . ? Si2 Ce Si2 116.075(15) 2 . ? N Ce Si2 26.76(7) 4 4 ? N Ce Si2 104.89(7) . 4 ? N Ce Si2 137.32(7) 2 4 ? Cl Ce Si2 78.42(2) . 4 ? Si2 Ce Si2 116.074(15) 2 4 ? Si2 Ce Si2 116.075(15) . 4 ? N Ce Si1 25.57(7) 4 4 ? N Ce Si1 125.30(7) . 4 ? N Ce Si1 95.30(7) 2 4 ? Cl Ce Si1 117.972(19) . 4 ? Si2 Ce Si1 90.76(2) 2 4 ? Si2 Ce Si1 151.72(2) . 4 ? Si2 Ce Si1 52.31(3) 4 4 ? N Ce Si1 125.30(7) 4 2 ? N Ce Si1 95.30(7) . 2 ? N Ce Si1 25.57(7) 2 2 ? Cl Ce Si1 117.972(19) . 2 ? Si2 Ce Si1 52.31(3) 2 2 ? Si2 Ce Si1 90.76(2) . 2 ? Si2 Ce Si1 151.72(2) 4 2 ? Si1 Ce Si1 99.79(2) 4 2 ? N Ce Si1 95.30(7) 4 . ? N Ce Si1 25.57(7) . . ? N Ce Si1 125.30(7) 2 . ? Cl Ce Si1 117.972(19) . . ? Si2 Ce Si1 151.72(2) 2 . ? Si2 Ce Si1 52.31(3) . . ? Si2 Ce Si1 90.76(2) 4 . ? Si1 Ce Si1 99.79(2) 4 . ? Si1 Ce Si1 99.79(2) 2 . ? N Si1 C2 114.35(15) . . ? N Si1 C3 111.96(17) . . ? C2 Si1 C3 107.44(18) . . ? N Si1 C1 109.13(15) . . ? C2 Si1 C1 104.97(18) . . ? C3 Si1 C1 108.64(17) . . ? N Si1 Ce 33.09(9) . . ? C2 Si1 Ce 124.33(12) . . ? C3 Si1 Ce 125.27(14) . . ? C1 Si1 Ce 76.05(12) . . ? N Si2 C6 112.73(15) . . ? N Si2 C5 111.50(16) . . ? C6 Si2 C5 107.41(18) . . ? N Si2 C4 109.63(18) . . ? C6 Si2 C4 106.6(2) . . ? C5 Si2 C4 108.7(2) . . ? N Si2 Ce 34.77(9) . . ? C6 Si2 Ce 140.62(12) . . ? C5 Si2 Ce 107.01(13) . . ? C4 Si2 Ce 79.49(17) . . ? Si1 N Si2 120.13(16) . . ? Si1 N Ce 121.35(14) . . ? Si2 N Ce 118.47(13) . . ?