Reactions of Hypersilyl Potassium with Rare-Earth Metal Bis(Trimethylsilylamides): Addition versus Peripheral Deprotonation
Niemeyer, Mark; Inorganic Chemistry 45 (2006) 9085–9095; doi:10.1021/ic0613659

data_4333081
_publ_section_title
;
 Reactions of Hypersilyl Potassium with Rare-Earth Metal
 Bis(Trimethylsilylamides):&#x00A0; Addition versus Peripheral
 Deprotonation
;
_journal_issue                   22
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              9085
_journal_page_last               9095
_journal_paper_doi               10.1021/ic0613659
_journal_volume                  45
_journal_year                    2006
_chemical_formula_sum            'C18 H54 Li N3 Si6 Yb'
_chemical_formula_weight         661.16
_chemical_name_systematic
; 
lithium-tris{bis(trimethylsilylamido)}ytterbate(II)
;
_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-97
_cell_angle_alpha                96.46(2)
_cell_angle_beta                 95.80(2)
_cell_angle_gamma                102.32(2)
_cell_formula_units_Z            2
_cell_length_a                   8.850(2)
_cell_length_b                   11.720(3)
_cell_length_c                   16.363(4)
_cell_measurement_temperature    173(2)
_cell_volume                     1633.9(7)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Siemens P4'
_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  0.0406
_diffrn_reflns_av_sigmaI/netI    0.0520
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -4
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            7967
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         27.50
_diffrn_reflns_theta_min         2.05
_diffrn_standards_interval_count 298
_diffrn_standards_number         2
_exptl_absorpt_coefficient_mu    3.092
_exptl_absorpt_correction_T_max  0.4573
_exptl_absorpt_correction_T_min  0.3710
_exptl_absorpt_correction_type   psi-scan
_exptl_crystal_colour            orange-red
_exptl_crystal_density_diffrn    1.344
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             680
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.35
_exptl_crystal_size_min          0.30
_refine_diff_density_max         1.177
_refine_diff_density_min         -1.135
_refine_diff_density_rms         0.113
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.963
_refine_ls_hydrogen_treatment    refU
_refine_ls_matrix_type           full
_refine_ls_number_parameters     281
_refine_ls_number_reflns         7483
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.963
_refine_ls_R_factor_all          0.0426
_refine_ls_R_factor_gt           0.0331
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0435P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0798
_refine_ls_wR_factor_ref         0.0818
_reflns_number_gt                6148
_reflns_number_total             7483
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ic0613659sup1.cif
_cod_data_source_block           7
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               4333081