Unusual alkali metal α- or β-phenyl(trimethylsilyl)amides
Antolini, Floria; Hitchcock, Peter B.; Lappert, Michael F.; Merle, Philippe; Chemical Communications  (2000) 1301–; doi:10.1039/b003169k

data_7110980
_publ_section_title
;
 Unusual alkali metal \a- or \b-phenyl(trimethylsilyl)amides
;
_journal_issue                   14
_journal_name_full               'Chemical Communications'
_journal_page_first              1301
_journal_paper_doi               10.1039/b003169k
_journal_year                    2000
_chemical_compound_source        'synthesis as described'
_chemical_formula_moiety         'C22 H40 Li2 N2 Si2'
_chemical_formula_structural     'C22 H40 LI2 N2 SI2'
_chemical_formula_sum            'C22 H40 Li2 N2 Si4'
_chemical_formula_weight         458.8
_chemical_name_common            '[{LiN(SiMe3)(SiMe2Ph)}2]'
_chemical_name_systematic
;
 ?
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      14
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_conform_dict_location
ftp://ftp.iucr.org/cifdics/cif_core_2.1beta5.dic
_audit_conform_dict_name         cif_core.dic
_audit_conform_dict_version      2.1beta5
_audit_creation_date             1999-10-15T09:48:33-00:00
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 98.6350(10)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   14.2980(3)
_cell_length_b                   13.6936(3)
_cell_length_c                   15.2530(3)
_cell_measurement_reflns_used    13499
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.878
_cell_measurement_theta_min      4.431
_cell_measurement_wavelength     0.71073
_cell_volume                     2952.55(11)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor 1997)'
_computing_data_reduction
'HKL Denzo and Scalepack (Otwinowski & Minor 1997)'
_computing_molecular_graphics    'Ortep-3 for Windows (Farrugia, 1997)'
_computing_publication_material  'WinGX publication routines (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.991
_diffrn_measurement_device       KappaCCD
_diffrn_measurement_method       CCD
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0421
_diffrn_reflns_av_sigmaI/netI    0.0379
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       -18
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            24486
_diffrn_reflns_theta_full        27.85
_diffrn_reflns_theta_max         27.85
_diffrn_reflns_theta_min         4.57
_exptl_absorpt_coefficient_mu    0.212
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.032
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             992
_exptl_crystal_size_max          0.4
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.328
_refine_diff_density_min         -0.336
_refine_diff_density_rms         0.041
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.021
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     271
_refine_ls_number_reflns         6948
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.021
_refine_ls_R_factor_all          0.0555
_refine_ls_R_factor_gt           0.0408
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0491P)^2^+1.1624P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.103
_refine_ls_wR_factor_ref         0.1129
_reflns_number_gt                5613
_reflns_number_total             6948
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b003169ksup1.cif
_cod_data_source_block           B003169K-1
_cod_original_sg_symbol_H-M      P2(1)/n
_cod_database_code               7110980