Synthesis and structures of some new types of lithium β-diketiminates
Wei, Xue-Hong; Farwell, James D.; Hitchcock, Peter B.; Lappert, Michael F.; Dalton Transactions  (2008) 1073–1080; doi:10.1039/b716888h

data_7003527
_publ_section_title
;
 Synthesis and structures of some new types of lithium \b-diketiminates
;
_journal_issue                   8
_journal_name_full               'Dalton Transactions'
_journal_page_first              1073
_journal_page_last               1080
_journal_paper_doi               10.1039/b716888h
_journal_year                    2008
_chemical_compound_source        'synthesis as described'
_chemical_formula_moiety         'C48 H84 Li2 N8 Si4'
_chemical_formula_sum            'C48 H84 Li2 N8 Si4'
_chemical_formula_weight         899.47
_chemical_name_common
;
((tmeda)Li(Me3SiNCPhCHC(NSiMe3)C6H4C(NSiMe3)NCPhCHSiMe3)Li(tmeda))
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      14
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_conform_dict_location     ftp://ftp.iucr.org/pub/cif_core.dic
_audit_conform_dict_name         cif_core.dic
_audit_conform_dict_version      2.2
_audit_creation_date             2007-08-17T12:01:15-00:00
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 98.2150(10)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   18.5001(3)
_cell_length_b                   14.7798(3)
_cell_length_c                   21.7209(5)
_cell_measurement_reflns_used    17921
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      22.986
_cell_measurement_theta_min      3.705
_cell_measurement_wavelength     0.71073
_cell_volume                     5878.2(2)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor 1997)'
_computing_data_collection       'Collect (Nonius BV, 1997-2000)'
_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 0.983
_diffrn_measured_fraction_theta_max 0.983
_diffrn_measurement_device       '95mm CCD camera on \k-goniostat'
_diffrn_measurement_device_type  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  0.0618
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            27808
_diffrn_reflns_theta_full        23.03
_diffrn_reflns_theta_max         23.03
_diffrn_reflns_theta_min         3.75
_exptl_absorpt_coefficient_mu    0.136
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.016
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             1960
_exptl_crystal_size_max          0.4
_exptl_crystal_size_mid          0.4
_exptl_crystal_size_min          0.4
_refine_diff_density_max         0.462
_refine_diff_density_min         -0.334
_refine_diff_density_rms         0.044
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.026
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     563
_refine_ls_number_reflns         8053
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.026
_refine_ls_R_factor_all          0.0819
_refine_ls_R_factor_gt           0.0605
_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^)+(0.0592P)^2^+6.7885P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1424
_refine_ls_wR_factor_ref         0.1577
_reflns_number_gt                6243
_reflns_number_total             8053
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b716888h.txt
_cod_data_source_block           (9)-dec102
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               7003527