Synthesis and Characterization of the Monomeric Vicinal Dianion Li~2~(THF)~3~[ArNC(SiMe~3~)~2~] and the Aluminum and Lithium Derivatives of the Amido Ligand [ArNCH(SiMe~3~)~2~]^-^
Cheng, Xiaoyan; Zhang, Jianying; Song, Haibin; Cui, Chunming; Organometallics 27 (2008) 678–682; doi:10.1021/om700972a

data_4070737
_publ_section_title
;
 Synthesis and Characterization of the Monomeric Vicinal Dianion
 Li~2~(THF)~3~[ArNC(SiMe~3~)~2~] and the Aluminum and Lithium Derivatives
 of the Amido Ligand [ArNCH(SiMe~3~)~2~]^-^
;
_journal_coden_ASTM              ORGND7
_journal_issue                   4
_journal_name_full               Organometallics
_journal_page_first              678
_journal_page_last               682
_journal_paper_doi               10.1021/om700972a
_journal_volume                  27
_journal_year                    2008
_chemical_formula_moiety         'C23 H44 Al I2 N O Si2'
_chemical_formula_sum            'C23 H44 Al I2 N O Si2'
_chemical_formula_weight         687.55
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_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_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 99.981(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.4567(6)
_cell_length_b                   14.0978(8)
_cell_length_c                   20.6210(14)
_cell_measurement_reflns_used    8251
_cell_measurement_temperature    113(2)
_cell_measurement_theta_max      27.9
_cell_measurement_theta_min      1.8
_cell_volume                     2993.9(3)
_computing_cell_refinement       CrystalClear
_computing_data_collection       CrystalClear
_computing_data_reduction        CrystalClear
_computing_publication_material  'CrystalStructure 3.7.0'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      113(2)
_diffrn_detector_area_resol_mean 7.31
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Rigaku Saturn'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  confocal
_diffrn_radiation_source         'Rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71070
_diffrn_reflns_av_R_equivalents  0.0386
_diffrn_reflns_av_sigmaI/netI    0.0385
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            22851
_diffrn_reflns_theta_full        27.89
_diffrn_reflns_theta_max         27.89
_diffrn_reflns_theta_min         1.76
_exptl_absorpt_coefficient_mu    2.225
_exptl_absorpt_correction_T_max  0.6646
_exptl_absorpt_correction_T_min  0.6646
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Jacobson, R. (1998) Private communication'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.525
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             1376
_exptl_crystal_size_max          0.22
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.18
_refine_diff_density_max         1.000
_refine_diff_density_min         -1.325
_refine_diff_density_rms         0.104
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.011
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     282
_refine_ls_number_reflns         7136
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.011
_refine_ls_R_factor_all          0.0341
_refine_ls_R_factor_gt           0.0282
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0344P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0636
_refine_ls_wR_factor_ref         0.0662
_reflns_number_gt                6127
_reflns_number_total             7136
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om700972a-file005.cif
_cod_data_source_block           shelxl
_cod_database_code               4070737