Synthesis and characterization of anionic rare-earth metal amides stabilized by phenoxy-amido ligands and their catalytic behavior for the polymerization of lactide.
Lu, Min; Yao, Yingming; Zhang, Yong; Shen, Qi; Dalton transactions (Cambridge, England : 2003) 39 (2010) 9530–9537; doi:10.1039/c0dt00025f

data_7008877
_publ_section_title
;
 Synthesis and characterization of anionic rare-earth metal amides
 stabilized by phenoxy-amido ligands and their catalytic behavior for the
 polymerization of lactide.
;
_journal_issue                   40
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              9530
_journal_page_last               9537
_journal_paper_doi               10.1039/c0dt00025f
_journal_volume                  39
_journal_year                    2010
_chemical_absolute_configuration unk
_chemical_formula_moiety         'C58 H92 Li2 N3 O4 Si2 Y'
_chemical_formula_sum            'C58 H92 Li2 N3 O4 Si2 Y'
_chemical_formula_weight         1054.32
_space_group_IT_number           110
_symmetry_cell_setting           tetragonal
_symmetry_Int_Tables_number      110
_symmetry_space_group_name_Hall  'I 4bw -2c'
_symmetry_space_group_name_H-M   'I 41 c d'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   21.5684(13)
_cell_length_b                   21.5684(13)
_cell_length_c                   26.5034(16)
_cell_measurement_reflns_used    13261
_cell_measurement_temperature    223(2)
_cell_measurement_theta_max      27.5
_cell_measurement_theta_min      3.1
_cell_volume                     12329.3(13)
_computing_cell_refinement       CrystalClear
_computing_data_collection       CrystalClear
_computing_data_reduction        CrystalStructure
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      223(2)
_diffrn_detector_area_resol_mean 14.63
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device_type  'Rigaku Saturn'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71075
_diffrn_reflns_av_R_equivalents  0.0436
_diffrn_reflns_av_sigmaI/netI    0.0635
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       -28
_diffrn_reflns_limit_k_max       22
_diffrn_reflns_limit_k_min       -25
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -34
_diffrn_reflns_number            17958
_diffrn_reflns_theta_full        27.47
_diffrn_reflns_theta_max         27.47
_diffrn_reflns_theta_min         3.13
_exptl_absorpt_coefficient_mu    1.028
_exptl_absorpt_correction_T_max  0.663
_exptl_absorpt_correction_T_min  0.403
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Jacobson, R. (1998) Private communication'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.136
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             4528
_exptl_crystal_size_max          0.60
_exptl_crystal_size_mid          0.55
_exptl_crystal_size_min          0.40
_refine_diff_density_max         0.381
_refine_diff_density_min         -0.406
_refine_diff_density_rms         0.047
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.025(11)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.037
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     316
_refine_ls_number_reflns         5997
_refine_ls_number_restraints     3
_refine_ls_restrained_S_all      1.056
_refine_ls_R_factor_all          0.0705
_refine_ls_R_factor_gt           0.0501
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0471P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1116
_refine_ls_wR_factor_ref         0.1214
_reflns_number_gt                4479
_reflns_number_total             5997
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            C0DT00025F.TXT
_cod_data_source_block           complex5
_cod_database_code               7008877