Rare earth metal bis(silylamide) complexes bearing pyridyl-functionalized indenyl ligand: synthesis, structure and performance in the living polymerization of L-lactide and rac-lactide.
Wang, Yibin; Lei, Yinlin; Chi, Shuhui; Luo, Yunjie; Dalton transactions (Cambridge, England : 2003) 42 (2013) 1862–1871; doi:10.1039/c2dt32083e

data_7022229
_publ_section_title
;
 Rare earth metal bis(silylamide) complexes bearing pyridyl-functionalized
 indenyl ligand: synthesis, structure and performance in the living
 polymerization of L-lactide and rac-lactide.
;
_journal_issue                   5
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              1862
_journal_page_last               1871
_journal_paper_doi               10.1039/c2dt32083e
_journal_volume                  42
_journal_year                    2013
_chemical_formula_moiety         'C26 H46 Er N3 Si4'
_chemical_formula_sum            'C26 H46 Er N3 Si4'
_chemical_formula_weight         680.28
_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_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 92.130(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   17.3771(17)
_cell_length_b                   8.3270(7)
_cell_length_c                   22.582(3)
_cell_measurement_reflns_used    7928
_cell_measurement_temperature    223(2)
_cell_measurement_theta_max      27.5
_cell_measurement_theta_min      3.0
_cell_volume                     3265.3(6)
_computing_cell_refinement       CrystalClear
_computing_data_collection       CrystalClear
_computing_data_reduction        CrystalStructure
_computing_molecular_graphics    'Bruker XP'
_computing_publication_material  'Bruker SHELXTL'
_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 0.992
_diffrn_measured_fraction_theta_max 0.992
_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  0.0470
_diffrn_reflns_av_sigmaI/netI    0.0580
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       -21
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            16198
_diffrn_reflns_theta_full        25.50
_diffrn_reflns_theta_max         25.50
_diffrn_reflns_theta_min         3.01
_exptl_absorpt_coefficient_mu    2.735
_exptl_absorpt_correction_T_max  0.593
_exptl_absorpt_correction_T_min  0.291
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Jacobson, R. (1998) Private communication'
_exptl_crystal_colour            pink
_exptl_crystal_density_diffrn    1.384
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1388
_exptl_crystal_size_max          0.45
_exptl_crystal_size_mid          0.42
_exptl_crystal_size_min          0.20
_refine_diff_density_max         1.374
_refine_diff_density_min         -1.424
_refine_diff_density_rms         0.105
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.120
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     304
_refine_ls_number_reflns         6029
_refine_ls_number_restraints     9
_refine_ls_restrained_S_all      1.121
_refine_ls_R_factor_all          0.0619
_refine_ls_R_factor_gt           0.0520
_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^)+(0.0339P)^2^+6.2277P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1049
_refine_ls_wR_factor_ref         0.1098
_reflns_number_gt                5316
_reflns_number_total             6029
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2dt32083e.txt
_cod_data_source_block           shelxl3
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               7022229