New [ONOO]-type amine bis(phenolate) ytterbium(II) and -(III) complexes: synthesis, structure, and catalysis for highly heteroselective polymerization of rac-lactide.
Yang, Sheng; Nie, Kun; Zhang, Yong; Xue, Mingqiang; Yao, Yingming; Shen, Qi; Inorganic chemistry 53 (2014) 105–115; doi:10.1021/ic401747n

data_4337532
_publ_section_title
;
 New [ONOO]-type amine bis(phenolate) ytterbium(II) and -(III) complexes:
 synthesis, structure, and catalysis for highly heteroselective
 polymerization of rac-lactide.
;
_journal_issue                   1
_journal_name_full               'Inorganic chemistry'
_journal_page_first              105
_journal_page_last               115
_journal_paper_doi               10.1021/ic401747n
_journal_volume                  53
_journal_year                    2014
_chemical_formula_moiety         'C35 H57 N3 O3 Yb, C7 H8'
_chemical_formula_sum            'C42 H65 N3 O3 Yb'
_chemical_formula_weight         833.01
_chemical_name_systematic
; 
 ? 
;
_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                 108.177(5)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   20.276(5)
_cell_length_b                   13.306(3)
_cell_length_c                   16.615(4)
_cell_measurement_reflns_used    19036
_cell_measurement_temperature    223(2)
_cell_measurement_theta_max      27.6
_cell_measurement_theta_min      3.0
_cell_volume                     4258.9(18)
_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 0.994
_diffrn_measured_fraction_theta_max 0.994
_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  0.0374
_diffrn_reflns_av_sigmaI/netI    0.0615
_diffrn_reflns_limit_h_max       24
_diffrn_reflns_limit_h_min       -21
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            20523
_diffrn_reflns_theta_full        25.50
_diffrn_reflns_theta_max         25.50
_diffrn_reflns_theta_min         3.00
_exptl_absorpt_coefficient_mu    2.234
_exptl_absorpt_correction_T_max  0.175
_exptl_absorpt_correction_T_min  0.159
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Jacobson, R. (1998) Private communication'
_exptl_crystal_colour            black
_exptl_crystal_density_diffrn    1.299
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1728
_exptl_crystal_size_max          0.65
_exptl_crystal_size_mid          0.60
_exptl_crystal_size_min          0.60
_refine_diff_density_max         2.230
_refine_diff_density_min         -1.299
_refine_diff_density_rms         0.159
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.086
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     429
_refine_ls_number_reflns         7876
_refine_ls_number_restraints     34
_refine_ls_restrained_S_all      1.087
_refine_ls_R_factor_all          0.0566
_refine_ls_R_factor_gt           0.0440
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0700P)^2^+1.6315P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1188
_refine_ls_wR_factor_ref         0.1303
_reflns_number_gt                6121
_reflns_number_total             7876
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ic401747n_si_001.cif
_cod_data_source_block           compound1
_cod_original_cell_volume        4258.7(17)
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               4337532