Chiral Rare Earth Borohydride Complexes Supported by Amidinate Ligands: Synthesis, Structure, and Catalytic Activity in the Ring-Opening Polymerization ofrac-Lactide
Kratsch, Jochen; Kuzdrowska, Magdalena; Schmid, Matthias; Kazeminejad, Neda; Kaub, Christoph; Oña-Burgos, Pascual; Guillaume, Sophie M.; Roesky, Peter W.; Organometallics 32 (2013) 1230–; doi:10.1021/om301011v

data_4080202
_publ_section_title
;
 Chiral Rare Earth Borohydride Complexes Supported by Amidinate Ligands:
 Synthesis, Structure, and Catalytic Activity in the Ring-Opening
 Polymerization ofrac-Lactide
;
_journal_issue                   5
_journal_name_full               Organometallics
_journal_page_first              1230
_journal_paper_doi               10.1021/om301011v
_journal_volume                  32
_journal_year                    2013
_chemical_absolute_configuration rmad
_chemical_formula_moiety         'C31 H47 B2 N2 O2 Yb'
_chemical_formula_sum            'C31 H47 B2 N2 O2 Yb'
_chemical_formula_weight         674.37
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           5
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'C 2y'
_symmetry_space_group_name_H-M   'C 1 2 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                 118.16(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   13.256(3)
_cell_length_b                   12.600(3)
_cell_length_c                   10.874(2)
_cell_measurement_reflns_used    17930
_cell_measurement_temperature    200(2)
_cell_measurement_theta_max      29.59
_cell_measurement_theta_min      2.12
_cell_volume                     1601.3(8)
_computing_cell_refinement       'STOE X-AREA, PLATON (A.L.Spek, 2005)'
_computing_data_collection       'STOE X-AREA'
_computing_data_reduction        'STOE X-RED, PLATON (A.L.Spek, 2005)'
_computing_molecular_graphics    'Diamond 3.2g'
_computing_publication_material  'WinGX, Microsoft Word'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      200(2)
_diffrn_detector_area_resol_mean 6.67
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'STOE IPDS 2'
_diffrn_measurement_method       'area detector'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0576
_diffrn_reflns_av_sigmaI/netI    0.0382
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -18
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            9473
_diffrn_reflns_theta_full        29.15
_diffrn_reflns_theta_max         29.15
_diffrn_reflns_theta_min         2.12
_exptl_absorpt_coefficient_mu    2.948
_exptl_absorpt_correction_T_max  0.7543
_exptl_absorpt_correction_T_min  0.6445
_exptl_absorpt_correction_type   integration
_exptl_absorpt_process_details   'STOE X-RED & X-SHAPE'
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    1.399
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             686
_exptl_crystal_size_max          0.272
_exptl_crystal_size_mid          0.233
_exptl_crystal_size_min          0.183
_refine_diff_density_max         0.859
_refine_diff_density_min         -0.448
_refine_diff_density_rms         0.079
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.018(10)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.052
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     174
_refine_ls_number_reflns         4318
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.052
_refine_ls_R_factor_all          0.0235
_refine_ls_R_factor_gt           0.0235
_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^)+(0.0352P)^2^+1.2086P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0590
_refine_ls_wR_factor_ref         0.0590
_reflns_number_gt                4318
_reflns_number_total             4318
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om301011v_si_002.cif
_cod_data_source_block           5
_cod_original_cell_volume        1601.2(6)
_cod_original_sg_symbol_H-M      'C 2'
_cod_database_code               4080202