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_4080200
_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 Nd O2'
_chemical_formula_sum            'C31 H47 B2 N2 Nd O2'
_chemical_formula_weight         645.57
_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                 116.91(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   13.223(3)
_cell_length_b                   12.679(3)
_cell_length_c                   10.765(2)
_cell_measurement_reflns_used    23980
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.17
_cell_measurement_theta_min      2.13
_cell_volume                     1609.4(7)
_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      173(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_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  0.1488
_diffrn_reflns_av_sigmaI/netI    0.0710
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            23264
_diffrn_reflns_theta_full        26.74
_diffrn_reflns_theta_max         26.74
_diffrn_reflns_theta_min         2.12
_exptl_absorpt_coefficient_mu    1.641
_exptl_absorpt_correction_T_max  0.9032
_exptl_absorpt_correction_T_min  0.7668
_exptl_absorpt_correction_type   integration
_exptl_absorpt_process_details   'STOE X-RED & X-SHAPE'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.332
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       fragment
_exptl_crystal_F_000             666
_exptl_crystal_size_max          0.159
_exptl_crystal_size_mid          0.124
_exptl_crystal_size_min          0.080
_refine_diff_density_max         1.520
_refine_diff_density_min         -0.601
_refine_diff_density_rms         0.088
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.010(18)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.015
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     190
_refine_ls_number_reflns         3424
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.015
_refine_ls_R_factor_all          0.0339
_refine_ls_R_factor_gt           0.0338
_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^)+(0.0247P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0713
_refine_ls_wR_factor_ref         0.0714
_reflns_number_gt                3419
_reflns_number_total             3424
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om301011v_si_002.cif
_cod_data_source_block           3
_cod_original_cell_volume        1609.3(6)
_cod_original_sg_symbol_H-M      'C 2'
_cod_database_code               4080200