Ring-Opening Polymerization ofrac-Lactide by Bis(phenolate)amine-Supported Samarium Borohydride Complexes: An Experimental and DFT Study
Dyer, Hellen E.; Huijser, Saskia; Susperregui, Nicolas; Bonnet, Fanny; Schwarz, Andrew D.; Duchateau, Robbert; Maron, Laurent; Mountford, Philip; Organometallics 29 (2010) 3602–; doi:10.1021/om100513j

data_4066554
_publ_section_title
;
 Ring-Opening Polymerization ofrac-Lactide by
 Bis(phenolate)amine-Supported Samarium Borohydride Complexes: An
 Experimental and DFT Study
;
_journal_issue                   16
_journal_name_full               Organometallics
_journal_page_first              3602
_journal_paper_doi               10.1021/om100513j
_journal_volume                  29
_journal_year                    2010
_chemical_formula_moiety         'C103 H161 N3 O7 Sm2'
_chemical_formula_sum            'C103 H161 N3 O7 Sm2'
_chemical_formula_weight         1854.23
_chemical_name_systematic
;
Sm2(O2N_Pr)3(THF)
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90
_cell_angle_beta                 116.2237(4)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   17.61690(10)
_cell_length_b                   39.9745(3)
_cell_length_c                   19.44870(10)
_cell_measurement_reflns_used    22102
_cell_measurement_temperature    150
_cell_measurement_theta_max      26
_cell_measurement_theta_min      5
_cell_volume                     12286.61(14)
_computing_cell_refinement       'DENZO/SCALEPACK (Otwinowski & Minor, 1997)'
_computing_data_collection       'COLLECT (Nonius, 1997-2001).'
_computing_data_reduction        'DENZO/SCALEPACK (Otwinowski & Minor, 1997)'
_computing_molecular_graphics    'CAMERON (Watkin et al., 1996)'
_computing_publication_material  'CRYSTALS (Betteridge et al., 2003)'
_computing_structure_refinement  'CRYSTALS (Betteridge et al., 2003)'
_computing_structure_solution    'SIR92 (Altomare et al., 1994)'
_diffrn_ambient_temperature      150
_diffrn_measured_fraction_theta_full 0.974
_diffrn_measured_fraction_theta_max 0.971
_diffrn_measurement_device_type  'Nonius KappaCCD'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.000
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -21
_diffrn_reflns_limit_k_max       45
_diffrn_reflns_limit_k_min       -49
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            41967
_diffrn_reflns_theta_full        25.053
_diffrn_reflns_theta_max         26.372
_diffrn_reflns_theta_min         5.100
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.989
_exptl_absorpt_correction_T_max  0.98
_exptl_absorpt_correction_T_min  0.98
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'DENZO/SCALEPACK (Otwinowski & Minor, 1997)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.002
_exptl_crystal_description       plate
_exptl_crystal_F_000             3920
_exptl_crystal_size_max          0.10
_exptl_crystal_size_mid          0.02
_exptl_crystal_size_min          0.02
_refine_diff_density_max         1.14
_refine_diff_density_min         -0.62
_refine_ls_extinction_method     None
_refine_ls_goodness_of_fit_ref   1.0612
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     1036
_refine_ls_number_reflns         14932
_refine_ls_number_restraints     72
_refine_ls_R_factor_all          0.1150
_refine_ls_R_factor_gt           0.0647
_refine_ls_shift/su_max          0.002232
_refine_ls_structure_factor_coef F
_refine_ls_weighting_details
;
 Method, part 1, Chebychev polynomial, (Watkin, 1994, Prince, 1982) 
 [weight] = 1.0/[A~0~*T~0~(x)+A~1~*T~1~(x) ... +A~n-1~]*T~n-1~(x)] 
 where A~i~ are the Chebychev coefficients listed below and x= Fcalc/Fmax 
 Method = Robust Weighting (Prince, 1982) 
 W = [weight] * [1-(deltaF/6*sigmaF)^2^]^2^ 
 A~i~ are: 
 1.18 0.782 1.01 0.246 0.195 
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.0964
_refine_ls_wR_factor_gt          0.0636
_refine_ls_wR_factor_ref         0.0636
_reflns_limit_h_max              19
_reflns_limit_h_min              -21
_reflns_limit_k_max              49
_reflns_limit_k_min              0
_reflns_limit_l_max              24
_reflns_limit_l_min              0
_reflns_number_gt                14932
_reflns_number_total             24409
_reflns_threshold_expression     I>3.0\s(I)
_oxford_diffrn_Wilson_B_factor   2.17
_oxford_diffrn_Wilson_scale      325.08
_oxford_refine_ls_scale          0.08218(10)
_cod_data_source_file            om100513j_si_002.cif
_cod_data_source_block           COMPOUND_10
_cod_original_sg_symbol_H-M      'P 1 21/n 1 '
_cod_database_code               4066554