Preparation and Characterization of Aluminum Alkoxides Coordinated on salen-Type Ligands: Highly Stereoselective Ring-Opening Polymerization ofrac-Lactide
Chen, Hsiao-Li; Dutta, Saikat; Huang, Pei-Ying; Lin, Chu-Chieh; Organometallics 31 (2012) 2016–; doi:10.1021/om201281w

data_4076522
_publ_section_title
;
 Preparation and Characterization of Aluminum Alkoxides Coordinated on
 salen-Type Ligands: Highly Stereoselective Ring-Opening Polymerization
 ofrac-Lactide
;
_journal_issue                   5
_journal_name_full               Organometallics
_journal_page_first              2016
_journal_paper_doi               10.1021/om201281w
_journal_volume                  31
_journal_year                    2012
_chemical_formula_sum            'C62 H67 Al N2 O3'
_chemical_formula_weight         915.15
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                93.665(2)
_cell_angle_beta                 103.910(2)
_cell_angle_gamma                91.174(2)
_cell_formula_units_Z            4
_cell_length_a                   12.3871(3)
_cell_length_b                   17.3272(4)
_cell_length_c                   24.7286(4)
_cell_measurement_reflns_used    16497
_cell_measurement_temperature    110(2)
_cell_measurement_theta_max      29.3063
_cell_measurement_theta_min      2.6685
_cell_volume                     5137.9(2)
_computing_cell_refinement       'Bruker FRAMBO'
_computing_data_collection       'Bruker FRAMBO'
_computing_data_reduction        'Bruker SHELXTL'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      110(2)
_diffrn_detector_area_resol_mean 16.0690
_diffrn_measured_fraction_theta_full 0.992
_diffrn_measured_fraction_theta_max 0.992
_diffrn_measurement_device_type  'Xcalibur, Sapphire3, Gemini'
_diffrn_measurement_method       '\w scans'
_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  0.0245
_diffrn_reflns_av_sigmaI/netI    0.0602
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_l_max       30
_diffrn_reflns_limit_l_min       -30
_diffrn_reflns_number            40555
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         26.00
_diffrn_reflns_theta_min         2.68
_exptl_absorpt_coefficient_mu    0.087
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.99582
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            coloress
_exptl_crystal_density_diffrn    1.183
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       parallelpiped
_exptl_crystal_F_000             1960
_exptl_crystal_size_max          0.45
_exptl_crystal_size_mid          0.4
_exptl_crystal_size_min          0.35
_refine_diff_density_max         0.461
_refine_diff_density_min         -0.264
_refine_diff_density_rms         0.039
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.001
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     1225
_refine_ls_number_reflns         20026
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.001
_refine_ls_R_factor_all          0.0699
_refine_ls_R_factor_gt           0.0391
_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^)+(0.0370P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0828
_refine_ls_wR_factor_ref         0.0865
_reflns_number_gt                12589
_reflns_number_total             20026
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om201281w_si_001.cif
_cod_data_source_block           1a
_cod_original_cell_volume        5137.88(19)
_cod_database_code               4076522