Polymerization ofrac-Lactide Using Schiff Base Aluminum Catalysts: Structure, Activity, and Stereoselectivity
Du, Hongzhi; Pang, Xuan; Yu, Haiyang; Zhuang, Xiuli; Chen, Xuesi; Cui, Dongmei; Wang, Xianhong; Jing, Xiabin; Macromolecules 40 (2007) 1904–; doi:10.1021/ma062194u

data_1505123
_publ_section_title
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 Polymerization ofrac-Lactide Using Schiff Base Aluminum
 Catalysts:&#x00A0; Structure, Activity, and Stereoselectivity
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_journal_issue                   6
_journal_name_full               Macromolecules
_journal_page_first              1904
_journal_paper_doi               10.1021/ma062194u
_journal_volume                  40
_journal_year                    2007
_chemical_formula_sum            'C22 H27 Al N2 O3'
_chemical_formula_weight         394.44
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_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                 94.0610(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.0321(9)
_cell_length_b                   10.2287(8)
_cell_length_c                   18.3383(15)
_cell_measurement_reflns_used    2263
_cell_measurement_temperature    187(2)
_cell_measurement_theta_max      23.01
_cell_measurement_theta_min      2.23
_cell_volume                     2064.2(3)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_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      187(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega 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  0.0361
_diffrn_reflns_av_sigmaI/netI    0.0453
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       5
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            11248
_diffrn_reflns_theta_full        26.06
_diffrn_reflns_theta_max         26.06
_diffrn_reflns_theta_min         1.85
_exptl_absorpt_coefficient_mu    0.123
_exptl_absorpt_correction_T_max  0.9891
_exptl_absorpt_correction_T_min  0.9604
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_density_diffrn    1.269
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             840
_exptl_crystal_size_max          0.33
_exptl_crystal_size_mid          0.16
_exptl_crystal_size_min          0.09
_refine_diff_density_max         0.501
_refine_diff_density_min         -0.503
_refine_diff_density_rms         0.061
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.025
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     117
_refine_ls_number_reflns         4073
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.025
_refine_ls_R_factor_all          0.0847
_refine_ls_R_factor_gt           0.0646
_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^)+(0.0616P)^2^+2.6996P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1478
_refine_ls_wR_factor_ref         0.1604
_reflns_number_gt                3127
_reflns_number_total             4073
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ma062194usi20060921_060511.cif
_cod_data_source_block           q227
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.1 from
2010-06-29.

'_exptl_absorpt_correction_type' value 'Multi-scan'
changed to 'multi-scan' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               1505123