Ring-Opening Polymerization of Lactides Initiated by Zinc Alkoxides Derived from NNO-Tridentate Ligands
Chen, Hsuan-Ying; Tang, Hui-Yi; Lin, Chu-Chieh; Macromolecules 39 (2006) 3745–3752; doi:10.1021/ma060471r

data_1505777
_publ_section_title
;
 Ring-Opening Polymerization of Lactides Initiated by Zinc Alkoxides
 Derived from NNO-Tridentate Ligands
;
_journal_coden_ASTM              MAMOBX
_journal_issue                   11
_journal_name_full               Macromolecules
_journal_page_first              3745
_journal_page_last               3752
_journal_paper_doi               10.1021/ma060471r
_journal_volume                  39
_journal_year                    2006
_chemical_formula_sum            'C30 H46 Br2 N4 O3 Zn2'
_chemical_formula_weight         801.27
_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
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 95.185(11)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.466(5)
_cell_length_b                   14.302(7)
_cell_length_c                   21.437(10)
_cell_measurement_reflns_used    2792
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      22.891
_cell_measurement_theta_min      2.535
_cell_volume                     3501(3)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_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      293(2)
_diffrn_measured_fraction_theta_full 0.988
_diffrn_measured_fraction_theta_max 0.988
_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  0.1753
_diffrn_reflns_av_sigmaI/netI    0.1678
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            19426
_diffrn_reflns_theta_full        26.08
_diffrn_reflns_theta_max         26.08
_diffrn_reflns_theta_min         1.71
_exptl_absorpt_coefficient_mu    3.687
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.1936
_exptl_absorpt_correction_type   SADABS
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.520
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       parallelpiped
_exptl_crystal_F_000             1632
_exptl_crystal_size_max          0.62
_exptl_crystal_size_mid          0.32
_exptl_crystal_size_min          0.25
_refine_diff_density_max         0.962
_refine_diff_density_min         -0.959
_refine_diff_density_rms         0.132
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.885
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     370
_refine_ls_number_reflns         6855
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.885
_refine_ls_R_factor_all          0.1824
_refine_ls_R_factor_gt           0.0754
_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^)+(0.1000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1745
_refine_ls_wR_factor_ref         0.2195
_reflns_number_gt                2608
_reflns_number_total             6855
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ma060471rsi20060302_085804.cif
_cod_data_source_block           1d
_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.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 

 Updated bibliographic information.

 Antanas Vaitkus,
 2019-10-09
;
_cod_original_sg_symbol_H-M      P2(1)/n
_cod_database_code               1505777