Ring-Opening Polymerization of Cyclic Monomers by Complexes Derived from Biocompatible Metals. Production of Poly(lactide), Poly(trimethylene carbonate), and Their Copolymers
Darensbourg, Donald J.; Choi, Wonsook; Karroonnirun, Osit; Bhuvanesh, Nattamai; Macromolecules 41 (2008) 3493–; doi:10.1021/ma800078t

data_1504431
_publ_section_title
;
 Ring-Opening Polymerization of Cyclic Monomers by Complexes Derived from
 Biocompatible Metals. Production of Poly(lactide), Poly(trimethylene
 carbonate), and Their Copolymers
;
_journal_issue                   10
_journal_name_full               Macromolecules
_journal_page_first              3493
_journal_paper_doi               10.1021/ma800078t
_journal_volume                  41
_journal_year                    2008
_chemical_formula_sum            'C35 H63 Ca N3 O2 Si2'
_chemical_formula_weight         654.14
_space_group_IT_number           9
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'C -2yc'
_symmetry_space_group_name_H-M   'C 1 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                 94.427(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   21.7989(11)
_cell_length_b                   10.4434(6)
_cell_length_c                   17.3961(10)
_cell_measurement_reflns_used    6652
_cell_measurement_temperature    110(2)
_cell_measurement_theta_max      61.04
_cell_measurement_theta_min      4.07
_cell_volume                     3948.5(4)
_computing_cell_refinement
; 
  CELL-NOW (Sheldrick, 2003) and SAINT (BRUKER-NONIUS, 2003) 
;
_computing_data_collection       'FRAMBO (BRUKER-NONIUS, 2003)'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'X-SEED (Barbour, 2001)'
_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_measured_fraction_theta_full 0.987
_diffrn_measured_fraction_theta_max 0.987
_diffrn_measurement_device_type  'BRUKER GADDS D8 Discover'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0383
_diffrn_reflns_av_sigmaI/netI    0.0448
_diffrn_reflns_limit_h_max       24
_diffrn_reflns_limit_h_min       -24
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            14964
_diffrn_reflns_theta_full        61.09
_diffrn_reflns_theta_max         61.09
_diffrn_reflns_theta_min         4.07
_exptl_absorpt_coefficient_mu    2.184
_exptl_absorpt_correction_T_max  0.9177
_exptl_absorpt_correction_T_min  0.6570
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS; (Sheldrick, 2006)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.100
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1432
_exptl_crystal_size_max          0.21
_exptl_crystal_size_mid          0.17
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.240
_refine_diff_density_min         -0.212
_refine_diff_density_rms         0.035
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.018(6)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.015
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     402
_refine_ls_number_reflns         5516
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.014
_refine_ls_R_factor_all          0.0322
_refine_ls_R_factor_gt           0.0282
_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^)+(0.0403P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0679
_refine_ls_wR_factor_ref         0.0706
_reflns_number_gt                5046
_reflns_number_total             5516
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ma800078t-file003.cif
_cod_data_source_block           sad
_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 
;
_cod_original_sg_symbol_H-M      Cc
_cod_database_code               1504431