Ring-Opening Polymerization of Lactides Catalyzed by Natural Amino-Acid Based Zinc Catalysts
Donald J. Darensbourg; Osit Karroonnirun; Inorganic Chemistry 49 (2010) 2360–2371; doi:10.1021/ic902271x

data_4315042
_publ_section_title
;
 Ring-Opening Polymerization of Lactides Catalyzed by Natural Amino-Acid
 Based Zinc Catalysts
;
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              2360
_journal_page_last               2371
_journal_paper_doi               10.1021/ic902271x
_journal_volume                  49
_journal_year                    2010
_chemical_formula_sum            'C55 H108 N6 O2 Si4 Zn2'
_chemical_formula_weight         1128.57
_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                90.000(5)
_cell_angle_beta                 99.190(5)
_cell_angle_gamma                90.000(5)
_cell_formula_units_Z            2
_cell_length_a                   13.530(5)
_cell_length_b                   23.298(5)
_cell_length_c                   10.488(5)
_cell_measurement_reflns_used    3311
_cell_measurement_temperature    110(2)
_cell_measurement_theta_max      58.89
_cell_measurement_theta_min      4.67
_cell_volume                     3264(2)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_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 0.974
_diffrn_measured_fraction_theta_max 0.974
_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  0.1202
_diffrn_reflns_av_sigmaI/netI    0.0991
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       25
_diffrn_reflns_limit_k_min       -26
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            22528
_diffrn_reflns_theta_full        23.47
_diffrn_reflns_theta_max         23.47
_diffrn_reflns_theta_min         1.52
_exptl_absorpt_coefficient_mu    0.848
_exptl_absorpt_correction_T_max  0.8623
_exptl_absorpt_correction_T_min  0.8353
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS; (Sheldrick, 2006)'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.148
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1224
_exptl_crystal_size_max          0.22
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.18
_refine_diff_density_max         0.784
_refine_diff_density_min         -1.130
_refine_diff_density_rms         0.195
_refine_ls_extinction_coef       0.040(3)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   0.965
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     337
_refine_ls_number_reflns         4681
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      0.966
_refine_ls_R_factor_all          0.1165
_refine_ls_R_factor_gt           0.0756
_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^)+(0.1651P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1935
_refine_ls_wR_factor_ref         0.2405
_reflns_number_gt                2847
_reflns_number_total             4681
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ic902271x_si_001_5.cif
_cod_data_source_block           znethylene
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to the built-in table from CIF Core dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1646 2011-03-28 12:23:43Z adriana 
;
_cod_database_code               4315042