Ring-opening polymerization of l-lactide catalyzed by calcium complexes.
Hsiao, Mon-Wei; Lin, Chu-Chieh; Dalton transactions (Cambridge, England : 2003) 42 (2013) 2041–2051; doi:10.1039/c2dt32487c

data_7020916
_publ_section_title
;
 Ring-opening polymerization of l-lactide catalyzed by calcium complexes.
;
_journal_issue                   6
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              2041
_journal_page_last               2051
_journal_paper_doi               10.1039/c2dt32487c
_journal_volume                  42
_journal_year                    2013
_chemical_formula_moiety         'C25 H16 Ca N4 O4'
_chemical_formula_sum            'C25 H16 Ca N4 O4'
_chemical_formula_weight         477.40
_chemical_name_systematic
;
?
;
_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                 92.412(12)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.0497(10)
_cell_length_b                   16.055(3)
_cell_length_c                   19.540(3)
_cell_measurement_reflns_used    1424
_cell_measurement_temperature    114(3)
_cell_measurement_theta_max      29.1254
_cell_measurement_theta_min      2.6387
_cell_volume                     3149.9(8)
_computing_cell_refinement
;
CrysAlisPro, Agilent Technologies,
Version 1.171.35.19 (release 27-10-2011 CrysAlis171 .NET)
(compiled Oct 27 2011,15:02:11)
;
_computing_data_collection
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CrysAlisPro, Agilent Technologies,
Version 1.171.35.19 (release 27-10-2011 CrysAlis171 .NET)
(compiled Oct 27 2011,15:02:11)
;
_computing_data_reduction
;
CrysAlisPro, Agilent Technologies,
Version 1.171.35.19 (release 27-10-2011 CrysAlis171 .NET)
(compiled Oct 27 2011,15:02:11)
;
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      114(3)
_diffrn_detector_area_resol_mean 16.0690
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Xcalibur, Sapphire3, Gemini'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Enhance (Mo) X-ray Source'
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.7107
_diffrn_reflns_av_R_equivalents  0.1155
_diffrn_reflns_av_sigmaI/netI    0.2263
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            16062
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         26.00
_diffrn_reflns_theta_min         2.64
_exptl_absorpt_coefficient_mu    0.228
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.91980
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro, Agilent Technologies,
Version 1.171.35.19 (release 27-10-2011 CrysAlis171 .NET)
(compiled Oct 27 2011,15:02:11)
Empirical absorption correction using spherical harmonics,
implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.007
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             986
_exptl_crystal_size_max          0.3
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.2
_platon_squeeze_details
;
;
_refine_diff_density_max         0.517
_refine_diff_density_min         -0.355
_refine_diff_density_rms         0.093
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.027
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     327
_refine_ls_number_reflns         6171
_refine_ls_number_restraints     5
_refine_ls_restrained_S_all      1.029
_refine_ls_R_factor_all          0.1743
_refine_ls_R_factor_gt           0.0987
_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^)+(0.0728P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2263
_refine_ls_wR_factor_ref         0.2538
_reflns_number_gt                2509
_reflns_number_total             6171
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2dt32487c.txt
_cod_data_source_block           1a
_cod_original_cell_volume        3150.0(8)
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               7020916