Metalloenzyme inspired dizinc catalyst for the polymerization of lactide
Williams, Charlotte K.; Brooks, Neil R.; Hillmyer, Marc A.; Tolman, William B.; Chemical Communications  (2002) 2132–; doi:10.1039/b206437e

data_7114046
_publ_section_title
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 Metalloenzyme inspired dizinc catalyst for the polymerization of lactide
;
_journal_issue                   18
_journal_name_full               'Chemical Communications'
_journal_page_first              2132
_journal_paper_doi               10.1039/b206437e
_journal_year                    2002
_chemical_formula_moiety         'C21 H40 Cl2 N4 O2 Zn2, C4 H8 O'
_chemical_formula_sum            'C25 H48 Cl2 N4 O3 Zn2'
_chemical_formula_weight         654.31
_chemical_name_common            02080
_chemical_name_systematic
; 
? 
;
_space_group_IT_number           29
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2ac'
_symmetry_space_group_name_H-M   'P c a 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   17.3944(17)
_cell_length_b                   14.6134(14)
_cell_length_c                   11.9982(12)
_cell_measurement_reflns_used    2998
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      24.97
_cell_measurement_theta_min      2.34
_cell_volume                     3049.8(5)
_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
_computing_structure_solution    SHELXS-97
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker 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  0.0354
_diffrn_reflns_av_sigmaI/netI    0.0474
_diffrn_reflns_limit_h_max       19
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            15361
_diffrn_reflns_theta_full        25.05
_diffrn_reflns_theta_max         25.05
_diffrn_reflns_theta_min         1.39
_diffrn_standards_decay_%        none
_exptl_absorpt_coefficient_mu    1.780
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.715
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS 2.03 (Sheldrick, 2000)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.425
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Needle
_exptl_crystal_F_000             1376
_exptl_crystal_size_max          0.32
_exptl_crystal_size_mid          0.14
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.986
_refine_diff_density_min         -0.596
_refine_diff_density_rms         0.099
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.165(17)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.049
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     326
_refine_ls_number_reflns         5355
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.049
_refine_ls_R_factor_all          0.0552
_refine_ls_R_factor_gt           0.0437
_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^)+(0.0872P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1212
_refine_ls_wR_factor_ref         0.1269
_reflns_number_gt                4507
_reflns_number_total             5355
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b206437e.txt
_cod_data_source_block           02080
_cod_depositor_comments
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The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/usr/data/users/saulius/automatic-downloads/retrospective/RSC/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2281 2013-09-26 08:29:07Z andrius 

The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not measured' was changed to '?'
- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_original_sg_symbol_H-M      Pca2(1)
_cod_database_code               7114046