Preparation and structures of enantiomeric dinuclear zirconium and hafnium complexes containing two homochiral N atoms, and their catalytic property for polymerization of rac-lactide.
Hu, Minggang; Wang, Mei; Zhu, Hongjun; Zhang, Lu; Zhang, Hui; Sun, Licheng; Dalton transactions (Cambridge, England : 2003) 39 (2010) 4440–4446; doi:10.1039/c001148g

data_7025487
_publ_section_title
;
 Preparation and structures of enantiomeric dinuclear zirconium and
 hafnium complexes containing two homochiral N atoms, and their catalytic
 property for polymerization of rac-lactide.
;
_journal_issue                   18
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              4440
_journal_page_last               4446
_journal_paper_doi               10.1039/c001148g
_journal_volume                  39
_journal_year                    2010
_chemical_formula_sum            'C27 H34 N2 O2'
_chemical_formula_weight         418.56
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_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            8
_cell_length_a                   10.309(4)
_cell_length_b                   19.877(7)
_cell_length_c                   23.543(8)
_cell_measurement_temperature    298(2)
_cell_volume                     4824(3)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      298(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_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  0.0738
_diffrn_reflns_av_sigmaI/netI    0.0531
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       24
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -28
_diffrn_reflns_number            30162
_diffrn_reflns_theta_full        25.50
_diffrn_reflns_theta_max         25.50
_diffrn_reflns_theta_min         2.05
_exptl_absorpt_coefficient_mu    0.072
_exptl_absorpt_correction_T_max  0.793
_exptl_absorpt_correction_T_min  0.572
_exptl_absorpt_correction_type   empirical
_exptl_crystal_density_diffrn    1.153
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             1808
_exptl_crystal_size_max          0.88
_exptl_crystal_size_mid          0.52
_exptl_crystal_size_min          0.28
_refine_diff_density_max         0.216
_refine_diff_density_min         -0.278
_refine_diff_density_rms         0.048
_refine_ls_extinction_coef       0.00071(14)
_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   1.009
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     312
_refine_ls_number_reflns         4489
_refine_ls_number_restraints     42
_refine_ls_restrained_S_all      1.011
_refine_ls_R_factor_all          0.1676
_refine_ls_R_factor_gt           0.0641
_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^)+(0.0101P)^2^+6.8250P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1204
_refine_ls_wR_factor_ref         0.1411
_reflns_number_gt                2161
_reflns_number_total             4489
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c001148g.txt
_cod_data_source_block           H2L
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1891 2012-01-12 08:04:46Z andrius 
;
_cod_original_sg_symbol_H-M      Pbca
_cod_database_code               7025487