Zirconium complexes of bipyrrolidine derived salan ligands for the isoselective polymerisation of rac-lactide
Matthew D. Jones; Stuart L. Hancock; Paul McKeown; Pascal M. Schafer; Antoine Buchard; Lynne H. Thomas; Mary F. Mahon; John P. Lowe; Chem.Commun. 50 (2014) 15967–; doi:10.1039/C4cc07871C

data_7116132
_publ_section_title
;
 Zirconium complexes of bipyrrolidine derived salan ligands for the
 isoselective polymerisation of rac-lactide
;
_journal_name_full               Chem.Commun.
_journal_page_first              15967
_journal_paper_doi               10.1039/C4cc07871C
_journal_volume                  50
_journal_year                    2014
_chemical_absolute_configuration ad
_chemical_formula_sum            'C32 H48 N2 O4 Zr'
_chemical_formula_weight         615.94
_space_group_crystal_system      tetragonal
_space_group_IT_number           76
_space_group_name_Hall           'P 4w'
_space_group_name_H-M_alt        'P 41'
_symmetry_space_group_name_Hall  'P 4w'
_symmetry_space_group_name_H-M   'P 41'
_atom_sites_solution_hydrogens   geom
_audit_creation_date             2014-09-23T15:56:17-00:00
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   10.40580(10)
_cell_length_b                   10.40580(10)
_cell_length_c                   28.7670(2)
_cell_measurement_temperature    150(2)
_cell_volume                     3114.91(5)
_computing_structure_refinement  'SHELXL-2013 (Sheldrick, 2013)'
_diffrn_ambient_temperature      150(2)
_diffrn_detector                 'CCD plate'
_diffrn_detector_area_resol_mean 8.1150
_diffrn_detector_type            EosS2
_diffrn_measured_fraction_theta_full 1
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device       'four-circle diffractometer'
_diffrn_measurement_device_type  'SuperNova, Dual, Cu at zero, EosS2'
_diffrn_radiation_monochromator  mirror
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           'Cu K\a'
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_Laue_measured_fraction_full 1
_diffrn_reflns_Laue_measured_fraction_max 0.997
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       35
_diffrn_reflns_limit_l_min       -35
_diffrn_reflns_number            4868
_diffrn_reflns_point_group_measured_fraction_full 1
_diffrn_reflns_point_group_measured_fraction_max 0.99
_diffrn_reflns_theta_full        67.684
_diffrn_reflns_theta_max         71.855
_diffrn_reflns_theta_min         4.249
_diffrn_source                   'sealed X-ray tube'
_diffrn_source_type              'SuperNova (Cu) X-ray Source'
_exptl_absorpt_coefficient_mu    3.181
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.84777
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro, Agilent Technologies,
Version 1.171.37.33 (release 27-03-2014 CrysAlis171 .NET)
(compiled Mar 27 2014,17:12:48)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            'clear light colourless'
_exptl_crystal_density_diffrn    1.313
_exptl_crystal_description       irregular
_exptl_crystal_F_000             1304
_exptl_crystal_size_max          0.3000
_exptl_crystal_size_mid          0.2000
_exptl_crystal_size_min          0.2000
_refine_diff_density_max         1.239
_refine_diff_density_min         -1.438
_refine_diff_density_rms         0.13
_refine_ls_abs_structure_details
;
 Flack x determined using 1677 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons and Flack (2004), Acta Cryst. A60, s61).
;
_refine_ls_abs_structure_Flack   0.02(2)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.095
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     361
_refine_ls_number_reflns         4868
_refine_ls_number_restraints     13
_refine_ls_restrained_S_all      1.094
_refine_ls_R_factor_all          0.0703
_refine_ls_R_factor_gt           0.0703
_refine_ls_shift/su_max          0
_refine_ls_shift/su_mean         0
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.1534P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_ref         0.1914
_reflns_number_gt                4831
_reflns_number_total             4868
_reflns_threshold_expression     'I > 2\s(I)'
_twin_individual_twin_lattice_type pmt
_cod_data_source_file            c4cc07871c2.cif
_cod_data_source_block           Zr(1)(OiPr)2
_cod_original_cell_volume        3114.91(6)
_cod_database_code               7116132