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_7116134
_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_IT_number           78
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  'P 4cw'
_symmetry_space_group_name_H-M   'P 43'
_atom_sites_solution_hydrogens   geom
_audit_creation_date             2014-09-30T16:28:05-00:00
_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                   10.4166(3)
_cell_length_b                   10.4166(3)
_cell_length_c                   28.8034(15)
_cell_measurement_reflns_used    3206
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      28.384
_cell_measurement_theta_min      4.146
_cell_volume                     3125.3(2)
_computing_cell_refinement
;
        CrysAlisPro, Agilent Technologies,
        Version 1.171.37.33 (release 27-03-2014 CrysAlis171 .NET)
        (compiled Mar 27 2014,17:12:48)
;
_computing_data_collection
;
        CrysAlisPro, Agilent Technologies,
        Version 1.171.37.33 (release 27-03-2014 CrysAlis171 .NET)
        (compiled Mar 27 2014,17:12:48)
;
_computing_data_reduction
;
        CrysAlisPro, Agilent Technologies,
        Version 1.171.37.33 (release 27-03-2014 CrysAlis171 .NET)
        (compiled Mar 27 2014,17:12:48)
;
_computing_structure_refinement  'SHELXL-2013 (Sheldrick, 2013)'
_diffrn_ambient_temperature      150(2)
_diffrn_detector_area_resol_mean 8.115
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'SuperNova, Dual, Cu at zero, EosS2'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  mirror
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0672
_diffrn_reflns_av_unetI/netI     0.0843
_diffrn_reflns_Laue_measured_fraction_full 0.997
_diffrn_reflns_Laue_measured_fraction_max 0.998
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       37
_diffrn_reflns_limit_l_min       -37
_diffrn_reflns_number            6303
_diffrn_reflns_point_group_measured_fraction_full 0.997
_diffrn_reflns_point_group_measured_fraction_max 0.997
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.483
_diffrn_reflns_theta_min         3.439
_diffrn_source                   'SuperNova (Mo) X-ray Source'
_exptl_absorpt_coefficient_mu    0.389
_exptl_absorpt_correction_T_max  1
_exptl_absorpt_correction_T_min  0.7856
_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    1.309
_exptl_crystal_description       trapezoid
_exptl_crystal_F_000             1304
_exptl_crystal_size_max          0.1
_exptl_crystal_size_mid          0.1
_exptl_crystal_size_min          0.1
_refine_diff_density_max         0.35
_refine_diff_density_min         -0.394
_refine_diff_density_rms         0.05
_refine_ls_abs_structure_details
;
 Flack x determined using 2353 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons and Flack (2004), Acta Cryst. A60, s61).
;
_refine_ls_abs_structure_Flack   -0.02(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.936
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     361
_refine_ls_number_reflns         6303
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.936
_refine_ls_R_factor_all          0.0412
_refine_ls_R_factor_gt           0.0391
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details     'w=1/[\s^2^(Fo^2^)] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_ref         0.0735
_reflns_number_gt                6089
_reflns_number_total             6303
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c4cc07871c2.cif
_cod_data_source_block           Zr(2)(OiPr)2
_cod_database_code               7116134